JPS589885A - Silicon nitride sintered formed body - Google Patents
Silicon nitride sintered formed bodyInfo
- Publication number
- JPS589885A JPS589885A JP10589981A JP10589981A JPS589885A JP S589885 A JPS589885 A JP S589885A JP 10589981 A JP10589981 A JP 10589981A JP 10589981 A JP10589981 A JP 10589981A JP S589885 A JPS589885 A JP S589885A
- Authority
- JP
- Japan
- Prior art keywords
- silicon nitride
- nitride sintered
- barium
- formed body
- sintered 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.)
- Pending
Links
- 229910052581 Si3N4 Inorganic materials 0.000 title claims description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims description 9
- 150000001553 barium compounds Chemical class 0.000 claims description 12
- 238000000034 method Methods 0.000 description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 229910000711 U alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- -1 etc. Chemical compound 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は、窒化硅素焼結成形体特にアルミニウム合金溶
解する際に用いる熱電対やランスなどに適した窒化硅素
焼結成形体に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a silicon nitride sintered body, particularly suitable for thermocouples, lances, etc. used in melting aluminum alloys.
本発明において、成形体とは棒状体、管状体、球状体、
板状体などをさすものである。In the present invention, molded bodies include rod-shaped bodies, tubular bodies, spherical bodies,
It refers to a plate-shaped body, etc.
窒化硅素は、熱膨張係数が小さく熱衝撃に優れ熱分解温
度が高く、また特に溶融アルミニウムにぬれにくい等の
性質があるので、その焼結体はアル％％ ニウム溶解用
の耐火材料として注目されている。Silicon nitride has a small coefficient of thermal expansion, excellent thermal shock resistance, a high thermal decomposition temperature, and is particularly difficult to wet with molten aluminum, so its sintered body is attracting attention as a refractory material for melting aluminum. ing.
窒化硅素焼結成形体の製法としては、（１）ホットプレ
ス法（２）反応焼結法（３）雰囲気加工焼結法などが知
られている。これらの方法のうち、経済的に最も有利な
ものは反応焼結法である。これは、金属珪素粉をあらか
じめ成露し、窒素含有雰囲気下で加熱する方法であって
、この方法によって、得られる焼結体は、見掛気孔率が
１０−以上のものしか得られず、例えば、アルミニウム
の溶解時に用いる熱電対の保護管やランスなどに用いる
と、耐久性に劣るという問題があった。Known methods for producing silicon nitride sintered bodies include (1) hot press method, (2) reaction sintering method, and (3) atmosphere processing sintering method. Of these methods, the most economically advantageous is the reactive sintering method. This is a method in which metallic silicon powder is dew-formed in advance and heated in a nitrogen-containing atmosphere, and the sintered body obtained by this method can only have an apparent porosity of 10- or more. For example, when used in thermocouple protection tubes or lances used when melting aluminum, there is a problem of poor durability.
その原因はアルミニウム合金中の添加故秒の一部が酸化
されスラグ状となるが、これが窒化硅素焼結体に存在す
る気孔中に入わ込み、この状況下で急激な温度変化を受
ける時に焼結体表面での熱膨張率の差に原因する応力に
よシ、焼結体表面がチッピングを生じ、ついＫは破壊す
るものと推定される。The cause of this is that part of the added aluminum alloy is oxidized and becomes a slag, which enters the pores existing in the silicon nitride sintered body and sinters when subjected to rapid temperature changes under these conditions. It is presumed that the stress caused by the difference in coefficient of thermal expansion on the surface of the sintered body causes chipping on the surface of the sintered body, and that K is eventually destroyed.
本発明は、こわらの欠点を解決することケ０的とするも
ので、焼結成形体表面または内部の空隙部分和バリウム
化合物を充填することにより、アル１＝ウム合金溶解の
際にこれを熱電対保膿管やランスなど忙使用した時に、
耐久性が向上するというすぐれた効果を有する窒化硅素
焼結成形体を提供しようとするものである。すなわち、
本発明は、表面または内部の空隙部分にバリウム化合物
を充填してなることを特徴とする反応焼結型窒化硅素焼
結体である。The present invention is aimed at solving the drawbacks of stiffness, and by filling the voids on the surface or inside of the sintered compact with a partially summed barium compound, it is possible to use a thermoelectric material during the melting of the Al-1-U alloy. When used for busy purposes such as anti-sugar storage tubes and lances,
The object of the present invention is to provide a silicon nitride sintered molded body that has the excellent effect of improving durability. That is,
The present invention is a reactive sintered silicon nitride sintered body, characterized in that the surface or internal voids are filled with a barium compound.
以下さらに本発明の詳細な説明する。The present invention will be further explained in detail below.
本発明忙おいて、バリウム化合物とけ硫酸バリウム、塩
化バリウム、水酸化バリウムなどの無機バリウム化合物
であり、特忙高温安定な硫酸バリウムが好ましい。バリ
ウム化合物は必らずしも無機７４リウム化合物に制限さ
れるものでなく、ステアリン酸バリウム等の有機バリウ
ム化合物であり。In the present invention, the barium compound is an inorganic barium compound such as barium sulfate, barium chloride, barium hydroxide, etc., and barium sulfate, which is particularly stable at high temperatures, is preferred. Barium compounds are not necessarily limited to inorganic 74ium compounds, but include organic barium compounds such as barium stearate.
てもよい。It's okay.
バリウム化合物の充填方法としては、バリウム化合物を
含む溶液やスラリー等の塗布、あるいは浸漬処理等の種
々の方法が採用することができる。As a method for filling the barium compound, various methods such as coating a solution or slurry containing a barium compound, dipping treatment, etc. can be adopted.
また、反応焼結型壁化硅素焼結体は、一般に見掛気孔率
が６５％〜１０チと大きく変動するが、その見掛気孔率
に限定されることなく使用できる。Further, although the reactive sintered walled silicon sintered body generally has an apparent porosity that varies widely from 65% to 10%, it can be used without being limited to that apparent porosity.
以下実施例によって本発明を具体的に説明する。EXAMPLES The present invention will be specifically explained below using Examples.
実施例
金属硅素粉末１００重量部に、ぼりビニルアルコール５
１を水溶液を３１１重部加え、これをミキサーで混合、
混練した後、温度１００℃で乾燥した後、ポールきルで
粉砕し、粒径２９７μ以下の・粉末とした。これを圧力
１ｏｏｏｋｇ／α２で加圧成形し、１１０Ｘ１０Ｘ１０
０１の直方体とし、これを窒素気流中で加熱、窒化した
。得られた窒化硅素焼結体表面に、各種のバリウム化合
物を塗布し、次いで加熱して揮発分を除去した。Example 100 parts by weight of metal silicon powder, 5 parts by weight of vinyl alcohol
Add 311 parts of an aqueous solution of 1 and mix this with a mixer.
After kneading, the mixture was dried at a temperature of 100° C., and then ground with a pole mill to obtain a powder with a particle size of 297 μm or less. This was pressure-molded at a pressure of 1oookg/α2, and 110X10X10
A rectangular parallelepiped of No. 01 was heated and nitrided in a nitrogen stream. Various barium compounds were applied to the surface of the obtained silicon nitride sintered body, and then heated to remove volatile components.
実用アルζニウム合金に対する耐久性のテストは、温度
７６０℃で鋳造用アルミニウム合金（ＪｌＢ−８Ａ）を
溶融した後、前記試料の一部を浸漬し、２４時間後に引
き出す方法で実施した。The durability test for a practical aluminum ζ alloy was conducted by melting a casting aluminum alloy (JlB-8A) at a temperature of 760°C, immersing a portion of the sample, and pulling it out after 24 hours.
これらの条件とその結果を表に示した。表から明らかな
ように０、バリウム化合物を用いた場合に優れた耐久性
を示す。なお、バリウム化合物として硫酸バリウムを用
いた場合圧一層優れた耐久性を示すことが明らかである
。These conditions and results are shown in the table. As is clear from the table, excellent durability is exhibited when a barium compound is used. It is clear that when barium sulfate is used as the barium compound, even better durability is exhibited.
Claims (1)
なる窒化硅素焼結成形体。A silicon nitride sintered body whose surface or internal voids are filled with a partially summed barium compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10589981A JPS589885A (en) | 1981-07-07 | 1981-07-07 | Silicon nitride sintered formed body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10589981A JPS589885A (en) | 1981-07-07 | 1981-07-07 | Silicon nitride sintered formed body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS589885A true JPS589885A (en) | 1983-01-20 |
Family
ID=14419728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10589981A Pending JPS589885A (en) | 1981-07-07 | 1981-07-07 | Silicon nitride sintered formed body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS589885A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217675A (en) * | 1983-05-25 | 1984-12-07 | 大同特殊鋼株式会社 | Silicon nitride reaction sintered composite material and its manufacturing method |
| JPH02133545U (en) * | 1989-04-12 | 1990-11-06 |
-
1981
- 1981-07-07 JP JP10589981A patent/JPS589885A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217675A (en) * | 1983-05-25 | 1984-12-07 | 大同特殊鋼株式会社 | Silicon nitride reaction sintered composite material and its manufacturing method |
| JPH02133545U (en) * | 1989-04-12 | 1990-11-06 |
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