JPS6119598B2 - - Google Patents
Info
- Publication number
- JPS6119598B2 JPS6119598B2 JP54172809A JP17280979A JPS6119598B2 JP S6119598 B2 JPS6119598 B2 JP S6119598B2 JP 54172809 A JP54172809 A JP 54172809A JP 17280979 A JP17280979 A JP 17280979A JP S6119598 B2 JPS6119598 B2 JP S6119598B2
- Authority
- JP
- Japan
- Prior art keywords
- silicon carbide
- pores
- molten metal
- sintered
- recrystallized
- 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
Links
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 22
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000001947 vapour-phase growth Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- -1 aluminum and zinc Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Landscapes
- Ceramic Products (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
- Furnace Details (AREA)
Description
【発明の詳細な説明】
本発明はアルミニウム等の低融点金属の溶解又
は保持に使用する投込みヒーター用保護管、ガス
吹込管、熱電対用保護管等の材料に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to materials for immersion heater protection tubes, gas blowing tubes, thermocouple protection tubes, etc. used for melting or holding low melting point metals such as aluminum.
従来のアルミニウム用溶解炉又は保持炉には一
般に鋳鉄製、炭素製のもの、或いは窒化珪素結合
の炭化珪素焼結体が用いられていた。鋳鉄製のも
のは溶融金属中に鉄分が溶出し易く、又炭素製の
ものは酸化消耗が激しく５〜10日の寿命であつ
た。又窒化珪素結合炭化珪素焼結体は気孔率が16
〜18％を有しているため溶湯が漏出し易く、ヒー
ター用保護管、或いは熱電対保護管として使用し
た場合短絡して使用不能になる等の欠点があつ
た。 Conventional aluminum melting furnaces or holding furnaces are generally made of cast iron, carbon, or silicon carbide sintered bodies bonded with silicon nitride. Those made of cast iron tend to have iron eluted into the molten metal, and those made of carbon suffer from severe oxidation consumption and have a lifespan of 5 to 10 days. In addition, the porosity of the silicon nitride-bonded silicon carbide sintered body is 16.
18%, the molten metal tends to leak out, and when used as a heater protection tube or thermocouple protection tube, it has short circuits and becomes unusable.
又、溶湯の表面には一般にフラツクスと呼ばれ
る酸化防止剤が浮べられているが、フラツクスは
Nacl，NaF等のアルカリを主成分としているため
侵蝕姓が強く、特にSiO2等の保護管は短時間で
反応するので使用が不能である。 Additionally, an antioxidant called flux is generally floating on the surface of the molten metal.
Since the main component is alkali such as NaCl or NaF, it is highly corrosive, and in particular, protective tubes such as SiO 2 cannot be used because they react in a short period of time.
本発明はアルミニウム、亜鉛等の低融点金属又
はそれらのフラツクスとの反応に対して抵抗性の
ある再結晶質炭化珪素を溶解又は保持炉用部材と
して使用するものである。通常の製造法によつて
得られる再結晶質炭化珪素成形体は５〜40％の見
掛け気孔率を有するが、再結晶質炭化珪素はアル
ミニウム、亜鉛の溶湯とのぬれが悪く、従つて気
孔を有するにもかかわらず窒化珪素結合の炭化珪
素材等と比較すると溶湯の浸透が少ない。然し乍
ら、長時間の使用によつて徐々に侵入し、ついに
は内表面迄透過する。 The present invention uses recrystallized silicon carbide, which is resistant to reactions with low melting point metals such as aluminum and zinc, or their fluxes, as a member for a melting or holding furnace. Recrystallized silicon carbide molded bodies obtained by normal manufacturing methods have an apparent porosity of 5 to 40%, but recrystallized silicon carbide has poor wettability with molten aluminum and zinc, and therefore has no pores. Despite this, the penetration of molten metal is low compared to silicon carbide materials with silicon nitride bonds. However, with long-term use, it gradually invades and eventually penetrates to the inner surface.
本発明は上述する欠点を除去することを目的と
し、本発明の方法は５〜40％の見掛け気孔率を有
する再結晶質炭化珪素体を用い、その気孔にコロ
イド状アルミナの充填剤を充填し、この充填した
炭化珪素体の表面に気相成長により緻密質炭化珪
素又は窒化珪素をコーテイングすることを特徴と
する。 The present invention aims to eliminate the above-mentioned drawbacks, and the method of the present invention uses a recrystallized silicon carbide body having an apparent porosity of 5 to 40%, and fills the pores with a filler of colloidal alumina. The method is characterized in that the surface of the filled silicon carbide body is coated with dense silicon carbide or silicon nitride by vapor phase growth.
本発明の方法においては上述する再結晶質炭化
珪素成形体の気孔中にコロイド状のアルミナの耐
熱耐蝕性充填剤を充填して焼結させ、かかる充填
剤によつて気孔率を低下させ溶湯の浸透を抑制す
る。 In the method of the present invention, a colloidal alumina heat-resistant and corrosion-resistant filler is filled into the pores of the recrystallized silicon carbide compact and sintered. Suppresses penetration.
即ち、コロイド状のアルミナは容易に気孔中に
含浸され、焼結させることによつて気孔を閉塞
し、これが溶湯との複合体を形成して硬質生成物
となり絨密層を形成するためであると考えられ
る。 That is, colloidal alumina is easily impregnated into the pores and is sintered to close the pores, forming a complex with the molten metal to form a hard product and a dense layer. it is conceivable that.
上記充填剤の耐熱耐蝕性材料を気孔に含浸させ
た後の再結晶質炭化珪素体の気孔率はできるだけ
小さいものであることが好ましい。特に耐熱耐蝕
性材料は含浸後焼結させるので、気孔を100％充
填することは困難であるが、含浸焼結処理を繰り
返すことによつて気孔を殆んど零近くの見掛け気
孔率に低下させることができる。 It is preferable that the porosity of the recrystallized silicon carbide body after the pores are impregnated with the heat-resistant and corrosion-resistant material of the filler is as small as possible. In particular, since heat-resistant and corrosion-resistant materials are sintered after impregnation, it is difficult to fill 100% of the pores, but by repeating the impregnation and sintering process, the pores can be reduced to an apparent porosity close to zero. be able to.
かかる処理によつて気孔の少なくとも1/2以上
を充填せしめれば、溶湯の浸透を抑制する効果は
著しく増大する。 If at least 1/2 or more of the pores are filled by such treatment, the effect of suppressing penetration of molten metal will be significantly increased.
更に、上述するように含浸焼結した表面に炭化
珪素又は窒化珪素を気相成長法でコーテイングす
ることにより耐用期間を更に延長する優れた効果
を達成することができる。 Furthermore, by coating the impregnated and sintered surface with silicon carbide or silicon nitride using a vapor phase growth method as described above, an excellent effect of further extending the service life can be achieved.
以下に本発明の実施例を図面と共に説明する。
本発明の方法は低融点金属の溶解及び保持する溶
解炉又は保持炉に使用される部材、即ち容器１、
ヒーター保護管５、ガス吹込管６及び熱電対保護
管８等の部材の少なくとも一つを再結晶質炭化珪
素体で形成するもので、かかる部材を溶湯（低融
点金属）２又はフラツクス９から保護するために
再結晶質炭化珪素体を有する５〜40％の気孔中に
コロイド状のアルミナを充填焼結させ、その気孔
を50％以上閉塞させることができる。 Embodiments of the present invention will be described below with reference to the drawings.
The method of the present invention includes members used in a melting furnace or holding furnace for melting and holding a low melting point metal, namely a container 1,
At least one of the members such as the heater protection tube 5, the gas blowing tube 6, and the thermocouple protection tube 8 is formed of a recrystallized silicon carbide body, and this member is protected from the molten metal (low melting point metal) 2 or the flux 9. In order to do this, colloidal alumina is filled and sintered into 5 to 40% of the pores in the recrystallized silicon carbide body, thereby making it possible to block 50% or more of the pores.
図面に示すように、容器１内の溶湯（低融点金
属）２は、投入ヒーター４によつて加熱され、液
相となつて保持される。投入ヒーター４はヒータ
ー保護管５によつて、溶湯と隔絶されている。６
は溶湯の製錬のためのガス吹込管で、窒素ガス等
を吹き込む。７は溶湯の測温用熱電対を示しこの
熱電対７は熱電対保護管８によつて溶湯から保護
されている。図中１０及び３は絶縁支持材であ
る。 As shown in the drawing, the molten metal (low melting point metal) 2 in the container 1 is heated by the charging heater 4 and held in a liquid phase. The charging heater 4 is isolated from the molten metal by a heater protection tube 5. 6
is a gas injection pipe for smelting molten metal, which injects nitrogen gas, etc. Reference numeral 7 indicates a thermocouple for measuring the temperature of molten metal, and this thermocouple 7 is protected from the molten metal by a thermocouple protection tube 8. In the figure, numerals 10 and 3 are insulating support materials.
実施例 １
見掛け気孔率21％の再結晶質炭化珪素にコロイ
ダルアルミナを含浸焼結し見掛け気孔率19.0％の
再結晶質炭化珪素体を得た。Example 1 Recrystallized silicon carbide having an apparent porosity of 21% was impregnated with colloidal alumina and sintered to obtain a recrystallized silicon carbide body having an apparent porosity of 19.0%.
次いで、かように含浸処理した炭化珪素体の表
面に気相成長法によつて炭化珪素をコーテイング
した。このようにして形成した部材を使用するこ
とにより、従来の鋳鉄製、炭素製或いは炭化珪素
焼結体からなる部材のものと比較してその耐用時
間が数倍に延長できたことを確かめた。 Next, the surface of the silicon carbide body thus impregnated was coated with silicon carbide by vapor phase growth. It was confirmed that by using the member formed in this way, the service life could be extended several times compared to conventional members made of cast iron, carbon, or silicon carbide sintered bodies.
実施例 ２
実施例１に記載すると同様にしてコロイダルア
ルミナを含浸処理した炭化珪素体の表面に窒化珪
素を実施例１と同様に気相成長法によりコーテイ
ングした。かようにして形成した部材は実施例１
におけると同様に耐用時間を延長できたことを確
かめた。Example 2 The surface of a silicon carbide body impregnated with colloidal alumina in the same manner as described in Example 1 was coated with silicon nitride by the vapor phase growth method in the same manner as in Example 1. The member thus formed is Example 1.
It was confirmed that the service life could be extended in the same way as in the previous example.
第１図は本発明の実施例示す概略断面図であ
る。
１……容器、２……溶湯（低融点金属）、３及
び１０……絶縁支持材、４……投入ヒーター、５
……ヒーター保護管、６……ガス吹込管、７……
熱電対、８……熱電対保護管、９……フラツク
ス。
FIG. 1 is a schematic sectional view showing an embodiment of the present invention. 1... Container, 2... Molten metal (low melting point metal), 3 and 10... Insulating support material, 4... Charge heater, 5
... Heater protection tube, 6 ... Gas blowing pipe, 7 ...
Thermocouple, 8...Thermocouple protection tube, 9...Flux.
Claims (1)
珪素体を用い、その気孔にコロイド状アルミナの
充填材を充填し、この充填した炭化珪素体の表面
に気相成長により緻密質炭化珪素又は窒化珪素を
コーテイングすることを特徴とする低融点金属溶
解保持炉用部材の製造方法。1 A recrystallized silicon carbide body having an apparent porosity of 5 to 40% is used, the pores are filled with a filler of colloidal alumina, and dense silicon carbide or A method for manufacturing a member for a low melting point metal melting and holding furnace, characterized by coating with silicon nitride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17280979A JPS5696779A (en) | 1979-12-28 | 1979-12-28 | Member for low melting point metal melt keeping furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17280979A JPS5696779A (en) | 1979-12-28 | 1979-12-28 | Member for low melting point metal melt keeping furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5696779A JPS5696779A (en) | 1981-08-05 |
| JPS6119598B2 true JPS6119598B2 (en) | 1986-05-17 |
Family
ID=15948767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17280979A Granted JPS5696779A (en) | 1979-12-28 | 1979-12-28 | Member for low melting point metal melt keeping furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5696779A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60255255A (en) * | 1984-05-30 | 1985-12-16 | Fujikura Ltd | Bushing member for dip coating forming device |
| JPS62241873A (en) * | 1986-04-14 | 1987-10-22 | 東芝セラミツクス株式会社 | Immersion protective pipe for molten metal |
| JPS62241874A (en) * | 1986-04-14 | 1987-10-22 | 東芝セラミツクス株式会社 | Immersion protective pipe for molten metal |
| JP2550547B2 (en) * | 1986-12-19 | 1996-11-06 | 日産化学工業株式会社 | Modification method of ceramic molded products |
| JPS6442365A (en) * | 1987-08-07 | 1989-02-14 | Tokai Konetsu Kogyo Kk | Production of silicon carbide sintered body of gas impermeability |
| US5456761A (en) * | 1993-07-15 | 1995-10-10 | Alcan International Limited | High temperature and abrasion resistant temperature measuring device |
-
1979
- 1979-12-28 JP JP17280979A patent/JPS5696779A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5696779A (en) | 1981-08-05 |
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