JPH0459123B2 - - Google Patents
Info
- Publication number
- JPH0459123B2 JPH0459123B2 JP58023727A JP2372783A JPH0459123B2 JP H0459123 B2 JPH0459123 B2 JP H0459123B2 JP 58023727 A JP58023727 A JP 58023727A JP 2372783 A JP2372783 A JP 2372783A JP H0459123 B2 JPH0459123 B2 JP H0459123B2
- Authority
- JP
- Japan
- Prior art keywords
- molded body
- sintered body
- ceramic
- ceramic sintered
- treatment
- 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 - Lifetime
Links
Landscapes
- Producing Shaped Articles From Materials (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は射出成形法により成形したセラミツク
成形体をセラミツク焼結体の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for producing a ceramic sintered body from a ceramic molded body formed by an injection molding method.
近時、射出成形法を利用したセラミツク焼結体
の製造が試みられている。この方法はAl2O3、
Si3N4、SiCなどのセラミツク粉末にバインダを
加えて造粒した混合物を射出成形装置により射出
成形し、得られた成形体を脱脂及び焼結してセラ
ミツク焼結体を製造するものであつた。しかし、
射出成形により成形したセラミツク成形体を焼結
した場合、内部にクラツクが生じてしまうことが
多かつた。特にセラミツク成形体がタービンエン
ジンのロータのように不均一な肉厚を有する複雑
な形状のものや、板状のものでも厚さが10mm以上
のものでは、クラツクが生じやすかつた。このク
ラツクの生じたセラミツク焼結体は、このクラツ
クが原因となつてセラミツク焼結体の曲げ強度、
圧縮強度、耐熱衝撃性などの強度特性が大幅に低
下してしまつていた。発明者は、セラミツク焼結
体に生じるクラツクの生成過程を研究した結果、
射出成形時にセラミツク成形体に生ずる歪の影響
が大きいことを見出した。この歪は、不均一な肉
厚部に生ずる熱分布の乱れおよびまたは射出圧力
の不均一等によるものと考えられる。この歪が焼
結過程にて顕在化してくるものと思われる。本発
明は、このような知見にもとづきなされたもので
ある。
Recently, attempts have been made to produce ceramic sintered bodies using injection molding. This method uses Al 2 O 3 ,
A ceramic sintered body is produced by injection molding a mixture of ceramic powder such as Si 3 N 4 and SiC with a binder and granulating it using an injection molding device, and degreasing and sintering the obtained molded body. Ta. but,
When a ceramic molded body formed by injection molding is sintered, cracks often occur inside the ceramic molded body. Cracks were particularly likely to occur when the ceramic molded body had a complex shape with uneven wall thickness, such as the rotor of a turbine engine, or when it was plate-shaped and had a thickness of 10 mm or more. The bending strength of the ceramic sintered body with this crack is due to this crack.
Strength properties such as compressive strength and thermal shock resistance were significantly reduced. As a result of research into the formation process of cracks that occur in ceramic sintered bodies, the inventor discovered that
It has been found that the strain that occurs in ceramic molded bodies during injection molding has a large effect. This distortion is thought to be due to disturbances in heat distribution occurring in the non-uniform wall thickness, or non-uniform injection pressure. It is thought that this strain becomes apparent during the sintering process. The present invention has been made based on such knowledge.
本発明は、射出成形により成形したセラミツク
成形体から、クラツクのない均質のセラミツク焼
結体を製造する方法を提供するものである。
The present invention provides a method for producing a crack-free homogeneous ceramic sintered body from a ceramic molded body formed by injection molding.
本発明は射出成形したセラミツク成形体に歪取
り処理を施した後、焼結するものである。歪取り
処理は、射出成形により得られるセラミツク成形
体の内部に蓄積された歪を緩和する処理である。
歪取り処理としては、加熱処理あるいは加圧処理
またはこれらの組合せ処理がある。本発明の典型
的な方法としては次のようなものが挙げられる。
In the present invention, an injection molded ceramic molded body is subjected to strain relief treatment and then sintered. The strain relief treatment is a treatment for relieving strain accumulated inside a ceramic molded body obtained by injection molding.
The strain relief treatment includes heat treatment, pressure treatment, or a combination thereof. Typical methods of the present invention include the following.
射出成形により成形したセラミツク成形体に、
このセラミツク成形体と反応しない圧力伝達媒体
を介して加圧すると同時に加熱する歪取り処理を
行ない、この処理の後にセラミツク成形体を脱
脂・焼結する。このようにして成形工程と脱脂・
焼結工程との間に圧力伝達媒体を用いて加圧と同
時に加熱する歪取り処理を行なうと、セラミツク
成形体中のすべての部分に均一な圧力と温度が加
えられ、セラミツク成形体中のクラツクが速やか
に解消される。また、この歪取り処理後に冷却し
てもクラツクは生じない。この理由は、歪取り処
理の加熱及び加圧によりセラミツク成形体内部は
均質化してこの状態での加圧によりクラツクが解
消するが、一定時間のこの加熱・加圧後もセラミ
ツク成形体の各部分が均一に温度と圧力が下げら
れることによつてセラミツク成形体のどの部分に
も新たな温度差、圧力差によるひずみが生じない
ためと考えられる。こうして、クラツクを解消さ
せたセラミツク成形体を脱脂・焼結すれば、例え
ばタービンエンジンのロータ等の回転翼車のよう
な複雑な形状のものでも、射出成形法により成形
して歪取り処理を加えて脱脂・焼結することによ
り、容易にクラツクのないセラミツク焼結体を製
造することができる。 A ceramic molded body formed by injection molding,
Strain relief treatment is performed by applying pressure and heating at the same time through a pressure transmission medium that does not react with the ceramic molded body, and after this treatment, the ceramic molded body is degreased and sintered. In this way, the molding process and degreasing/
During the sintering process, a pressure transmission medium is used to remove strain by applying pressure and heating at the same time. This applies uniform pressure and temperature to all parts of the ceramic molded body, and reduces cracks in the ceramic molded body. will be resolved promptly. Furthermore, no cracks occur even when the product is cooled after this strain relief treatment. The reason for this is that the inside of the ceramic molded body becomes homogenized by heating and pressurizing during the strain relief treatment, and cracks are eliminated by applying pressure in this state, but even after this heating and pressurization for a certain period of time, each part of the ceramic molded body This is thought to be because the temperature and pressure are lowered uniformly, so that no new strain due to temperature or pressure differences occurs in any part of the ceramic molded body. By degreasing and sintering a ceramic molded body that has been freed from cracks in this way, it can be molded using the injection molding method to remove distortion, even if it has a complex shape such as a rotary blade wheel such as the rotor of a turbine engine. By degreasing and sintering, a crack-free ceramic sintered body can be easily produced.
本発明の一実施例を図面を参照して説明する。
セラミツク成形体１はそれぞれ平均粒径0.5〜
2.0μのSi3N4粉末93％、Y2O3粉末５％、Al2O3粉
末２％、TiO2粉末２％、AlN粉末２％を配合し
た混合粉末にバインダとして融点が30〜40℃のパ
ラフインを上記混合粉末に対して10〜30％加えた
混合物を造粒して、射出成形装置でタービンエン
ジンのロータの形状に成形したものである。
An embodiment of the present invention will be described with reference to the drawings.
Each ceramic molded body 1 has an average particle size of 0.5~
A mixed powder containing 93% of 2.0μ Si 3 N 4 powder, 5% of Y 2 O 3 powder, 2% of Al 2 O 3 powder, 2% of TiO 2 powder, and 2% of AlN powder is used as a binder with a melting point of 30 to 40. A mixture in which 10 to 30% of the above mixed powder is added with paraffin at ℃ is granulated and molded into the shape of a turbine engine rotor using an injection molding machine.
第１図および第２図は本発明の実施例の歪取り
処理に用いた装置であり、この装置は上部に注入
口２を有し下部に流出口３を有して内側に圧力伝
達媒体４として液体例えば水およびセラミツク成
形体１を入れる断熱容器５と、のこの断熱容器５
の上部から圧力伝達媒体４を加圧するプランジヤ
ー６と断熱容器(5)内で圧力伝達媒体４を加熱する
ヒーター７から成り立つている。 1 and 2 show an apparatus used for strain relief processing according to an embodiment of the present invention. This apparatus has an inlet 2 at the top, an outlet 3 at the bottom, and a pressure transmission medium 4 inside. a heat insulating container 5 containing a liquid such as water and a ceramic molded body 1;
It consists of a plunger 6 that pressurizes the pressure transmission medium 4 from above and a heater 7 that heats the pressure transmission medium 4 within the heat insulating container (5).
射出成形により整形したセラミツク成形体１を
第１図の装置で処理工程を説明する。まず、流出
口３を開いた状態でプランジヤー６を上げて断熱
容器５からはなしてセラミツク成形体１を断熱容
器５中に入れた後にプランジヤー６を注入口２の
高さにまで下げる。次に、圧力伝達媒体４を注入
口２より断熱容器５内に注入して、流出口３から
少しあふれ出るほど十分満たす。この状態を第１
図に示した。 The process of processing a ceramic molded body 1 shaped by injection molding using the apparatus shown in FIG. 1 will be described. First, with the outlet 3 open, the plunger 6 is raised and removed from the heat insulating container 5, and after the ceramic molded body 1 is placed in the heat insulating container 5, the plunger 6 is lowered to the height of the injection port 2. Next, the pressure transmission medium 4 is injected into the heat insulating container 5 through the inlet 2 to fill it sufficiently so that it slightly overflows from the outlet 3. This state is the first
Shown in the figure.
次に、注入口２および流出口３を閉じて、プラ
ンジヤー６を下げることにより断熱容器５内の圧
力伝達媒体４を所望の圧力に加圧して、ヒーター
７により所望の温度に加熱する。この状態を第２
図に示した。本実施例の製造方法においては、圧
力伝達媒体５として水を用いて250Kg／cm2の圧力、
50℃の温度で５分間の処理を行なつた。 Next, the inlet 2 and the outlet 3 are closed, the plunger 6 is lowered to pressurize the pressure transmission medium 4 in the heat insulating container 5 to a desired pressure, and the heater 7 heats it to a desired temperature. This state is the second
Shown in the figure. In the manufacturing method of this example, water is used as the pressure transmission medium 5 and a pressure of 250 kg/cm 2 is applied.
Treatment was carried out at a temperature of 50°C for 5 minutes.
その後、徐々に圧力と温度を下げてセラミツク
成形体１を取り出してセラミツク成形体を得る。
このセラミツク成形体１を脱脂・焼結してセラミ
ツク焼結体を製造する。得られたセラミツク成形
体を切断して内部検査した結果、いずれのものに
もクラツクが生じていないことが確認された。こ
の実施例の場合、成形体が加熱され軟化した状態
で圧力が加わるため成形体内部の歪が除去された
均質なものとなる。この実施例の場合、加熱温度
は成形体が軟化する温度20〜50℃程度が好まし
く、圧力としては50〜1000Kg／cm2程度がよい。な
お、圧力伝達媒体としては、成形体への浸透がな
い水、油類等の液体が好ましい。この実施例の場
合は、成形体に用いたバインダーが撥水性を有し
ており水で充分であつた。 Thereafter, the pressure and temperature are gradually lowered and the ceramic molded body 1 is taken out to obtain a ceramic molded body.
This ceramic molded body 1 is degreased and sintered to produce a ceramic sintered body. As a result of cutting the obtained ceramic molded bodies and internally inspecting them, it was confirmed that no cracks had occurred in any of them. In the case of this embodiment, since pressure is applied to the molded body in a heated and softened state, the strain inside the molded body is removed and the molded body becomes homogeneous. In the case of this example, the heating temperature is preferably about 20 to 50°C, the temperature at which the molded body softens, and the pressure is preferably about 50 to 1000 kg/cm 2 . The pressure transmission medium is preferably a liquid such as water or oil that does not penetrate into the molded body. In the case of this example, the binder used in the molded article had water repellency, so water was sufficient.
本発明の製造方法によれば射出成形により成形
したクラツクを有するセラミツク成形体を歪取り
処理を加えることによりクラツクのないセラミツ
ク焼結体を容易に製造することができる。
According to the manufacturing method of the present invention, a crack-free ceramic sintered body can be easily manufactured by applying strain relief treatment to a ceramic molded body having cracks formed by injection molding.
図面は本実施例の製造方法に用いた歪取り処理
装置を示すもので、第１図は歪取り処理装置の断
熱容器にセラミツク成形体を入れ、圧力伝達媒体
を満たした状態の断面図、第２図は歪取り処理装
置でセラミツク成形体を加圧および加熱している
状態の断面図である。
１：セラミツク成形体、４：圧力伝達媒体、
６：プランジヤー、７：ヒーター。
The drawings show the strain relief processing device used in the manufacturing method of this example. Fig. 1 is a cross-sectional view of the strain relief processing device in which a ceramic molded body is placed in a heat insulating container and filled with a pressure transmission medium. FIG. 2 is a sectional view of a ceramic molded body being pressurized and heated by a strain relief processing device. 1: Ceramic molded body, 4: Pressure transmission medium,
6: plunger, 7: heater.
Claims (1)
と、セラミツク成形体の歪取り処理を施す工程
と、セラミツク成形体を焼結する工程とを具備す
るセラミツク焼結体の製造方法。 ２ 歪取り処理は、加熱処理である特許請求の範
囲第１項に記載のセラミツク焼結体の製造方法。 ３ 歪取り処理は、加圧処理である特許請求の範
囲第１項に記載のセラミツク焼結体の製造方法。 ４ 歪取り処理は、加熱と同時に加圧を施す処理
である特許請求の範囲第１項に記載のセラミツク
焼結体の製造方法。 ５ 加圧は、等方加圧である特許請求の範囲第３
項または第４項に記載のセラミツク焼結体の製造
方法。 ６ 加圧は、圧力伝達媒体を介して行なう特許請
求の範囲第５項に記載のセラミツク焼結体の製造
方法。 ７ セラミツク焼結体は不均一な肉厚を有するも
のである特許請求の範囲第１項に記載のセラミツ
ク焼結体の製造方法。 ８ セラミツク焼結体は翼部を備えた回転体であ
る特許請求の範囲第７項に記載のセラミツク焼結
体の製造方法。[Scope of Claims] 1. A method for producing a ceramic sintered body, comprising the steps of obtaining a ceramic molded body by injection molding, subjecting the ceramic molded body to a strain relief treatment, and sintering the ceramic molded body. 2. The method for manufacturing a ceramic sintered body according to claim 1, wherein the strain relief treatment is a heat treatment. 3. The method for manufacturing a ceramic sintered body according to claim 1, wherein the strain relief treatment is a pressure treatment. 4. The method of manufacturing a ceramic sintered body according to claim 1, wherein the strain relief treatment is a treatment of applying pressure at the same time as heating. 5 The pressurization is isostatic pressurization in Claim 3
A method for producing a ceramic sintered body according to item 1 or 4. 6. The method for manufacturing a ceramic sintered body according to claim 5, wherein the pressurization is performed via a pressure transmission medium. 7. The method of manufacturing a ceramic sintered body according to claim 1, wherein the ceramic sintered body has a non-uniform wall thickness. 8. The method for manufacturing a ceramic sintered body according to claim 7, wherein the ceramic sintered body is a rotating body having wing portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58023727A JPS59150707A (en) | 1983-02-17 | 1983-02-17 | Manufacture of ceramic sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58023727A JPS59150707A (en) | 1983-02-17 | 1983-02-17 | Manufacture of ceramic sintered body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59150707A JPS59150707A (en) | 1984-08-29 |
| JPH0459123B2 true JPH0459123B2 (en) | 1992-09-21 |
Family
ID=12118343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58023727A Granted JPS59150707A (en) | 1983-02-17 | 1983-02-17 | Manufacture of ceramic sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59150707A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63107686U (en) * | 1986-12-27 | 1988-07-11 |
-
1983
- 1983-02-17 JP JP58023727A patent/JPS59150707A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59150707A (en) | 1984-08-29 |
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