JPH01129948A - Low-shrinkage ceramics - Google Patents
Low-shrinkage ceramicsInfo
- Publication number
- JPH01129948A JPH01129948A JP62290278A JP29027887A JPH01129948A JP H01129948 A JPH01129948 A JP H01129948A JP 62290278 A JP62290278 A JP 62290278A JP 29027887 A JP29027887 A JP 29027887A JP H01129948 A JPH01129948 A JP H01129948A
- Authority
- JP
- Japan
- Prior art keywords
- ceramics
- shrinkage
- powder
- metal powder
- time
- 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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は低収縮セラミックスに関する。[Detailed description of the invention] (Industrial application field) This invention relates to low shrinkage ceramics.
（従来技術）
従来、酸化物セラミックスを作る場合、原料となる酸化
物粉末にバインダを加え、射出成形、押し出し成形およ
び金型成形などによって成形され、この成形物が焼成さ
れて酸化物セラミックスが形成される。(Prior art) Conventionally, when making oxide ceramics, a binder is added to the raw material oxide powder, and the molded product is molded by injection molding, extrusion molding, mold molding, etc., and this molded product is fired to form oxide ceramics. be done.
（発明が解決しようとする問題点）
しかしながら、成形物を焼成するとき、脱バインダが行
われるため、出来上がったセラミックスは焼成前に比べ
て１０〜２０％収縮してしまう。(Problems to be Solved by the Invention) However, when the molded product is fired, the binder is removed, so the finished ceramic shrinks by 10 to 20% compared to before firing.
そのため、予め大きめに成形物を形成し、焼成した後機
械加工や放電加工によってセラミックスの寸法を調整し
ている。ところが、セラミックスに機械加工や放電加工
を行うと、セラミックスの特性が変化してしまうという
欠点がある。さらに、このような機械加工や放電加工を
行わなければならないために、セラミックスのコストア
ップにつながっている。Therefore, the dimensions of the ceramic are adjusted by forming a larger molded product in advance, firing it, and then machining or electrical discharge machining. However, when ceramics are subjected to machining or electric discharge machining, the characteristics of the ceramics change. Furthermore, the necessity of performing such machining and electrical discharge machining increases the cost of ceramics.
それゆえに、この発明の主たる目的は、成形物を焼成し
ても収縮率が小さく、かつ低コストの低収縮セラミック
スを提供することである。Therefore, the main object of the present invention is to provide a low-shrinkage ceramic that has a small shrinkage rate even after firing a molded product and is inexpensive.
（問題点を解決するための手段）
この発明は、金属粉末を５〜８０重量％と、酸化物粉末
を２０〜９５重量％とを含む、低収縮セラミックスであ
る。(Means for Solving the Problems) The present invention is a low-shrinkage ceramic containing 5 to 80% by weight of metal powder and 20 to 95% by weight of oxide powder.
（作用）
金属粉末を５〜８０重量％と、酸化物粉末を２０〜９５
重量％とを含む成形物を焼成するときに、酸化物粉末か
ら酸素が取り除かれることによって、酸化物粉末が収縮
する。さらに、このような成形物を焼成するときに、金
属粉末と酸素とが結合することによって、金属粉末が膨
張する。(Function) 5 to 80% by weight of metal powder and 20 to 95% of oxide powder
% by weight, the oxide powder shrinks due to the removal of oxygen from the oxide powder. Furthermore, when such a molded article is fired, the metal powder expands due to the combination of the metal powder and oxygen.
（発明の効果）
この発明によれば、酸化物粉末が収縮し、かつ金属粉末
が膨張するため、全体として成形物を焼成することによ
る収縮率が小さくなる。そのため、成形物を焼成して得
られたセラミックスは、機械加工や放電加工の必要がな
いか、またはこれらの加工が少なくてすむ。そのため、
出来上がったセラミックスの特性変化が少ない。さらに
、機械加工や放電加工を省略することができるため、セ
ラミックスのコストダウンを図ることができる。(Effects of the Invention) According to the present invention, since the oxide powder contracts and the metal powder expands, the overall shrinkage rate due to firing of the molded product is reduced. Therefore, the ceramic obtained by firing the molded product does not require machining or electric discharge machining, or requires less of these machining processes. Therefore,
There is little change in the properties of the finished ceramics. Furthermore, since machining and electrical discharge machining can be omitted, the cost of ceramics can be reduced.
゛ この発明の上述の目的、その他の目的、特徴および
利点は、以下の実施例の詳細な説明から一層明らかとな
ろう。The above objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments.
（実施例）
まず、原料としてＡｔ粉末とＡｌｔｏｓ粉末とを表に示
す割合で調合し混合して混合物を得た。(Example) First, At powder and Altos powder as raw materials were prepared and mixed in the ratio shown in the table to obtain a mixture.
この混合物にバインダを加え、直径１０ｆｉ、厚さ３寵
に成形して成形物を得た。この成形物を１６００℃で２
時間焼成し、試料１〜８を得た。これらの試料について
、焼成後の収縮率を測定し表に示した。収縮率は、次式
によって算出した。A binder was added to this mixture, and the mixture was molded to a diameter of 10 fi and a thickness of three centimeters to obtain a molded product. This molded product was heated at 1600℃ for 2
Samples 1 to 8 were obtained by baking for a period of time. For these samples, the shrinkage rate after firing was measured and shown in the table. The shrinkage rate was calculated using the following formula.
表
表かられかるように、この実施例のセラミックスでは、
その収縮率が２．０％以下と小さい、 造。As can be seen from the table, in the ceramics of this example,
Its shrinkage rate is less than 2.0%.
なお、原料の割合の限定理由は次の通りである。１すな
わち、Ａｌｔｏ、が９５重量％を超えると、焼成薇の収
縮率が大きくなってし−まう。The reason for limiting the ratio of raw materials is as follows. 1, that is, if Alto exceeds 95% by weight, the shrinkage rate of the fired rose will increase.
また、Ａ１が８０重量％を超えると、原料が均一に分散
せず、そのため均質なセラ、ミックスを得ることができ
ない。Furthermore, if A1 exceeds 80% by weight, the raw materials will not be uniformly dispersed, making it impossible to obtain a homogeneous ceramic or mix.
上述の実施例では、原料としてＡｔ粉末およびＡＩ！ｔ
Ｏｓ粉末を用いたが、たとえばＴｉ０ｇ。In the above examples, At powder and AI! are used as raw materials. t
Although Os powder was used, for example, 0 g of Ti.
ＺｒＯ，、ＢａＴｉ０，１などの酸化物や複合酸化物を
用いても同様の結果を得ることができる。Similar results can be obtained by using oxides or composite oxides such as ZrO, BaTi0,1, etc.
このように、この発明によれば、成形物を焼成するとき
に、収縮率の小さい低収縮セラミックスを得ることがで
きる。そのため、複雑な形状のセラミックスを所望の寸
法に近い寸法で形成することができる。したがって、機
械加工や放電加工などをしなくてすむか、またはこれら
の加工が少なくてすむため、セラミックスの特性変化を
小さくすることができる。さらに、これらの加工を省略
することができるため、セラミックスを安価に製するこ
とができる。As described above, according to the present invention, it is possible to obtain a low-shrinkage ceramic having a small shrinkage rate when firing a molded product. Therefore, ceramics having a complicated shape can be formed with dimensions close to desired dimensions. Therefore, machining, electric discharge machining, etc., are not required or the number of these processes can be reduced, so that changes in the characteristics of the ceramic can be reduced. Furthermore, since these processes can be omitted, ceramics can be manufactured at low cost.
特許出願人 株式会社 村田製作所 代理人 弁理士 岡 １）・全 啓Patent applicant: Murata Manufacturing Co., Ltd. Agent: Patent Attorney Oka 1), Zenhiro
Claims (1)
ス。Claims: A low-shrinkage ceramic containing 5-80% by weight of metal powder and 20-95% by weight of oxide powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62290278A JPH01129948A (en) | 1987-11-16 | 1987-11-16 | Low-shrinkage ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62290278A JPH01129948A (en) | 1987-11-16 | 1987-11-16 | Low-shrinkage ceramics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01129948A true JPH01129948A (en) | 1989-05-23 |
Family
ID=17754072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62290278A Pending JPH01129948A (en) | 1987-11-16 | 1987-11-16 | Low-shrinkage ceramics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01129948A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04303601A (en) * | 1991-03-30 | 1992-10-27 | Ngk Insulators Ltd | Manufacture of precision hollow ceramic body |
| CN104308956A (en) * | 2014-09-29 | 2015-01-28 | 无锡康伟工程陶瓷有限公司 | Ceramic green body with low shrinking percentage and production method thereof |
-
1987
- 1987-11-16 JP JP62290278A patent/JPH01129948A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04303601A (en) * | 1991-03-30 | 1992-10-27 | Ngk Insulators Ltd | Manufacture of precision hollow ceramic body |
| CN104308956A (en) * | 2014-09-29 | 2015-01-28 | 无锡康伟工程陶瓷有限公司 | Ceramic green body with low shrinking percentage and production method thereof |
| CN104308956B (en) * | 2014-09-29 | 2016-05-18 | 无锡康伟工程陶瓷有限公司 | Ceramic idiosome and the production method thereof of low-shrinkage |
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