JPH0656542A - Production of whisker reinforced sintered compact - Google Patents
Production of whisker reinforced sintered compactInfo
- Publication number
- JPH0656542A JPH0656542A JP4237570A JP23757092A JPH0656542A JP H0656542 A JPH0656542 A JP H0656542A JP 4237570 A JP4237570 A JP 4237570A JP 23757092 A JP23757092 A JP 23757092A JP H0656542 A JPH0656542 A JP H0656542A
- Authority
- JP
- Japan
- Prior art keywords
- added
- whiskers
- sintering aid
- sintering
- matrix
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば、各種の炉材や
構造部材として用いられるウィスカー強化焼結体（セラ
ミックス）に関し、さらに詳しくは比較的多量のウィス
カーを添加し、高強度、高靭性ウィスカー強化焼結体を
製造する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to whisker reinforced sintered bodies (ceramics) used as, for example, various furnace materials and structural members. More specifically, a relatively large amount of whiskers is added to provide high strength and high toughness. The present invention relates to a method for producing a whisker reinforced sintered body.
【０００２】[0002]
【従来の技術】ウィスカー強化焼結体の機械的物性の測
定結果が各種報告されている。2. Description of the Related Art Various measurement results of mechanical properties of whisker reinforced sintered bodies have been reported.
【０００３】例えば日本セラミックス協会１９９１年年
会予稿集、Ｐ．４０８等がある。また、ウィスカー強化
セラミックスの成形方法に関し、（株）産業技術サービ
スセンターが１９９１年５月１５日発行「セラミックス
強化複合セラミックス―技術開発動向調査―」のＰ．２
７５に示されている図を図１に示すが従来の焼結助剤と
はマトリックスとなるセラミックス粉末のみで材料設計
されているのが実状である。For example, the 1991 Annual Meeting of the Ceramic Society of Japan, P. There are 408 etc. Regarding the method of forming whisker-reinforced ceramics, the Industrial Technology Service Center Co., Ltd. published on May 15, 1991, "Ceramics Reinforced Composite Ceramics-Technology Development Trend Survey-" Two
The drawing shown in FIG. 75 is shown in FIG. 1, but the actual situation is that the conventional sintering aid is material-designed only with the ceramic powder serving as a matrix.
【０００４】また、一般にウィスカーを添加すると難焼
結性になるためＡｌ2Ｏ3、Ｓｉ3Ｎ4系等でのウィスカー
添加ではホットプレス焼結やＨＩＰ（静水圧加圧焼結）
がおこなわれている。[0004] In general, addition of whiskers makes it difficult to sinter, so that addition of whiskers such as Al 2 O 3 or Si 3 N 4 system results in hot press sintering or HIP (hydrostatic pressure sintering).
Is being carried out.
【０００５】しかし、マトリックスとなるセラミックス
粉末を焼結助剤として得られたウィスカー強化焼結体
は、曲げ強度、破壊靭性において充分とは云い難く、そ
の用途も狭い範囲に限られている。However, the whisker reinforced sintered body obtained by using a ceramic powder as a matrix as a sintering aid is not sufficient in bending strength and fracture toughness, and its use is limited to a narrow range.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、比較的多量
のウィスカーを添加し、高強度、高靭性ウィスカー強化
焼結体を製造するに際して、焼結助剤の適正化、焼結時
間の適正化に関するものである。DISCLOSURE OF THE INVENTION According to the present invention, when a relatively large amount of whiskers is added to produce a high-strength, high-toughness whisker-reinforced sintered body, the sintering aid is optimized and the sintering time is optimized. It is about conversion.
【０００７】[0007]
【課題を解決するための手段】本発明は、 （１）ウィスカーを１５ｖｏｌ％以上添加する焼結体に
おいて、ウィスカー添加量に応じてマトリックス用焼結
助剤を一定比添加することを特徴とするウィスカー強化
焼結体の製造方法。The present invention is characterized in that (1) in a sintered body containing 15 vol% or more of whiskers, a sintering aid for a matrix is added in a fixed ratio according to the amount of whiskers added. Manufacturing method of whisker reinforced sintered body.
【０００８】（２）ウィスカー強化焼結体を製造する際
にホットプレス時間として焼結温度で２時間以上保持し
たことを特徴とするウィスカー強化焼結体の製造方法、
である。(2) A method for producing a whisker-reinforced sintered body, characterized in that the whisker-reinforced sintered body is held at a sintering temperature for 2 hours or more as a hot pressing time in producing the whisker-reinforced sintered body.
Is.
【０００９】本発明の製造フローを図に示す。従来法と
の違いは、焼結助剤をマトリックス単味に添加するので
はなく、ウィスカーに対しても添加することに特徴があ
る。The manufacturing flow of the present invention is shown in the figure. The difference from the conventional method is that the sintering aid is not added to the matrix alone but to the whiskers.
【００１０】例えば従来法では、添加したい焼結助剤の
一部は混合時にウィスカーにも付着し、マトリックスの
緻密化に必要な量が不足する。For example, in the conventional method, a part of the sintering aid to be added adheres to the whiskers at the time of mixing, and the amount required for the densification of the matrix is insufficient.
【００１１】これを補うためにウィスカー添加量をも考
慮してマトリックス組成で添加したのと同等の比でウィ
スカーにも焼結助剤を添加するのが本発明である。In order to make up for this, the present invention is to add the sintering aid to the whiskers at the same ratio as that added in the matrix composition in consideration of the addition amount of whiskers.
【００１２】また、難焼結性であることより、ホットプ
レス時間も３０分ではなく２時間以上にすることが望ま
しい。Further, since it is difficult to sinter, it is desirable that the hot pressing time be not less than 30 minutes but not less than 2 hours.
【００１３】[0013]
【００１４】[0014]
【実施例１】粒径１μｍ以下のＳｉ3Ｎ4粒子に、焼結助
剤として同じく粒径１μｍ以下のＡｌ2Ｏ3とＹ2Ｏ3を各
々５ｗｔ％添加しボールミル中でエタノールを溶媒とし
て湿式混合した原料を作成する。Example 1 5 wt% each of Al 2 O 3 and Y 2 O 3 having a particle size of 1 μm or less as a sintering additive was added to Si 3 N 4 particles having a particle size of 1 μm or less, and ethanol was used as a solvent in a ball mill. Create wet mixed raw materials.
【００１５】次に、直径１μｍ、長さ４０μｍのＳｉＣ
ウィスカーに焼結助剤として同じく粒径１μｍ以下のＡ
ｌ2Ｏ3とＹ2Ｏ3を各々５ｗｔ％添加しボールミル中でエ
タノールを溶媒として湿式混合した原料を作成する。Next, SiC having a diameter of 1 μm and a length of 40 μm
A with a particle size of 1 μm or less as a sintering aid for whiskers
5 wt% each of l 2 O 3 and Y 2 O 3 was added and wet mixed with ethanol as a solvent in a ball mill to prepare a raw material.
【００１６】ついでこの両原料を用いてＳｉ3Ｎ4に対し
てＳｉＣウィスカーを２０ｗｔ％添加し再度ボールミル
中でエタノールを溶媒として湿式混合する。Then, using both these raw materials, 20 wt% of SiC whiskers is added to Si 3 N 4 , and wet mixing is again carried out in a ball mill using ethanol as a solvent.
【００１７】この原料を窒素雰囲気中１７８０℃で３０
分、１時間、２時間、３時間各々４５０ｋｇ／ｃｍ2の
圧力でホットプレスし焼結体を作成した。This raw material was stored in a nitrogen atmosphere at 1780 ° C. for 30 minutes.
Minutes, 1 hour, 2 hours, 3 hours each were hot pressed at a pressure of 450 kg / cm 2 to prepare a sintered body.
【００１８】また、比較例として上述のＳｉ3Ｎ4とＡｌ
2Ｏ3とＹ2Ｏ3の混合粉体に直径１μｍ、長さ４０μｍの
ＳｉＣウィスカーを同じく２０ｗｔ％添加し、上述と同
一の焼成条件で焼結をおこなった。As a comparative example, the above-mentioned Si 3 N 4 and Al
20 wt% of SiC whiskers having a diameter of 1 μm and a length of 40 μm were also added to the mixed powder of 2 O 3 and Y 2 O 3 , and sintering was performed under the same firing conditions as described above.
【００１９】得られた焼結体の物性値を第１表、第２表
に示す。The physical properties of the obtained sintered body are shown in Tables 1 and 2.
【００２０】[0020]
【表１】 [Table 1]
【００２１】従来法で得られた焼結体ではホットプレス
時間を増加しても、嵩比重、曲げ強度、破壊靭性値とも
殆ど変化は認められなかった。In the sintered body obtained by the conventional method, even if the hot pressing time was increased, the bulk specific gravity, the bending strength, and the fracture toughness were hardly changed.
【００２２】[0022]
【表２】 [Table 2]
【００２３】ＳｉＣウィスカーにも焼結助材を添加した
本法では、焼結時間が１時間以下の比較例でも従来法に
比べて曲げ強度や破壊靭性値は増加するが２時間以上の
ホットプレス時間では更に改善され高強度化、高靭性化
が図れた。In the present method in which the sintering aid is added to the SiC whiskers, the bending strength and the fracture toughness value are increased as compared with the conventional method even in the comparative example in which the sintering time is 1 hour or less, but the hot pressing for 2 hours or more. With time, it was further improved and increased strength and toughness were achieved.
【００２４】[0024]
【発明の効果】本発明においては、ウィスカー添加量に
応じてマトリックス用焼結助剤を一定比添加することに
よって高度の曲げ強度、高靭性を有するウィスカー強化
焼結体（セラミックス）を安定的に得ることができる。EFFECTS OF THE INVENTION In the present invention, a sintering aid for a matrix having high bending strength and high toughness (ceramics) is stably prepared by adding a sintering aid for a matrix in a constant ratio according to the amount of whiskers added. Obtainable.
【図１】ウィスカー強化セラミックスの製造プロセス例
のフローチャートを示す図。FIG. 1 is a diagram showing a flowchart of an example of a manufacturing process of whisker-reinforced ceramics.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石井 信也 姫路市広畑区富士町１番地 新日本製鐵株 式会社広畑製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Ishii 1 Fuji-machi, Hirohata-ku, Himeji City Nippon Steel Co., Ltd. Hirohata Works
Claims (2)
焼結体において、ウィスカー添加量に応じてマトリック
ス用焼結助剤を一定比添加することを特徴とするウィス
カー強化焼結体の製造方法。1. A method for producing a whisker-reinforced sintered body, which comprises adding a sintering aid for a matrix in a constant ratio to a sintered body containing 15 vol% or more of whiskers according to the amount of whiskers added.
ットプレス時間として焼結温度で２時間以上保持したこ
とを特徴とするウィスカー強化焼結体の製造方法。2. A method for producing a whisker reinforced sintered body, characterized in that the whisker reinforced sintered body is held at a sintering temperature for 2 hours or more as a hot pressing time when the whisker reinforced sintered body is produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4237570A JPH0656542A (en) | 1992-08-14 | 1992-08-14 | Production of whisker reinforced sintered compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4237570A JPH0656542A (en) | 1992-08-14 | 1992-08-14 | Production of whisker reinforced sintered compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0656542A true JPH0656542A (en) | 1994-03-01 |
Family
ID=17017277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4237570A Withdrawn JPH0656542A (en) | 1992-08-14 | 1992-08-14 | Production of whisker reinforced sintered compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0656542A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109320256A (en) * | 2017-08-01 | 2019-02-12 | 张家港市五湖新材料技术开发有限公司 | A kind of silicon nitride-silicon carbide ceramic composite and preparation method thereof |
| CN114133246A (en) * | 2021-12-01 | 2022-03-04 | 湖南湘瓷科艺有限公司 | Based on carbon-based and ceramic-based composites |
-
1992
- 1992-08-14 JP JP4237570A patent/JPH0656542A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109320256A (en) * | 2017-08-01 | 2019-02-12 | 张家港市五湖新材料技术开发有限公司 | A kind of silicon nitride-silicon carbide ceramic composite and preparation method thereof |
| CN114133246A (en) * | 2021-12-01 | 2022-03-04 | 湖南湘瓷科艺有限公司 | Based on carbon-based and ceramic-based composites |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19991102 |