JPH055643B2 - - Google Patents
Info
- Publication number
- JPH055643B2 JPH055643B2 JP59044477A JP4447784A JPH055643B2 JP H055643 B2 JPH055643 B2 JP H055643B2 JP 59044477 A JP59044477 A JP 59044477A JP 4447784 A JP4447784 A JP 4447784A JP H055643 B2 JPH055643 B2 JP H055643B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- intermediate layer
- ceramic
- pressurized medium
- permeation prevention
- 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 - Lifetime
Links
- 239000000843 powder Substances 0.000 claims description 37
- 239000000919 ceramic Substances 0.000 claims description 31
- 230000002265 prevention Effects 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 239000011812 mixed powder Substances 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 description 10
- 239000004945 silicone rubber Substances 0.000 description 10
- 239000012528 membrane Substances 0.000 description 9
- 238000000748 compression moulding Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000462 isostatic pressing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Ceramic Products (AREA)
Description
【発明の詳細な説明】
〔技術分野〕
本発明はセラミツク焼結体の製造方法に関し、
特に静水圧成形を利用したセラミツク焼結体の製
造方法に関する。[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for manufacturing a ceramic sintered body,
In particular, it relates to a method of manufacturing ceramic sintered bodies using isostatic pressing.
セラミツク焼結体は、通常セラミツク原料を所
定形状に成形し、得られたセラミツク成形体を焼
成することにより製造される。このセラミツク成
形体を成形する方法としては、一軸圧縮成形、等
方圧縮成形、連続圧縮成形等の方法があり、等方
圧縮成形は一軸圧縮成形に比べ均一な密度の成形
体を得ることができる。
A ceramic sintered body is usually manufactured by molding a ceramic raw material into a predetermined shape and firing the obtained ceramic molded body. Methods for molding this ceramic molded body include uniaxial compression molding, isotropic compression molding, continuous compression molding, etc. Isotropic compression molding can obtain a molded body with a more uniform density than uniaxial compression molding. .
この等方圧縮成形の一つに静水圧成形がある。
従来、静水圧成形を用いてセラミツク焼結体を製
造するには、まずセラミツク粉末と焼結助剤の混
合粉末を所定形状に予備成形し、この予備成形体
の表面全体に有機粉末、昇華性粉末、高耐火性粉
末等の焼結されない粉末を付着させて粉末中間層
を形成する。続いて、この粉末中間層の上にゴム
またはプラスチツクの被膜形成液体を付着させ、
加圧媒体浸透防止膜を形成する。この加圧媒体浸
透防止膜付き予備成形体を油、水等の液体中に入
れ、加圧することにより所定形状のセラミツク成
形体とし、このセラミツク成形体を焼成すること
によりセラミツク焼結体を得ている。 One type of isostatic compression molding is hydrostatic pressing.
Conventionally, in order to produce a ceramic sintered body using isostatic pressing, a mixed powder of ceramic powder and a sintering aid is first preformed into a predetermined shape, and the entire surface of this preform is coated with organic powder, sublimable powder, etc. A non-sintered powder such as powder, highly refractory powder, etc. is deposited to form a powder intermediate layer. A rubber or plastic film-forming liquid is then deposited on top of this powder intermediate layer;
Forms a pressurized medium permeation prevention membrane. This preformed body with a pressurized media permeation prevention film is placed in a liquid such as oil or water and pressurized to form a ceramic molded body of a predetermined shape, and this ceramic molded body is fired to obtain a ceramic sintered body. There is.
ところで、粉末中間層はゴムまたはプラスチツ
ク等の被膜形成液体との濡れ性が良くない。この
ため、上記工程において、粉末中間層の上に被膜
形成液体により加圧媒体浸透防止膜を完全に形成
するのに多大な時間を要し、作業性が悪いという
問題があつた。 Incidentally, the powder intermediate layer has poor wettability with film-forming liquids such as rubber or plastic. Therefore, in the above process, it takes a lot of time to completely form the pressurized medium permeation prevention film on the powder intermediate layer with the film forming liquid, resulting in a problem of poor workability.
本発明は、上記従来技術の問題を解決するため
になされたもので、本発明の目的は、静水圧成形
を用いるセラミツク焼結体の製造方法において、
粉末中間層と被膜形成液体との濡れ性を改善する
ことにより、加圧媒体浸透防止膜の形成の容易化
および迅速化を図ることにある。
The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a method for manufacturing a ceramic sintered body using isostatic pressing.
The object of the present invention is to facilitate and speed up the formation of a pressurized medium permeation prevention film by improving the wettability between the powder intermediate layer and the film-forming liquid.
かかる目的は、本発明によれば、セラミツク粉
末と焼結助剤の混合粉末を所定形状に予備成形
し、得られた予備成形体の表面に粉末中間層を形
成した後、加圧媒体浸透防止膜で被覆し、次いで
液体中で等方的に加圧し、得られたセラミツク成
形体を焼成するセラミツク焼結体の製造方法であ
つて、
前記予備成形体の表面に粉末中間層を形成後、
加圧媒体浸透防止膜で被覆する前に、この粉末中
間層の上に黒鉛粉末層を形成することを特徴とす
るセラミツク焼結体の製造方法によつて達成され
る。
According to the present invention, this purpose is to preform a mixed powder of ceramic powder and a sintering aid into a predetermined shape, form a powder intermediate layer on the surface of the obtained preform, and then prevent pressurized medium from penetrating. A method for producing a ceramic sintered body, which comprises coating the preformed body with a film, then isotropically pressurizing it in a liquid, and firing the obtained ceramic molded body, the method comprising: forming a powder intermediate layer on the surface of the preformed body;
This is achieved by a method for producing a ceramic sintered body, which is characterized in that a graphite powder layer is formed on the powder intermediate layer before being coated with a pressurized medium permeation prevention membrane.
本発明によれば、粉末中間層と加圧媒体浸透防
止膜の間に、加圧媒体浸透防止膜と濡れ性がよい
黒鉛粉末層を形成したため、加圧媒体浸透防止膜
の形成が極めて容易に行なえる。 According to the present invention, a graphite powder layer having good wettability with the pressurized medium permeation preventive film is formed between the powder intermediate layer and the pressurized medium permeation preventive film, making it extremely easy to form the pressurized medium permeation preventive film. I can do it.
以上より、本発明のセラミツク焼結体の製造方
法によれば、以下の効果を奏する。
As described above, the method for manufacturing a ceramic sintered body of the present invention provides the following effects.
(イ) 加圧媒体浸透防止膜の形成が極めて容易とな
り、加圧媒体浸透防止膜形成の迅速化が図れ、
作業時間が短縮される。このため、セラミツク
焼結体の効率的な製造が可能となる。(b) It is extremely easy to form a pressurized medium permeation prevention membrane, and the formation of a pressurized medium permeation prevention membrane can be speeded up.
Work time is reduced. Therefore, it becomes possible to efficiently manufacture ceramic sintered bodies.
(ロ) 従来の方法では、加圧媒体浸透防止膜を燃焼
して除去する場合、粉末中間層とセラミツク成
形体表面が一緒に剥がれるため肌荒れが顕著で
あつたが、本発明では黒鉛粉末層が介在してい
るため、粉末中間層とセラミツク成形体表面の
剥離が生ぜず、もつて肌荒れ防止が図れる。(b) In the conventional method, when the pressurized medium permeation prevention membrane was removed by burning, the intermediate powder layer and the surface of the ceramic molded body were peeled off together, resulting in noticeable surface roughness, but in the present invention, the graphite powder layer Because of the presence of the powder, no peeling occurs between the powder intermediate layer and the surface of the ceramic molded body, thereby preventing rough skin.
次に、本発明の実施例を図面を参考にして説明
する。
Next, embodiments of the present invention will be described with reference to the drawings.
図は本発明の実施例に係るセラミツク焼結体の
製造方法の一工程を示す断面図である。 The figure is a sectional view showing one step of a method for manufacturing a ceramic sintered body according to an embodiment of the present invention.
重量％で90％の窒化ケイ素（Si3N4）粉末と、
７％のイツトリア（Y2O3）粉末と、３％のアル
ミナ（Al2O3）粉末とからなるセラミツク原料を
混合し、この混合粉末を用いてターボチヤージヤ
用ロータ形状に予備成形した。得られた予備成形
体１の表面に、窒化ホウ素粉末をスプレーにより
付着させ、粉末中間層２を形成した。次いで、こ
の粉末中間層２の上に、黒鉛粉末をスプレーによ
り付着させ、黒鉛粉末層３を形成した。続いて、
シリコンゴム溶液中に１回浸漬し、引き上げるこ
とにより加圧媒体浸透防止膜としてのシリコンゴ
ム膜４を形成した。この結果、図に示す予備成形
体が製作された。この予備成形体を水中に入れ、
1.5ton／cm2の静水圧を負荷し、セラミツク成形体
を得た。このセラミツク成形体を450℃に加熱し
てシリコンゴム膜４を燃焼除去した後、1800℃で
２時間焼成してセラミツク焼結体としてのセラミ
ツク製ターボチヤージヤ用ロータを製造した。 90% by weight silicon nitride (Si 3 N 4 ) powder;
A ceramic raw material consisting of 7% itria (Y 2 O 3 ) powder and 3% alumina (Al 2 O 3 ) powder was mixed, and this mixed powder was preformed into the shape of a rotor for a turbocharger. Boron nitride powder was applied to the surface of the obtained preform 1 by spraying to form a powder intermediate layer 2. Next, graphite powder was applied onto this powder intermediate layer 2 by spraying to form a graphite powder layer 3. continue,
A silicone rubber film 4 was formed as a pressurized medium permeation prevention film by immersing it once in a silicone rubber solution and pulling it up. As a result, the preform shown in the figure was manufactured. Place this preform in water,
A hydrostatic pressure of 1.5 ton/cm 2 was applied to obtain a ceramic molded body. This ceramic molded body was heated to 450°C to burn off the silicone rubber film 4, and then fired at 1800°C for 2 hours to produce a ceramic rotor for a turbocharger as a ceramic sintered body.
（比較例）
実施例と同様にして予備成形体を成形した後、
この予備成形体の表面に窒化ホウ素粉末をスプレ
ーにより付着させ、粉末中間層を形成した。この
粉末中間層を形成した予備成形体をシリコンゴム
溶液中に３回浸漬して加圧媒体浸透防止膜を形成
した。このとき、粉末中間層の上で、シリコンゴ
ム溶液が付着しにくい部分は、注射器を用いてシ
リコンゴム溶液を付着させた。その後は、実施例
と同様にしてセラミツク製ターボチヤージヤ用ロ
ータを製造した。(Comparative example) After molding a preform in the same manner as in the example,
Boron nitride powder was applied to the surface of this preform by spraying to form a powder intermediate layer. The preformed body with the powder intermediate layer formed thereon was immersed three times in a silicone rubber solution to form a pressurized medium permeation prevention membrane. At this time, a syringe was used to apply the silicone rubber solution to areas on the powder intermediate layer where the silicone rubber solution was difficult to adhere. Thereafter, a ceramic rotor for a turbocharger was manufactured in the same manner as in the example.
以上より、比較例では、シリコンゴム溶液に１
回浸漬しただけではシリコンゴム溶液が予備成形
体の表面全体に付着せず、まだらになり、完全に
被覆するのに注射器による部分補修を加えて３回
浸漬する必要があつたのに対し、本実施例では１
回の浸漬で予備成形体表面を完全に被覆すること
ができた。従つて、本発明によれば、加圧媒体浸
透防止膜の形成が極めて容易となり、作業の迅速
化が図れることが判る。 From the above, in the comparative example, 1
If the silicone rubber solution was only dipped twice, the silicone rubber solution would not adhere to the entire surface of the preform and it would become mottled, and it would have to be dipped three times in addition to partial repair with a syringe to completely cover it. In the example, 1
The surface of the preform could be completely covered by dipping once. Therefore, it can be seen that according to the present invention, it is extremely easy to form a pressurized medium permeation prevention membrane, and the work can be done quickly.
また、加圧媒体浸透防止膜としてのシリコンゴ
ム膜を燃焼除去する際、比較例では粉末中間層と
予備成形体表面が一緒に剥がれるため、肌荒れが
顕著であつたのに対し、本実施例では黒鉛粉末層
が粉末中間層の上に設けられているため、粉末中
間層と予備成形体表面の剥離が生ぜず、肌荒れが
大幅に低減された。 Furthermore, when the silicone rubber film serving as the pressurized medium permeation prevention film was burned and removed, the powder intermediate layer and the surface of the preform were peeled off together in the comparative example, resulting in noticeable skin roughness, whereas in the present example Since the graphite powder layer was provided on the powder intermediate layer, peeling between the powder intermediate layer and the surface of the preform did not occur, and surface roughness was significantly reduced.
以上、本発明の特定の実施例について説明した
が、本発明は、この実施例に限定されるものでは
なく、特許請求の範囲に記載の範囲内で種々の実
施態様が包含されるものである。 Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. .
図は本発明の実施例に係るセラミツク焼結体の
製造方法の一工程を示す断面図である。
１……予備成形体、２……粉末中間層、３……
黒鉛粉末層、４……シリコンゴム膜（加圧媒体浸
透防止膜）。
The figure is a sectional view showing one step of a method for manufacturing a ceramic sintered body according to an embodiment of the present invention. 1... Preformed body, 2... Powder intermediate layer, 3...
Graphite powder layer, 4... silicone rubber membrane (pressurized medium penetration prevention membrane).
Claims (1)
形状に予備成形し、得られた予備成形体の表面に
粉末中間層を形成した後、加圧媒体浸透防止膜で
被覆し、次いで液体中で等方的に加圧し、得られ
たセラミツク成形体を焼成するセラミツク焼結体
の製造方法であつて、 前記予備成形体の表面に粉末中間層を形成後、
加圧媒体浸透防止膜で被覆する前に、この粉末中
間層の上に黒鉛粉末層を形成することを特徴とす
るセラミツク焼結体の製造方法。[Claims] 1. Preforming a mixed powder of ceramic powder and a sintering aid into a predetermined shape, forming a powder intermediate layer on the surface of the obtained preform, and then covering it with a pressurized medium permeation prevention film. and then pressurizing isotropically in a liquid and firing the obtained ceramic molded body, the method comprising: forming a powder intermediate layer on the surface of the preformed body;
A method for producing a ceramic sintered body, which comprises forming a graphite powder layer on the powder intermediate layer before coating with a pressurized medium permeation prevention film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59044477A JPS60191066A (en) | 1984-03-07 | 1984-03-07 | Manufacture of ceramic sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59044477A JPS60191066A (en) | 1984-03-07 | 1984-03-07 | Manufacture of ceramic sintered body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60191066A JPS60191066A (en) | 1985-09-28 |
| JPH055643B2 true JPH055643B2 (en) | 1993-01-22 |
Family
ID=12692609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59044477A Granted JPS60191066A (en) | 1984-03-07 | 1984-03-07 | Manufacture of ceramic sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60191066A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938673A (en) * | 1989-01-17 | 1990-07-03 | Adrian Donald J | Isostatic pressing with microwave heating and method for same |
-
1984
- 1984-03-07 JP JP59044477A patent/JPS60191066A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60191066A (en) | 1985-09-28 |
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