JPS63190786A - Coated silicon nitride base ceramics and manufacture - Google Patents
Coated silicon nitride base ceramics and manufactureInfo
- Publication number
- JPS63190786A JPS63190786A JP62020029A JP2002987A JPS63190786A JP S63190786 A JPS63190786 A JP S63190786A JP 62020029 A JP62020029 A JP 62020029A JP 2002987 A JP2002987 A JP 2002987A JP S63190786 A JPS63190786 A JP S63190786A
- Authority
- JP
- Japan
- Prior art keywords
- silicon nitride
- resistance
- coated silicon
- manufacture
- molded 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
- 239000000919 ceramic Substances 0.000 title claims description 24
- 229910052581 Si3N4 Inorganic materials 0.000 title claims description 22
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000843 powder Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 230000003628 erosive effect Effects 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000003112 inhibitor Substances 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910005091 Si3N Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010128 melt processing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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】
〔産業上の利用分野〕
本発明は、表面に被覆層を有する窒化珪素系セラミック
スおよびその製造方法に関し、溶融体処理用治具、熱間
加工用治具、その他高温断熱、遮断用材等に用いられて
有効な被覆窒化珪素系セラミックスとその製造方法に関
するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to silicon nitride ceramics having a coating layer on the surface and a method for producing the same, and relates to jigs for melt processing, jigs for hot working, and other high-temperature processing jigs. The present invention relates to coated silicon nitride ceramics that are effective for use as heat insulating, barrier materials, etc., and a method for producing the same.
サイアロンセラミックス等の窒化珪素系セラミックスは
、耐食性、耐摩耗性、耐溶損性に優れているところから
熱間加工用工具、溶湯用治具等の分野に用いられつつあ
る。Silicon nitride ceramics such as Sialon ceramics are being used in fields such as hot working tools and jigs for molten metal because of their excellent corrosion resistance, wear resistance, and erosion resistance.
しかし、溶湯用治具等では、高温で使用するために、さ
らに耐食性、耐酸化性、耐溶損性が望まれている。However, since molten metal jigs and the like are used at high temperatures, corrosion resistance, oxidation resistance, and erosion resistance are desired.
本発明は、以上の問題に対し、従来の窒化珪素系セラミ
ックスよりさらに耐食性、耐酸化性、耐溶損性の向上を
はかった窒化珪素系セラミックスおよびその製造方法の
提供を目的とする。SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide silicon nitride ceramics that have higher corrosion resistance, oxidation resistance, and erosion resistance than conventional silicon nitride ceramics, and a method for manufacturing the same.
本発明は、窒化珪素系セラミックスの表面にＢＮを主体
とする層を有することを特徴とする被覆窒化珪素系セラ
ミックス、および窒化珪素系セラミックス成形体をＢＮ
粉末中に埋没させておき、前記成形体を焼結すると同時
に表面にＢＮを主体とする層を形成することを特徴とす
る被覆窒化珪素系セラミックスの製造方法である。The present invention provides a coated silicon nitride ceramic characterized by having a layer mainly composed of BN on the surface of the silicon nitride ceramic, and a silicon nitride ceramic molded body made of BN.
This is a method for manufacturing coated silicon nitride ceramics, which comprises immersing the molded body in powder, sintering the molded body, and at the same time forming a layer mainly composed of BN on the surface.
本発明者は、窒化珪素系セラミックスの耐食性、耐酸化
性の向上を図るべく種々検討を重ねた結果。The present inventor conducted various studies to improve the corrosion resistance and oxidation resistance of silicon nitride ceramics.
後述する実施例に示す如く、ＢＮを主体とする層を設け
ることが有効であり、また前記層は焼結と同時に形成す
ることができることを知見し、本発明を完成した。As shown in the Examples described below, it was found that it is effective to provide a layer mainly composed of BN, and that the layer can be formed simultaneously with sintering, and the present invention was completed.
本発明方法は、所定の原料粉末を混合、成形して得られ
た窒化珪素系セラミックス成形体をＢＮ粉末中に埋没さ
せておき、この状態で前記成形体を焼結すると同時にＢ
Ｎを主体とする層を形成せしめるのである。ここで、通
常窒化珪素系セラミックスを焼結するに際し、Ｓｉ３Ｎ
、の分解防止の ・ために窒化珪素系セラミックス成形
体を粉末状の５Ｌ３Ｎ、等の分解防止剤中に埋没させつ
つ焼結する。したがって本発明法を実施するにあたって
は、ＢＮ粉末と前記分解防止剤の混合物中に前記成形体
を埋没させて焼結、層形成を行うものである。In the method of the present invention, a silicon nitride ceramic molded body obtained by mixing and molding predetermined raw material powders is buried in BN powder, and at the same time, the molded body is sintered in this state.
This forms a layer mainly composed of N. Here, when sintering silicon nitride ceramics, Si3N
In order to prevent the decomposition of , the silicon nitride ceramic molded body is sintered while being embedded in a decomposition inhibitor such as powdered 5L3N. Therefore, in carrying out the method of the present invention, the molded body is immersed in a mixture of the BN powder and the decomposition inhibitor to perform sintering and layer formation.
なお、ＢＮ粉末と分解防止剤の混合比率は、ＢＮ粉末が
１０〜５０ｖｔ％、残部分解防止剤とすれば良い。Note that the mixing ratio of the BN powder and the decomposition inhibitor may be such that the BN powder is 10 to 50 vt%, and the remainder is the decomposition inhibitor.
ＢＮがＬｏｕｔ％未満では十分な層形成が達成されず、
また５０ｗｔ％を越えるとＳｉ、Ｎ４の分解防止がなさ
れなくなるためである。If BN is less than Lout%, sufficient layer formation will not be achieved,
Moreover, if it exceeds 50 wt%, the decomposition of Si and N4 cannot be prevented.
本願発明における窒化珪素セラミックスを実施例に基づ
いて説明する。The silicon nitride ceramic according to the present invention will be explained based on Examples.
８１３ Ｎ ４ （平均粒径０．３ μｍ、 ａ化率９
０％）、Ａｌ□Ｏ。813 N 4 (average particle size 0.3 μm, a conversion rate 9
0%), Al□O.
（平均粒径０．３ ｐ ｖａ、 ａ化率９９０ｇ％）、
ＡＩＮ固溶体（平均粒径３μｌ１１）、Ｙ ２０３ （
平均粒径１０ μｍ、 ａ化率９９．９９％）を一般式
Ｓ ｉ６−Ｚ Ａ ｌｚ Ｏｚ Ｎ ｓ−ｚでＺ＝０．
５の組成となるようにし、高純度、アルミナを媒体とし
てエチルアルコール中でボールミルを行ったのち乾燥し
、ＣｉＰ成形を行なった。得られたサイアロン成形体を
脱脂後、Ｓｉ、Ｎ４を主体とする分解防止剤８０ｗｔ％
、ＢＮ粉２０ｗｔ％の割合で混合したものに前記サイア
ロン成形体を埋没せしめ窒素ガス中１７００℃Ｘ ４Ｈ
ｒで焼結し、サイアロン焼結体表面にＢＮを主体とする
被覆層を形成させたサイアロンセラミックスを製造し、
耐食性、耐酸化性、耐アルミナ溶損性についてテストし
、比較材（被覆ナシ）と比較した。第１表に耐食性（特
に耐酸性）、第２表に耐酸化性を示す。(average particle size 0.3 p va, a conversion rate 990 g%),
AIN solid solution (average particle size 3 μl11), Y 203 (
average particle diameter 10 μm, a conversion rate 99.99%) using the general formula S i6-Z Alz Oz N s-z where Z=0.
After ball milling in ethyl alcohol using high-purity alumina as a medium, it was dried and CiP molded. After degreasing the obtained sialon molded body, 80wt% of a decomposition inhibitor mainly composed of Si and N4 was added.
The sialon molded body was buried in a mixture of BN powder at a ratio of 20 wt% and heated at 1700°C for 4 hours in nitrogen gas.
Sialon ceramics are produced by sintering with r to form a coating layer mainly composed of BN on the surface of the Sialon sintered body,
Corrosion resistance, oxidation resistance, and alumina erosion resistance were tested and compared with a comparison material (without coating). Table 1 shows corrosion resistance (especially acid resistance), and Table 2 shows oxidation resistance.
第 １ 表 耐食性（４０℃Ｘ ２４０ｈｒ）第 ２
表
耐溶損性については、クランク型浸漬装置１！１を用い
て概略第１図に示す方法でＡ１溶湯２に上記本発明材で
あるＢＮ被覆サイアロン３および被覆ナシサイアロン４
（比較材）を浸漬し、９０ｒｐｍでクランク型浸漬装置
１を回転させ、１２時間の試験でＡ１溶湯との反応性を
確認した。Ａ１溶湯の温度は６５０℃に保持した。その
結果、比較材はＡ１溶湯と反応するのに対し、本発明材
はほとんど反応しなかった。Table 1 Corrosion resistance (40℃ x 240hr) 2nd
Regarding the surface erosion resistance, the BN-coated Sialon 3 and uncoated Sialon 4, which are the materials of the present invention, were added to the A1 molten metal 2 using a crank-type dipping device 1!1 in the method schematically shown in FIG.
(comparative material) was immersed, the crank-type immersion device 1 was rotated at 90 rpm, and the reactivity with the A1 molten metal was confirmed in a 12-hour test. The temperature of the A1 molten metal was maintained at 650°C. As a result, while the comparative material reacted with the A1 molten metal, the present invention material hardly reacted.
以上の結果より、耐食性、耐酸化性、耐溶損性（溶融金
属との反応性）に効果があることがわかった。From the above results, it was found that it is effective in corrosion resistance, oxidation resistance, and erosion resistance (reactivity with molten metal).
以上説明のように本発明によると、窒化珪素系セラミッ
クスの耐食性、耐酸化性、耐溶損性を向上させることが
可能となり、溶融体処理用治具、熱間加工用治具、その
他高温断熱、遮蔽用材料等に適用した場合、耐久性も向
上し工業上有益である。As explained above, according to the present invention, it is possible to improve the corrosion resistance, oxidation resistance, and erosion resistance of silicon nitride ceramics, and it is possible to improve the corrosion resistance, oxidation resistance, and erosion resistance of silicon nitride ceramics, and to improve the corrosion resistance, oxidation resistance, and erosion resistance of silicon nitride ceramics. When applied to shielding materials, etc., it improves durability and is industrially useful.
第１図は、耐溶損性の評価方法概略を示す図である。 FIG. 1 is a diagram schematically showing a method for evaluating erosion resistance.
Claims (1)
層を有することを特徴とする被覆窒化珪素系セラミック
ス。 ２ 窒化珪素系セラミックス成形体をＢＮ粉末中に埋没
させておき、前記成形体を焼結すると同時に表面にＢＮ
を主体とする層を形成することを特徴とする被覆窒化珪
素系セラミックスの製造方法。[Scope of Claims] 1. A coated silicon nitride ceramic characterized by having a layer mainly composed of BN on the surface of the silicon nitride ceramic. 2 A silicon nitride ceramic molded body is buried in BN powder, and at the same time as the molded body is sintered, BN is added to the surface.
A method for producing coated silicon nitride ceramics, the method comprising forming a layer mainly consisting of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62020029A JPS63190786A (en) | 1987-01-30 | 1987-01-30 | Coated silicon nitride base ceramics and manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62020029A JPS63190786A (en) | 1987-01-30 | 1987-01-30 | Coated silicon nitride base ceramics and manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63190786A true JPS63190786A (en) | 1988-08-08 |
Family
ID=12015644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62020029A Pending JPS63190786A (en) | 1987-01-30 | 1987-01-30 | Coated silicon nitride base ceramics and manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63190786A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01157487A (en) * | 1987-12-11 | 1989-06-20 | Koransha Co Ltd | Complex nitride ceramics |
| JPH01176289A (en) * | 1987-12-29 | 1989-07-12 | Hitachi Metals Ltd | Member for molten aluminum and production thereof |
| JPH02153865A (en) * | 1988-12-03 | 1990-06-13 | Ngk Spark Plug Co Ltd | Silicon nitride sintered compact |
| JPH02263778A (en) * | 1989-04-05 | 1990-10-26 | Isuzu Ceramics Kenkyusho:Kk | Ceramic composite structural body and its production |
-
1987
- 1987-01-30 JP JP62020029A patent/JPS63190786A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01157487A (en) * | 1987-12-11 | 1989-06-20 | Koransha Co Ltd | Complex nitride ceramics |
| JPH01176289A (en) * | 1987-12-29 | 1989-07-12 | Hitachi Metals Ltd | Member for molten aluminum and production thereof |
| JPH02153865A (en) * | 1988-12-03 | 1990-06-13 | Ngk Spark Plug Co Ltd | Silicon nitride sintered compact |
| JPH02263778A (en) * | 1989-04-05 | 1990-10-26 | Isuzu Ceramics Kenkyusho:Kk | Ceramic composite structural body and its production |
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