JPH0689370B2 - Method for producing sintered product by plastic molding of powder - Google Patents
Method for producing sintered product by plastic molding of powderInfo
- Publication number
- JPH0689370B2 JPH0689370B2 JP1128261A JP12826189A JPH0689370B2 JP H0689370 B2 JPH0689370 B2 JP H0689370B2 JP 1128261 A JP1128261 A JP 1128261A JP 12826189 A JP12826189 A JP 12826189A JP H0689370 B2 JPH0689370 B2 JP H0689370B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- powder
- organic binder
- polyethylene oxide
- plastic molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000843 powder Substances 0.000 title claims description 23
- 238000010137 moulding (plastic) Methods 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000011230 binding agent Substances 0.000 claims description 49
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 31
- 238000005238 degreasing Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 21
- 238000011282 treatment Methods 0.000 claims description 18
- 229920000620 organic polymer Polymers 0.000 claims description 16
- 229920001169 thermoplastic Polymers 0.000 claims description 16
- 239000004416 thermosoftening plastic Substances 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 10
- 239000000314 lubricant Substances 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims 1
- 238000010828 elution Methods 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 11
- 239000004014 plasticizer Substances 0.000 description 9
- 238000000465 moulding Methods 0.000 description 8
- 239000003960 organic solvent Substances 0.000 description 8
- 239000002904 solvent Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 230000008961 swelling Effects 0.000 description 6
- 235000021355 Stearic acid Nutrition 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 5
- 239000008117 stearic acid Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、金属やセラミックス等の粉末を可塑成形法に
よって成形し、これより焼結品を得るための方法に係わ
り、特に可塑成形体の組成および脱脂方法に関する。[Field of Industrial Application] The present invention relates to a method for molding a powder of metal, ceramics or the like by a plastic molding method to obtain a sintered product from the powder, and in particular to a plastic molded article. Composition and degreasing method.
「従来技術とその課題」 従来、金属粉末やセラミックス粉末から焼結品を製造す
る方法として、上記粉末に有機バインダーを配合して混
練することにより粉末に流動性を付与し、次いでこれを
可塑成形し、得られた成形体を脱脂・焼結することによ
って焼結品を製造する方法が知られている。ここでいう
可塑成形とは、射出成形、トランスファー成形および熱
間押出し成形を意味するものである。このとき、脱脂の
方法としては、 （イ）成形体を加熱にすることによって有機バインダー
を分解・蒸発させる方法、 （ロ）溶媒を用いて成形体から有機バインダーを抽出す
る方法がある。“Prior art and its problems” Conventionally, as a method for producing a sintered product from metal powder or ceramic powder, by mixing an organic binder with the above powder and kneading it to impart fluidity to the powder, and then plastic molding Then, a method of producing a sintered product by degreasing and sintering the obtained molded body is known. The plastic molding referred to here means injection molding, transfer molding and hot extrusion molding. At this time, as the degreasing method, there are (a) a method of decomposing and evaporating the organic binder by heating the molded body, and (b) a method of extracting the organic binder from the molded body using a solvent.
（イ）の方法においては、成形体を変形させることなく
脱脂するには非常に長い時間を要するという問題があ
る。すなわち可塑成形法では、混練物が加熱されること
によって軟化し、流動性を呈するという現象を利用する
ものであるため、成形体が加熱時に軟化して変形するこ
とが当然予想される。したがってこれを防ぐためには、
変形温度に達する前に混練物中に含まれる有機バインダ
ーの一部を除去するば良いと考えられるが、変形温度以
下で有機バインダーを分解しあるいは蒸発して除去する
のでは長時間が必要となる。また、変形温度以下で有機
バインダーが簡単に分解・蒸発するようであると、混練
物の可塑成形時における流動性が不安定となり、加え
て、ランナー部やスプルー部などの再生が困難となる。The method (a) has a problem that it takes a very long time to degrease the molded body without deforming it. That is, in the plastic molding method, since the phenomenon in which the kneaded material is softened by heating and exhibits fluidity is utilized, it is naturally expected that the molded article is softened and deformed when heated. So to prevent this,
It is considered that a part of the organic binder contained in the kneaded product may be removed before reaching the deformation temperature, but it takes a long time to decompose or evaporate and remove the organic binder below the deformation temperature. . Further, if the organic binder seems to be easily decomposed and evaporated at the deformation temperature or lower, the fluidity of the kneaded product during plastic molding becomes unstable, and in addition, it becomes difficult to regenerate the runner portion and the sprue portion.
また、加熱時の軟化の程度を抑えることにより、脱脂時
の変形を抑える方法では、可塑成形時の流動性が悪くな
り精密な成形が困難になる。一方、変形を防ぐために熱
硬化性樹脂を用いたり、昇華物質を加えたりする方法も
考えられるが、その場合には混練物の流動性が劣化した
り、ランナー部やスプルー部の再生が不可能になるとい
った問題がある。さらに（イ）の方法では、脱脂速度を
上げた場合に、脱脂初期の急激な有機バインダーの分解
・蒸発に起因して成形体にふくれや亀裂を生じるといっ
た問題もある。Further, in a method of suppressing deformation during degreasing by suppressing the degree of softening during heating, the fluidity during plastic molding deteriorates and precise molding becomes difficult. On the other hand, it is possible to use a thermosetting resin or add a sublimation substance to prevent deformation, but in that case, the fluidity of the kneaded product deteriorates, and the runner part and sprue part cannot be regenerated. There is a problem that becomes. Further, the method (a) has a problem that when the degreasing speed is increased, the molded body is swollen or cracked due to the rapid decomposition and evaporation of the organic binder in the initial stage of degreasing.
そこで、（ロ）の方法により、変形温度以下の低温にお
いて溶媒で有機バインダーの一部を溶出除去すれば、後
の加熱によっても変形が起きず、除去された有機バイン
ダーの部分が道となって残りの有機バインダーの分解・
蒸発ガスが抜けやすくなり、ふくれや亀裂が生じにくく
なる。また、熱的に不安定な成分を入れる必要がないこ
とからランナー部やスプルー部の再生も可能となる。Therefore, by the method of (b), if a part of the organic binder is eluted and removed with a solvent at a low temperature below the deformation temperature, the deformation does not occur even by the subsequent heating, and the removed part of the organic binder becomes a path. Decomposition of remaining organic binder
Evaporated gas is easily released, and blisters and cracks are less likely to occur. Moreover, since it is not necessary to add a thermally unstable component, it is possible to regenerate the runner portion and the sprue portion.
しかしながら、（ロ）の方法として行われている従来法
では、一般に溶媒として炭化水素、ハロゲン化炭化水素
のような有機溶媒を用いることが多いが、これら有機溶
媒は人体に有毒であるため、蒸気などを系内から出さず
また人が直接有機溶媒に触れないような特別な設備が必
要となり、しかもこれら有機溶媒は高価であることから
コストが高くなるといった不満がある。また、取り扱い
によっては引火などの危険を伴う場合があるので、管理
に十分な注意を必要とするといった問題もある。その
点、溶媒として水を用いれば上記のような問題は無く、
しかも有機溶媒の抽出工程に普通の水槽を使用すること
が可能であることなどから、コストの面でも有利であ
る。さらに、有機バインダと溶媒との組み合わせが良く
ないと、溶出時に有機バインダーが膨潤したり、有機バ
インダーを溶出するのに時間がかかるなどといった問題
もある。また、溶出される有機バインダーとして、溶剤
によって比較的除去され易い液状の可塑剤やオイル、さ
らにはステアリン酸やパラフィンなどの比較的低分子量
の潤滑剤または可塑剤が選ばれることもある。しかしな
がらこのような有機バインダーを用いた場合には、これ
ら物質が高分子化合物に比べ強度が低いので、有機バイ
ンダー中に多量に含まれると、成形体が柔らかくなりす
ぎたり脆くなったりして取り扱いが困難となり、したが
って添加量を増やすことが難しくなる。ところが、溶媒
によって溶出される有機バインダーの量が少ない場合、
成形体中に残った溶出されない有機バインダーの除去工
程に時間がかかり、溶出によって脱脂時間を短縮すると
いう効果が減じることになるといった問題がある。However, in the conventional method performed as the method (b), generally, an organic solvent such as a hydrocarbon or a halogenated hydrocarbon is often used as a solvent, but since these organic solvents are toxic to the human body, vapor It is complained that special equipment is required to prevent such substances from coming out of the system and that a person does not come into direct contact with the organic solvent, and these organic solvents are expensive, resulting in high costs. In addition, there is also a problem in that due to the risk of ignition and the like depending on the handling, sufficient care must be taken in management. In that respect, if water is used as the solvent, the above problem does not occur,
Moreover, since it is possible to use an ordinary water tank in the extraction step of the organic solvent, it is advantageous in terms of cost. Further, if the combination of the organic binder and the solvent is not good, there are problems that the organic binder swells during elution and it takes time to elute the organic binder. As the organic binder to be eluted, a liquid plasticizer or oil that is relatively easily removed by a solvent, or a relatively low molecular weight lubricant or plasticizer such as stearic acid or paraffin may be selected. However, when such an organic binder is used, the strength of these substances is lower than that of the high molecular weight compound. Therefore, if the organic binder is contained in a large amount, the molded body becomes too soft or brittle, which makes it difficult to handle. It becomes difficult, and thus it becomes difficult to increase the addition amount. However, when the amount of organic binder eluted by the solvent is small,
There is a problem that the step of removing the uneluted organic binder remaining in the molded body takes time, and the effect of shortening the degreasing time by elution is reduced.
この発明は上記事情に鑑みてなされたもので、その目的
とするところは、粉末の可塑成形法の脱脂工程におい
て、変形やふくれ、亀裂、膨潤を生じさせることなく短
時間での脱脂を可能にすることにある。The present invention has been made in view of the above circumstances, and an object thereof is to enable degreasing in a short time without causing deformation, swelling, cracking, or swelling in the degreasing step of the powder plastic molding method. To do.
「課題を解決するための手段」 この発明の方法では、粉末と有機バインダーを混合し、
これを可塑成形して成形体とした後、脱脂・焼結の各処
理を行って焼結体を製造する方法において、上記有機バ
インダーとして、重量％で、60〜90％のポリエチレンオ
キサイド、５〜38％の水に不溶の熱可塑性有機ポリマ
ー、２〜35％の潤滑剤及び／又は可塑剤を含む有機バイ
ンダーを用い、上記脱脂処理として、成形体と水とを接
触せしめて上記ポリエチレンオキサイドを溶出した後、
焼結処理を行うことを上記課題の解決手段とした。"Means for Solving the Problems" In the method of the present invention, a powder and an organic binder are mixed,
In a method for producing a sintered body by performing degreasing / sintering treatment after plastically molding this into a molded body, as the organic binder, 60 to 90% by weight of polyethylene oxide, 5 to Using the organic binder containing 38% of water-insoluble thermoplastic organic polymer and 2 to 35% of lubricant and / or plasticizer, as the degreasing treatment, the molded product is brought into contact with water to elute the polyethylene oxide. After doing
Performing a sintering treatment was used as a means for solving the above problems.
以下、この発明を詳しく説明する。Hereinafter, the present invention will be described in detail.
まず、粉末と有機バインダーを混合し、これを可塑成形
して成形体とする。ここで粉末としては、金属粉末、セ
ラミックス粉末などが用いられる。また、有機バインダ
ーとしては、重量％で、60〜90％のポリエチレンオキサ
イド、５〜38％の水に不溶の熱可塑性有機ポリマー、２
〜35％の潤滑剤及び／又は可塑剤を含むものが用いられ
る。すなわちポリエチレンオキサイドの量が60％以下で
あると、水によってポリエチレンオキサイドを溶出除去
した後に直ちに焼結を行った場合、焼結体にふくれ、亀
裂等を生じ易くなるため、加熱脱脂工程を別に設けるこ
とが必要となるからである。また、ポリエチレンオキサ
イドの量が90％以上の場合や、水に不溶の熱可塑性有機
ポリマーの量が５％以下の場合には、水によるポリエチ
レンオキサイドの溶出除去時に成形体が崩壊し易くなる
からである。さらに、潤滑剤および／または可塑剤の量
が２％以下であると流動性が不十分であり、35％以上で
は成形の際に分離が生じたり、成形体強度が低下したり
するからである。なおこの場合、上記成形体中に占める
有機バインダーの量としては40〜60体積％であることが
望ましい。First, a powder and an organic binder are mixed, and this is plastically molded to obtain a molded body. Here, as the powder, metal powder, ceramic powder, or the like is used. Further, as the organic binder, by weight%, 60 to 90% of polyethylene oxide, 5 to 38% of water-insoluble thermoplastic organic polymer, 2
Those containing ~ 35% lubricant and / or plasticizer are used. That is, when the amount of polyethylene oxide is 60% or less, if the polyethylene oxide is eluted and removed with water and then immediately sintered, swelling and cracks are likely to occur in the sintered body, so a separate heat degreasing step is provided. Is necessary. In addition, when the amount of polyethylene oxide is 90% or more, or when the amount of water-insoluble thermoplastic organic polymer is 5% or less, the molded body tends to collapse when the polyethylene oxide is eluted and removed by water. is there. Further, if the amount of the lubricant and / or the plasticizer is 2% or less, the fluidity is insufficient, and if it is 35% or more, separation may occur during molding or the strength of the molded body may decrease. . In this case, it is desirable that the amount of the organic binder in the molded body is 40 to 60% by volume.
ここでポリエチレンオキサイドは、常温でも水に完全に
溶解する水溶性バインダーであるため、特別な有機溶媒
を用いずとも水によって容易に溶出させることが可能で
あり、また熱可塑性を有するため可塑成形を行うことが
できる。さらに、常温での強度もあるため、混練物の流
動性や成形体強度を落とすことなく有機バインダー中の
ポリエチレンオキサイドの割合を高めることができ、し
たがって溶出される有機バインダーとしては最適とな
る。また、他の水に不溶の熱可塑性有機ポリマー、例え
ばポリスチレンやポリエチレンなどとの相溶性がある点
も、粉末の可塑成形に用いる有機バインダーとしての利
点となる。Here, polyethylene oxide is a water-soluble binder that is completely soluble in water even at room temperature, so it can be easily eluted with water without using a special organic solvent. It can be carried out. Furthermore, since it also has strength at room temperature, the proportion of polyethylene oxide in the organic binder can be increased without lowering the fluidity of the kneaded product and the strength of the molded product, and is therefore the most suitable organic binder to be eluted. Further, the fact that it is compatible with other water-insoluble thermoplastic organic polymers such as polystyrene and polyethylene is also an advantage as an organic binder used for plastic molding of powder.
またこのようなポリエチレンオキサイドとしては、その
分子量が５万未満であると流動性、水への溶出性は良好
となるものの得られる成形体の強度が不十分となり、50
0万を越えると逆に成形強度は十分となるものの流動
性、水へ溶出性が不十分となり、したがって分子量を５
万以上、500万以下の範囲とするのが好ましく、特に良
好な流動性、水への溶出性を得るためには10万以上、20
0万以下の範囲とするのが望ましい。In addition, when the molecular weight of such polyethylene oxide is less than 50,000, the fluidity and elution into water are good, but the strength of the obtained molded article is insufficient,
On the other hand, if it exceeds 0,000, on the contrary, the molding strength will be sufficient, but the fluidity and the elution into water will be insufficient, so that the molecular weight will be 5
It is preferably in the range of 10,000 or more and 5 million or less, and 100,000 or more, 20 or more in order to obtain particularly good fluidity and water solubility.
It is desirable that the range is less than or equal to 0,000.
上記水に不溶の熱可塑性有機ポリマーとしては、水中で
膨潤することがないポリスチレンやポリエチレンなどの
通常の粉末可塑成形に使用される可塑性有機ポリマーが
用いられる。中でも、流動性、成形体強度の点から、ポ
リスチレン、ポリエチレン、アクタティックポリプロピ
レン、エチレン−酢酸ビニル共重合体の少なくとも１種
を含むものが好適とされる。上記潤滑剤あるいは可塑剤
としは、ステアリン酸、ジオクチルフタレート、ジブチ
ルフタレートなどが用いられる。As the water-insoluble thermoplastic organic polymer, a plastic organic polymer which is not swollen in water, such as polystyrene or polyethylene, which is used in ordinary powder plastic molding is used. Among them, those containing at least one of polystyrene, polyethylene, atactic polypropylene, and ethylene-vinyl acetate copolymer are preferable from the viewpoints of fluidity and molded product strength. As the lubricant or plasticizer, stearic acid, dioctyl phthalate, dibutyl phthalate or the like is used.
次に、この成形体に脱脂処理を行って脱脂体とする。脱
脂処理としては、まず成形体を常温あるいは加熱された
水に接触せしめ、これにより上記水溶性の熱可塑性有機
ポリマーを溶出する方法が採られる。ここで、成形体と
常温あるいは加熱された水との接触方法としては、成形
体を水中に浸漬することによって処理するのが、作業性
等の点からもまた溶出時間の短縮といった点からも好適
とされる。また成形体を水中浸漬した際、常温あるいは
加熱された水を流動せしめ、溶出を加速するのも有効で
ある。Next, the molded body is subjected to a degreasing treatment to obtain a degreased body. As the degreasing treatment, a method is first used in which the molded body is brought into contact with water at room temperature or heated to elute the water-soluble thermoplastic organic polymer. Here, as a method of contacting the molded product with room temperature or heated water, it is preferable to treat the molded product by immersing the molded product in water from the viewpoint of workability and the shortening of the elution time. It is said that Further, when the molded body is immersed in water, it is also effective to make water heated at room temperature or heated to accelerate elution.
その後、この脱脂体に加熱焼結処理を行い、金属、セラ
ミックスなどからなる焼結体を得る。なお、この場合に
加熱焼結処理に先立って脱脂を行うことは不要であり、
しがって脱脂時間の大幅な短縮が可能となる。Then, the degreased body is subjected to heat sintering treatment to obtain a sintered body made of metal, ceramics or the like. In this case, it is not necessary to perform degreasing prior to the heating and sintering treatment,
Therefore, the degreasing time can be significantly shortened.
「作用」 この発明の方法によれば、有機バインダーとして重量％
で、60〜90％のポリエチレンオキサイドと、５〜38％の
水に不溶の熱可塑性有機ポリマーと、２〜35％の潤滑剤
及び／又は可塑剤とを含む有機バインダーを用いるの
で、可塑成形性が良好であり、また得られる成形体の強
度が高いものとなり、さらに脱脂処理として成形体と水
とを接触せしめて上記ポリエチレンオキサイドを溶出す
るので、高価で取り扱いにくい有機溶媒を用いる必要が
なく、溶出に要する時間が短く、かつ溶出時の上記水に
不溶の熱可塑性有機ポリマーの潤滑などに起因する成形
体の割れなどの発生が防止される。また、ポリエチレン
オキサイドを溶出除去することによって成形体中に含ま
れる有機バインダーが十分に減少しているため、焼結体
に変形やふくれ、亀裂が生じることなく、直ちに加熱焼
結処理を行うことが可能となる。"Operation" According to the method of the present invention, the weight% as an organic binder is
Therefore, since an organic binder containing 60 to 90% of polyethylene oxide, 5 to 38% of a water-insoluble thermoplastic organic polymer, and 2 to 35% of a lubricant and / or a plasticizer is used, plastic moldability is improved. Is good, and the strength of the obtained molded article is high, and since the polyethylene oxide is eluted by contacting the molded article with water as a degreasing treatment, it is not necessary to use an expensive and difficult-to-handle organic solvent, The time required for elution is short, and cracking of the molded body due to lubrication of the water-insoluble thermoplastic organic polymer at the time of elution is prevented. In addition, since the organic binder contained in the compact is sufficiently reduced by elution and removal of polyethylene oxide, it is possible to immediately perform the heat sintering treatment without causing deformation, swelling, or cracks in the sintered compact. It will be possible.
「実施例」 以下、実施例によりこの発明を具体的に説明する。[Examples] Hereinafter, the present invention will be specifically described with reference to Examples.
（実施例１） SUS−316L粉末（平均粒径約８μｍ）100重量部に、分子
量60万〜110万のポリエチレンオキサイド8.5重量部、ポ
リエチレン３重量部、ステアリン酸0.5重量部を配合
し、これを混練機によって150℃で60分間混練した。次
に、得られた混練物をペレット化し、さらにこれをリン
グ状複雑形状部品（最大肉厚部約５×6mm）に成形し
た。このときの成形条件として、射出温度を170℃、射
出圧力を800kg/cm2とした。(Example 1) To 100 parts by weight of SUS-316L powder (average particle size of about 8 µm), 8.5 parts by weight of polyethylene oxide having a molecular weight of 600,000 to 1.1 million, 3 parts by weight of polyethylene, and 0.5 part by weight of stearic acid were blended. The mixture was kneaded at 150 ° C. for 60 minutes with a kneader. Next, the obtained kneaded product was pelletized and further shaped into a ring-shaped complex shaped component (maximum wall thickness portion: about 5 × 6 mm). As molding conditions at this time, the injection temperature was 170 ° C. and the injection pressure was 800 kg / cm 2 .
次いで、得られた成形体を50℃の水に４時間浸し、取り
出した後大気中にて50℃で60分間乾燥した。このときの
バインダーの溶出率を調べたところ、総有機バインダー
中の70重量％のバインダーが除去されていた。その後、
この乾燥後の脱脂体を真空中にて５℃/min（300℃/hou
r）の昇温速度で1350℃まで昇温し、２時間焼結した。Next, the obtained molded body was dipped in water at 50 ° C. for 4 hours, taken out, and then dried in the atmosphere at 50 ° C. for 60 minutes. When the elution rate of the binder at this time was examined, 70% by weight of the binder in the total organic binder was removed. afterwards,
The degreased body after drying is vacuumed at 5 ° C / min (300 ° C / hou
The temperature was raised up to 1350 ° C. at the heating rate of r), and sintering was performed for 2 hours.
得られた焼結体の焼結密度を測定したところ、7.84g/cm
3となり、高い焼結密度を有するものであることが確認
された。When the sintered density of the obtained sintered body was measured, it was 7.84 g / cm.
It was 3 and it was confirmed to have a high sintered density.
（実施例２） 実施例１と同一のSUS−316L粉末100重量部に、分子量60
万〜110万のポリエチレンオキサイド９重量部、ポリエ
チレン２重量部、エチレン−酢酸ビニル共重合体0.7重
量部、ステアリン酸0.3重量部を上記実施例１と同様に
混練・射出を行い、寸法が5mm×5mm×10mmの塊状部品に
成形した。(Example 2) 100 parts by weight of the same SUS-316L powder as in Example 1 had a molecular weight of 60.
9 parts by weight of 10,000 to 1.1 million polyethylene oxide, 2 parts by weight of polyethylene, 0.7 parts by weight of ethylene-vinyl acetate copolymer, and 0.3 parts by weight of stearic acid were kneaded and injected in the same manner as in Example 1 to obtain a size of 5 mm × It was molded into a 5mm x 10mm block.
次に、得られた成形体を室温の水に８時間浸し、取り出
した後大気中にて50℃で60分間乾燥した。このときのバ
インダーの溶出率を調べたところ、総有機バインダー中
の75重量％のバインダーが除去されていた。その後、こ
の乾燥後の脱脂体を上記実施例１と同条件で焼結した。Next, the obtained molded body was immersed in water at room temperature for 8 hours, taken out, and then dried in the atmosphere at 50 ° C. for 60 minutes. When the elution rate of the binder at this time was examined, 75% by weight of the binder in the total organic binder was removed. Thereafter, the dried degreased body was sintered under the same conditions as in Example 1 above.
得られた焼結体の焼結密度を測定したところ、7.86g/cm
3となり、高い焼結密度を有するものであることが確認
された。When the sintered density of the obtained sintered body was measured, it was 7.86 g / cm.
It was 3 and it was confirmed to have a high sintered density.
（実施例３） 純鉄粉（平均粒径５μｍ）100重量部に、実施例１、２
と同一のポリエチレンオキサイド８重量部、ポリエチレ
ン1.5重量部、アタクティックポリポロピレン１重量
部、ステアリン酸0.5重量部を配合し、上記実施例１と
同様に混練・射出を行い、寸法が7mm×7mm×70mmの棒状
成形体を得た。(Example 3) 100 parts by weight of pure iron powder (average particle size 5 µm) was added to Examples 1 and 2
8 parts by weight of the same polyethylene oxide, 1.5 parts by weight of polyethylene, 1 part by weight of atactic polypropylene and 0.5 part by weight of stearic acid were mixed, and kneading and injection were carried out in the same manner as in Example 1 above, and the dimensions were 7 mm x 7 mm. A 70 mm rod-shaped molded body was obtained.
次いで、得られた成形体を室温水中に８時間浸し、取り
出した後大気中にて70℃で60分間乾燥した。このときの
バインダーの溶出率を調べたところ、総有機バインダー
中の75重量％のバインダーが除去されていた。その後、
この乾燥後の脱脂体を水素雰囲気にて５℃/minの昇温速
度で1350℃まで昇温し、１時間焼結した。Next, the obtained molded body was immersed in room temperature water for 8 hours, taken out, and then dried in the atmosphere at 70 ° C. for 60 minutes. When the elution rate of the binder at this time was examined, 75% by weight of the binder in the total organic binder was removed. afterwards,
The dried degreased body was heated to 1350 ° C. at a temperature rising rate of 5 ° C./min in a hydrogen atmosphere and sintered for 1 hour.
得られた焼結体の焼結密度を測定したところ、7.55g/cm
3となり、高い焼結密度を有するものであることが確認
された。When the sintered density of the obtained sintered body was measured, it was 7.55 g / cm.
It was 3 and it was confirmed to have a high sintered density.
「発明の効果」 以上説明したように、本発明における請求項１に記載し
た発明は、有機バインダーとして重量％で、60〜90％の
ポリエチレンオキサイド、５〜38％の水に不溶の熱可塑
性有機ポリマー、２〜35％の潤滑剤及び／又は可塑剤を
含む有機バインダーを用い、上記脱脂処理として、成形
体と水とを接触せしめて上記ポリエチレンオキサイドを
溶出した後、焼結処理を行うものであるから、可塑成形
性が良好であり、しかも得られた成形体の強度が高いも
のとなる。また、高価で取り扱いにくい有機溶媒を用い
る必要がなく、しかも溶出時に熱可塑性有機ポリマーの
膨潤などに起因する成形体の割れなどの発生を防止する
ことができる。さらに、速やかにポリエチレンオキサイ
ドが溶出除去されるため脱脂時間が短く、またポリエチ
レンオキサイドを溶出除去することによって成形体中に
含まれる有機バインダーが十分に減少しているため、加
熱脱脂を実施せずに、直後、真空下あるいは大気雰囲気
下での焼結で通常用いられる昇温速度で加熱を行って
も、焼結体に変形やふくれ、亀裂が生じることなく、よ
って特別な加熱脱脂処理を行うことなく、総脱脂時間を
大幅に短縮することができる。すなわち、有機バインダ
ーは、ポリエチレンオキサイドを重量％で60〜90％含む
ので、成形体中のポリエチレンオキサイドを十分に溶出
させることにより、成形体中の有機バインダーの含有量
が大幅に減少する。このため、成形体を加熱脱脂する加
熱脱脂装置が不要となり、脱脂時間を大幅に短縮でき、
ハンドリング時間を短縮することができ、経済性の高い
プロセスを得ることができる。"Effects of the Invention" As described above, the invention described in claim 1 of the present invention is, as an organic binder, 60 to 90% by weight of polyethylene oxide and 5 to 38% of water-insoluble thermoplastic organic compound. Using a polymer, an organic binder containing 2 to 35% of a lubricant and / or a plasticizer, as the degreasing treatment, the molding is brought into contact with water to elute the polyethylene oxide, and then the sintering treatment is performed. Therefore, the plastic moldability is good, and the strength of the obtained molded product is high. Further, it is not necessary to use an expensive and difficult-to-handle organic solvent, and it is possible to prevent cracking of the molded product due to swelling of the thermoplastic organic polymer during elution. Furthermore, since polyethylene oxide is rapidly eluted and removed, the degreasing time is short, and since polyethylene oxide is eluted and removed, the organic binder contained in the molded body is sufficiently reduced, so heating degreasing is not necessary. Immediately after that, even if heating is performed at a heating rate that is usually used in sintering in a vacuum or in an air atmosphere, deformation, swelling, or cracks do not occur in the sintered body, so special heat degreasing treatment must be performed. Therefore, the total degreasing time can be significantly reduced. That is, since the organic binder contains 60 to 90% by weight of polyethylene oxide, the content of the organic binder in the molded product is significantly reduced by sufficiently eluting the polyethylene oxide in the molded product. Therefore, a heating and degreasing device for heating and degreasing the molded body is not required, and the degreasing time can be greatly shortened.
The handling time can be shortened and a highly economical process can be obtained.
また、有機バインダーは、重量％で、60〜90％のポリエ
チレンオキサイド、５〜38％の水に不溶の熱可塑性有機
ポリマー、２〜35％の潤滑剤及び／又は可塑剤を含み、
水溶性の熱可塑性有機ポリマーとして、ポリエチレンオ
キサイドを用いたので、可塑成形性に優れ、成形体強度
を高めることができ、微細な複雑形状が成形可能にな
る。In addition, the organic binder comprises, by weight, 60 to 90% of polyethylene oxide, 5 to 38% of a water-insoluble thermoplastic organic polymer, and 2 to 35% of a lubricant and / or a plasticizer.
Since polyethylene oxide is used as the water-soluble thermoplastic organic polymer, it has excellent plastic moldability, can increase the strength of the molded body, and can mold a minute complex shape.
さらに、成形体中のポリエチレンオキサイドを溶出した
後、焼結処理を行うので、ポリエチレンオキサイドに比
べ少ない量の不溶の熱可塑性有機ポリマーがポリエチレ
ンオキサイドの溶出により生じる孔を通り抜け、成形体
が焼結される。このため、加熱脱脂を実施しなくても、
成形体の欠陥の発生を防止でき、信頼性の高い製品を製
造できる。Furthermore, since the sintering treatment is performed after the polyethylene oxide in the molded body is eluted, a smaller amount of insoluble thermoplastic organic polymer than the polyethylene oxide passes through the holes generated by the dissolution of polyethylene oxide, and the molded body is sintered. It Therefore, even if you do not heat degreasing
It is possible to prevent the occurrence of defects in the molded body and manufacture a highly reliable product.
また、本発明の請求項３に記載した発明にあっては、ポ
リエチレンオキサイドとしてその分子量が５万以上であ
りかつ500万以下のものを用いるため、可塑成形性、水
への溶出性、成形体強度に優れたものとなる。Further, in the invention described in claim 3 of the present invention, since polyethylene oxide having a molecular weight of 50,000 or more and 5 million or less is used, plastic moldability, elution into water, molded products It has excellent strength.
さらに、本発明の請求項２および４に記載した発明にあ
っては、いずれも請求項１に記載した発明の効果により
一層高めることができる。Furthermore, in the inventions described in claims 2 and 4 of the present invention, both can be further enhanced by the effect of the invention described in claim 1.
また、本発明の請求項５に記載した発明にあっては、成
形体を水中に浸漬するようにしたので、処理に際しての
作業性を十分に向上し得るとともに、水溶性熱可塑性有
機ポリマーの溶出を短時間にて確実に行うことができ
る。Further, in the invention described in claim 5 of the present invention, since the molded body is immersed in water, workability during treatment can be sufficiently improved, and elution of the water-soluble thermoplastic organic polymer can be achieved. Can be reliably performed in a short time.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 緒方 茂昭 千葉県市川市新田２―１―11 (72)発明者 片桐 義雄 東京都江東区亀戸６丁目31番１号 セイコ ー電子工業株式会社内 (72)発明者 藤田 勝幸 東京都江東区亀戸６丁目31番１号 セイコ ー電子工業株式会社内 (72)発明者 輪違 忠彦 宮城県仙台市太白区西多賀５丁目30番１号 セイコー電子部品株式会社内 (72)発明者 平塚 浩義 宮城県仙台市太白区西多賀５丁目30番１号 セイコー電子部品株式会社内 (56)参考文献 特開 平２−182804（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeaki Ogata 2-1-11 Nitta, Ichikawa City, Chiba Prefecture (72) Inventor Yoshio Katagiri 6-31-1, Kameido, Koto-ku, Tokyo Seiko Electronic Industry Co., Ltd. (72) Inventor Katsuyuki Fujita 6-31-1, Kameido, Koto-ku, Tokyo Seiko Electronics Industry Co., Ltd. (72) Inventor Hiroyoshi Hiratsuka 5-30-1 Nishitaga, Taihaku-ku, Sendai-shi, Miyagi Seiko Electronic Components Co., Ltd. (56) Reference JP-A-2-182804 (JP, A)
Claims (5)
塑成形して成形体とした後、脱脂・焼結の各処理を行っ
て焼結体を製造する方法において、 上記有機バインダーとして、重量％で、60〜90％のポリ
エチレンオキサイド、５〜38％の水に不溶の熱可塑性有
機ポリマー、２〜35％の潤滑剤及び／又は可塑剤を含む
有機バインダーを用い、 上記脱脂処理として、成形体と水とを接触せしめて上記
ポリエチレンオキサイドを溶出した後、焼結処理を行う
ことを特徴とする粉末の可塑成形による焼結品の製造方
法。1. A method for producing a sintered body by mixing powder and an organic binder, plastic-molding the mixture to form a molded body, and then performing degreasing and sintering treatments to produce a sintered body. %, Using 60-90% polyethylene oxide, 5-38% water-insoluble thermoplastic organic polymer, 2-35% lubricant and / or organic binder-containing organic binder as the degreasing treatment. A method for producing a sintered product by plastic molding of a powder, which comprises contacting a body with water to elute the polyethylene oxide, and then performing a sintering treatment.
形体中に占める有機バインダーの量として、40〜60体積
％であることを特徴とする粉末の可塑成形による焼結品
の製造方法。2. The method for producing a sintered product by plastic molding of powder according to claim 1, wherein the amount of the organic binder in the compact is 40 to 60% by volume.
チレンオキサイドの分子量が５万以上でありかつ500万
以下であることを特徴とする粉末の可塑成形による焼結
品の製造方法。3. The method according to claim 1, wherein the polyethylene oxide has a molecular weight of 50,000 or more and 5,000,000 or less, and a method for producing a sintered product by plastic molding of powder.
溶の熱可塑性有機ポリマーとして、ポリスチレン、ポリ
エチレン、アタクティックポリプロピレン、エチレン−
酢酸ビニル共重合体の少なくとも１種を用いることを特
徴とする粉末の可塑成形による焼結品の製造方法。4. The method according to claim 1, wherein the water-insoluble thermoplastic organic polymer is polystyrene, polyethylene, atactic polypropylene, ethylene-
A method for producing a sintered product by plastic molding of a powder, which comprises using at least one kind of vinyl acetate copolymer.
理における成形体と水との接触を、成形体を水中に浸漬
することによって処理することを特徴とする粉末の可塑
成形による焼結品の製造方法。5. The sintered product obtained by plastic molding of a powder according to claim 1, wherein the contact between the molded body and water in the degreasing treatment is carried out by immersing the molded body in water. Manufacturing method.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1128261A JPH0689370B2 (en) | 1989-05-22 | 1989-05-22 | Method for producing sintered product by plastic molding of powder |
| US07/417,198 US5059388A (en) | 1988-10-06 | 1989-10-04 | Process for manufacturing sintered bodies |
| KR1019890014358A KR930006005B1 (en) | 1988-10-06 | 1989-10-06 | Manufacturing method of sintered body |
| EP89118587A EP0362866B1 (en) | 1988-10-06 | 1989-10-06 | Process for manufacturing sintered bodies |
| DE68914379T DE68914379T2 (en) | 1988-10-06 | 1989-10-06 | Process for the production of sintered bodies. |
| HK102095A HK102095A (en) | 1988-10-06 | 1995-06-22 | Process for manufacturing sintered bodies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1128261A JPH0689370B2 (en) | 1989-05-22 | 1989-05-22 | Method for producing sintered product by plastic molding of powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02305903A JPH02305903A (en) | 1990-12-19 |
| JPH0689370B2 true JPH0689370B2 (en) | 1994-11-09 |
Family
ID=14980474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1128261A Expired - Fee Related JPH0689370B2 (en) | 1988-10-06 | 1989-05-22 | Method for producing sintered product by plastic molding of powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0689370B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5877270A (en) * | 1994-03-14 | 1999-03-02 | Kabushiki Kaisha Komatsu Seisakusho | Water solvent extraction degreasing method and molded products produced therewith |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0689372B2 (en) * | 1989-01-05 | 1994-11-09 | 住友セメント株式会社 | Degreasing method for powder compact |
-
1989
- 1989-05-22 JP JP1128261A patent/JPH0689370B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02305903A (en) | 1990-12-19 |
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