JPH0521042B2 - - Google Patents
Info
- Publication number
- JPH0521042B2 JPH0521042B2 JP60183473A JP18347385A JPH0521042B2 JP H0521042 B2 JPH0521042 B2 JP H0521042B2 JP 60183473 A JP60183473 A JP 60183473A JP 18347385 A JP18347385 A JP 18347385A JP H0521042 B2 JPH0521042 B2 JP H0521042B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- oxide ceramic
- firing
- mold
- hollow body
- 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
- 229910052575 non-oxide ceramic Inorganic materials 0.000 claims description 24
- 239000011225 non-oxide ceramic Substances 0.000 claims description 24
- 238000010304 firing Methods 0.000 claims description 23
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000012298 atmosphere Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims 1
- 239000000919 ceramic Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011505 plaster Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007582 slurry-cast process Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Landscapes
- Moulds, Cores, Or Mandrels (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、成形後の焼成工程において焼成収縮
を起こさない再結晶SiC又は反応焼結Si3N4から
なる非酸化物セラミツク中空体の製造に好適な、
カーボン質の中子を用いた非酸化物セラミツク中
空体の製造方法に関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention is directed to the production of non-oxide ceramic hollow bodies made of recrystallized SiC or reaction-sintered Si 3 N 4 that do not undergo firing shrinkage in the firing process after molding. suitable for
The present invention relates to a method for manufacturing a non-oxide ceramic hollow body using a carbonaceous core.
（従来の技術）
第４図に示すようなパイプ状のセラミツク中空
体や第７図に示すような複雑な内部形状を持つセ
ラミツク中空体を製造するには、金属、石膏等か
らなる中子を用いてスラリーを鋳込成形する方法
が普通であり、再結晶SiCや反応焼結Si3N4等の
非酸化物セラミツクを原料とした場合も同様であ
る。しかし、成形型から取出した成形品を中子を
付けたままで焼成すると中子が成形品と反応した
り中子が熱分解して焼成雰囲気が変化し、所定の
特性の製品が得られなくなるため、焼成前に中子
を成形品から除去する必要があつた。このため、
中子が可溶性のものであるときには中子を溶かし
て除去しているが、このとき成形品が破損し易い
欠点があつた。またパイプ状の成形品の場合には
中子を引抜くことも可能であるが、長尺品の場合
にはやはり破損を生じ易く、更にまた中子のない
状態で焼成するために焼成時に反りや変形を生ず
ることがある欠点もあつた。(Prior Art) In order to manufacture a pipe-shaped ceramic hollow body as shown in Fig. 4 or a ceramic hollow body with a complicated internal shape as shown in Fig. 7, a core made of metal, gypsum, etc. is used. A common method is to cast a slurry using a ceramic material, and the same is true when non-oxide ceramics such as recrystallized SiC or reaction-sintered Si 3 N 4 are used as raw materials. However, if the molded product taken out of the mold is fired with the core still attached, the core may react with the molded product or the core may thermally decompose, changing the firing atmosphere and making it impossible to obtain a product with the desired characteristics. , it was necessary to remove the core from the molded product before firing. For this reason,
When the core is soluble, it is removed by melting it, but this has the disadvantage that the molded product is easily damaged. In addition, in the case of pipe-shaped molded products, it is possible to pull out the core, but in the case of long products, breakage is likely to occur, and furthermore, since the product is fired without a core, it may warp during firing. There were also drawbacks such as deformation and deformation.
（発明が解決しようとする問題点）
本発明は上記のような従来の問題点を解消し
て、中子を成形品から除去することによる成形品
の破損や焼成時の反り、変形等を防止し、しかも
中子の熱分解等による成形品への悪影響をなくし
た非酸化物セラミツク中空体の製造方法を目的と
して完成されたものである。(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and prevents damage to the molded product, warping, deformation, etc. during firing due to the removal of the core from the molded product. However, this method was completed with the aim of producing a non-oxide ceramic hollow body that eliminates the adverse effects on molded products caused by thermal decomposition of the core.
（問題点を解決するための手段）
本発明は、焼成収縮のない再結晶SiC又は反応
焼結Si3N4からなる非酸化物セラミツク中空体を
鋳込成形法により製造する方法であつて、成形型
にカーボン質の中子をセツトした後、上記の非酸
化物セラミツクスラリーを鋳込成形し、成形品を
成形型から取出して乾燥させたうえ中子付きのま
ま非酸化性の雰囲気炉中で焼成し、その後カーボ
ン質の中子を焼成品から取除くことを特徴とする
ものである。(Means for Solving the Problems) The present invention is a method for manufacturing a non-oxide ceramic hollow body made of recrystallized SiC or reaction-sintered Si 3 N 4 without firing shrinkage by a casting method, comprising: After setting the carbon core in the mold, the above non-oxide ceramic slurry was cast and molded, the molded product was taken out from the mold, dried, and placed in a non-oxidizing atmosphere furnace with the core still attached. This is characterized by the fact that the carbon core is removed from the fired product.
上記のように、本発明は焼成収縮のない再結晶
SiC又は反応焼結Si3N4からなる非酸化物セラミ
ツク中空体の製造方法に関するもので、非酸化物
セラミツクであつても緻密質SiCや緻密質Si3N4
は焼成により大きく収縮するために、本発明の対
象からは除外される。 As mentioned above, the present invention provides recrystallization without firing shrinkage.
This relates to a method for manufacturing a non-oxide ceramic hollow body made of SiC or reaction-sintered Si 3 N 4 , and even if it is a non-oxide ceramic, dense SiC or dense Si 3 N 4
is excluded from the scope of the present invention because it shrinks significantly upon firing.
本発明において用いられるカーボン質の中子は
非酸化性の雰囲気中においては高温度でも安定な
ものであり、再結晶SiC又は反応焼結Si3N4から
なる非酸化物セラミツク成形品を焼成する際にそ
の特性に影響を与えることがなく、また酸化性の
雰囲気中で加熱すれば焼失して容易に除去するこ
とができる利点を有するものである。なお、中子
の形状が焼成品から引抜くことができるものであ
る場合には必ずしも中子を焼失させる必要はな
く、中子を焼成品から取除く手段は特に限定され
るものではない。 The carbonaceous core used in the present invention is stable even at high temperatures in a non-oxidizing atmosphere, and is suitable for firing non-oxide ceramic molded products made of recrystallized SiC or reaction-sintered Si 3 N 4 . It has the advantage that it does not affect its properties and can be burned out and easily removed by heating in an oxidizing atmosphere. Note that if the shape of the core is such that it can be pulled out from the fired product, it is not necessarily necessary to burn out the core, and the means for removing the core from the fired product is not particularly limited.
（実施例） 次に本発明の好ましい実施例を示す。(Example) Next, preferred embodiments of the present invention will be shown.
実施例 １
第１図に示すように石膏製の成形型１の内部に
カーボン質の中子２をセツトし、平均粒径10μの
金属シリコン100重量部に１部の助剤と30部の水
と0.5部の解膠剤とをトロンメルで混合した非酸
化物セラミツクスラリー３を注入した。これを必
要に応じて0.5〜３Kg／cm2の圧縮空気より加圧し
て成形型１の内表面に非酸化物セラミツクスラリ
ー３を着肉させ、得られた成形体４を第２図に示
すように中子２を付けたまま成形型１から取出し
た。次にこれを40〜100℃で約15時間乾燥したう
えで第３図のように中子２付きのままN2ガス雰
囲気炉５中にセツトし、1400℃で焼成した。この
結果、金属シリコンはN2ガスと反応して焼成収
縮のない非酸化物セラミツクであるSi3N4に変化
するが、カーボン質の中子２はこの反応に全く関
与することがない。またこの反応の際に成形体４
には焼成収縮が生じないので焼成中に中子２が破
壊されることがないうえ、焼成完了後にはカーボ
ン質の中子２を焼成品から容易に引抜くことがで
き、第４図に示すとおりのパイプ状の非酸化物セ
ラミツク中空体６が得られた。中子２を除去する
際には焼成品は十分に大きい強度を持つので破壊
されることがなく、また中子２付きのまま焼成さ
れるので反りや変形を生ずることもなく、寸法精
度に優れた非酸化物セラミツク中空体６が得られ
た。Example 1 As shown in Fig. 1, a carbon core 2 was set inside a mold 1 made of plaster, and 100 parts by weight of metal silicon with an average particle size of 10μ, 1 part of an auxiliary agent and 30 parts of water were added. Non-oxide ceramic slurry 3, which was prepared by mixing 0.5 part of deflocculant with a trommel, was injected. This is pressurized with compressed air of 0.5 to 3 kg/cm 2 as necessary to deposit non-oxide ceramic slurry 3 on the inner surface of mold 1, and the obtained molded product 4 is as shown in FIG. was taken out from the mold 1 with the core 2 still attached. Next, this was dried at 40 to 100°C for about 15 hours, and then set in a N2 gas atmosphere furnace 5 with the core 2 attached as shown in FIG. 3, and fired at 1400°C. As a result , the metallic silicon reacts with the N2 gas and changes into Si3N4 , which is a non-oxide ceramic that does not shrink during firing, but the carbonaceous core 2 does not participate in this reaction at all. Also, during this reaction, the molded body 4
Since no firing shrinkage occurs during firing, the core 2 is not destroyed during firing, and after firing is completed, the carbon core 2 can be easily pulled out from the fired product, as shown in Figure 4. A pipe-shaped non-oxide ceramic hollow body 6 was obtained. When removing the core 2, the fired product has sufficient strength so it will not be destroyed, and since it is fired with the core 2 still attached, it will not warp or deform, and has excellent dimensional accuracy. A non-oxide ceramic hollow body 6 was obtained.
実施例 ２
第５図に示すように石膏製の成形型１の内部に
カーボン質の中子２をセツトし、粒径１mm以下の
SiC 100部に解膠剤0.2部、水20部とを加えて15時
間トロンメル混合した非酸化物セラミツクスラリ
ー３を注入し、排泥鋳込法により鋳込成形した。
得られた成形体４を中子２付きのまま成形型１か
ら取出し、40〜100℃で15時間乾燥したうえ第６
図のようにアルゴン雰囲気炉５中にセツトし、
2300℃で２時間焼成した。この焼成により焼成収
縮のほとんどない非酸化物セラミツクである再結
晶SiCからなる焼成品が得られたが、カーボン質
の中子２はSiCの再結晶に何ら影響を与えること
がない。次に中子２付きの焼成品を酸化性雰囲気
中において500℃以上に加熱すれば、カーボン質
の中子２は焼失して第７図に示すような再結晶
SiCからなる非酸化物セラミツク中空体６が得ら
れた。本実施例においては、中子２は焼失させる
方法により焼成品から除去されるので、図示のよ
うに中子２を引抜きが不可能な形状のものとして
おくことができ、任意の形状の非酸化物セラミツ
ク中空体６を製造することができる。Example 2 As shown in Fig. 5, a carbon core 2 was set inside a mold 1 made of plaster, and a carbon core 2 with a particle size of 1 mm or less was placed inside a mold 1 made of plaster.
Non-oxide ceramic slurry 3, which was prepared by adding 100 parts of SiC, 0.2 parts of deflocculant, and 20 parts of water and trommel-mixing the mixture for 15 hours, was injected and molded by casting using the slurry casting method.
The obtained molded body 4 was taken out from the mold 1 with the core 2 still attached, dried at 40 to 100°C for 15 hours, and then
Set it in the argon atmosphere furnace 5 as shown in the figure,
It was baked at 2300°C for 2 hours. Through this firing, a fired product made of recrystallized SiC, which is a non-oxide ceramic with almost no shrinkage during firing, was obtained, but the carbonaceous core 2 has no effect on the recrystallization of SiC. Next, if the fired product with the core 2 is heated to 500°C or higher in an oxidizing atmosphere, the carbonaceous core 2 will be burned out and recrystallized as shown in Figure 7.
A non-oxide ceramic hollow body 6 made of SiC was obtained. In this example, since the core 2 is removed from the fired product by burning out the core 2, it is possible to leave the core 2 in a shape that cannot be pulled out as shown in the figure. A ceramic hollow body 6 can be produced.
（発明の効果）
本発明は以上の説明から明らかなように、カー
ボン質の中子がセツトされた成形型を用いて、再
結晶SiC又は反応焼結Si3N4を得るための非酸化
物セラミツクスラリーを鋳込成形するとともに、
中子付きのまま雰囲気炉中で焼成して焼成後に中
子を取除くようにしたものであるから、中子を焼
成前に除去することに伴なう成形品の破損を防止
することができるうえ、中子の焼成時における反
り変形を防止して寸法精度の良い非酸化物セラミ
ツク中空体を得ることができるものである。しか
もカーボン質の中子は化学的に極めて安定で非酸
化性の雰囲気炉中においては成形品の焼成に影響
を及ぼすことがなく、所定の特性のセラミツク中
空体を得ることができる。本発明は焼成収縮を起
さない再結晶SiC又は反応焼結Si3N4からなる非
酸化物セラミツク中空体の製造に好適なものであ
り、従来の欠点を解消したカーボン質の中子を用
いた非酸化物セラミツク中空体の製造方法とし
て、産業の発展に寄与するところは極めて大であ
る。(Effects of the Invention) As is clear from the above description, the present invention uses a mold in which a carbonaceous core is set to produce a non-oxide material for obtaining recrystallized SiC or reaction sintered Si 3 N 4 . While casting ceramic slurry,
Since the product is fired in an atmospheric furnace with the core still attached and the core is removed after firing, damage to the molded product that would be caused by removing the core before firing can be prevented. Moreover, it is possible to prevent warping and deformation of the core during firing, thereby obtaining a non-oxide ceramic hollow body with good dimensional accuracy. Moreover, the carbonaceous core is chemically extremely stable and does not affect the firing of the molded product in a non-oxidizing atmosphere furnace, making it possible to obtain a ceramic hollow body with predetermined characteristics. The present invention is suitable for manufacturing non-oxide ceramic hollow bodies made of recrystallized SiC or reaction-sintered Si 3 N 4 that does not undergo firing shrinkage, and uses a carbonaceous core that eliminates the conventional drawbacks. As a manufacturing method for non-oxide ceramic hollow bodies, it will greatly contribute to the development of industry.
第１図〜第４図は本発明の第１の実施例の製造
工程を示す一部切欠正面図、第５図〜第７図は第
２の実施例の製造工程を示す断面図である。
１：成形型、２：中子、３：非酸化物セラミツ
クスラリー、５：雰囲気炉。
1 to 4 are partially cutaway front views showing the manufacturing process of the first embodiment of the present invention, and FIGS. 5 to 7 are sectional views showing the manufacturing process of the second embodiment. 1: Molding mold, 2: Core, 3: Non-oxide ceramic slurry, 5: Atmospheric furnace.
Claims (1)
Si3N4からなる非酸化物セラミツク中空体を鋳込
成形法により製造する方法であつて、成形型にカ
ーボン質の中子をセツトした後、上記の非酸化物
セラミツクスラリーを鋳込成形し、成形品を成形
型から取出して乾燥させたうえ中子付きのまま非
酸化性の雰囲気炉中で焼成し、その後カーボン質
の中子を焼成品から取除くことを特徴とするカー
ボン質の中子を用いた非酸化物セラミツク中空体
の製造方法。1 Recrystallized SiC or reactive sintering without firing shrinkage
A method of manufacturing a non-oxide ceramic hollow body made of Si 3 N 4 by a casting method, in which a carbonaceous core is set in a mold, and then the above-mentioned non-oxide ceramic slurry is cast. , the molded product is removed from the mold, dried, and fired in a non-oxidizing atmosphere furnace with the core attached, and then the carbon core is removed from the fired product. A method for manufacturing a non-oxide ceramic hollow body using a ceramic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18347385A JPS6242802A (en) | 1985-08-21 | 1985-08-21 | Manufacture of ceramic hollow body using carbonaceous core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18347385A JPS6242802A (en) | 1985-08-21 | 1985-08-21 | Manufacture of ceramic hollow body using carbonaceous core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6242802A JPS6242802A (en) | 1987-02-24 |
| JPH0521042B2 true JPH0521042B2 (en) | 1993-03-23 |
Family
ID=16136409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18347385A Granted JPS6242802A (en) | 1985-08-21 | 1985-08-21 | Manufacture of ceramic hollow body using carbonaceous core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6242802A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3704433B2 (en) * | 1998-08-31 | 2005-10-12 | 京セラ株式会社 | Powder pressing method |
| JP2002216626A (en) * | 2001-01-19 | 2002-08-02 | Matsushita Electric Ind Co Ltd | Manufacturing method of arc tube |
| NO334256B1 (en) * | 2009-04-23 | 2014-01-20 | Saint Gobain Ind Keramik Rodental Gmbh | Process for the preparation of ceramic mold part of reaction-bound silicon nitride, apparatus and use thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5964198A (en) * | 1982-10-04 | 1984-04-12 | Nanba Press Kogyo Kk | Production of granular structure |
-
1985
- 1985-08-21 JP JP18347385A patent/JPS6242802A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5964198A (en) * | 1982-10-04 | 1984-04-12 | Nanba Press Kogyo Kk | Production of granular structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6242802A (en) | 1987-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |