JPS6377704A - Manufacture of ceramic sintered body - Google Patents
Manufacture of ceramic sintered bodyInfo
- Publication number
- JPS6377704A JPS6377704A JP22267286A JP22267286A JPS6377704A JP S6377704 A JPS6377704 A JP S6377704A JP 22267286 A JP22267286 A JP 22267286A JP 22267286 A JP22267286 A JP 22267286A JP S6377704 A JPS6377704 A JP S6377704A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic sintered
- sintered body
- casting
- slip
- mold
- 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 31
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 238000007569 slipcasting Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 8
- 239000004925 Acrylic resin Substances 0.000 claims description 5
- 230000002706 hydrostatic effect Effects 0.000 claims description 5
- 238000005304 joining Methods 0.000 claims description 3
- 239000002612 dispersion medium Substances 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 238000000462 isostatic pressing Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000011505 plaster Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- WHOPEPSOPUIRQQ-UHFFFAOYSA-N oxoaluminum Chemical compound O1[Al]O[Al]1 WHOPEPSOPUIRQQ-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- -1 sodium alkyl phosphate salt Chemical class 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (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) [Abstract] 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] 本発明はセラミック焼結体の!Flj造方法に関する。[Detailed description of the invention] [Industrial application field] The present invention is a ceramic sintered body! Regarding the Flj manufacturing method.
本発明の方法は、セラミックタービンホイール等の製造
方法に使用できる。The method of the present invention can be used in a method of manufacturing ceramic turbine wheels and the like.
[従来技術]
従来、例えばセラミックタービンホイールの製造方法の
1つとして射出成形法が採用されている。[Prior Art] Conventionally, for example, an injection molding method has been adopted as one of the methods for manufacturing ceramic turbine wheels.
この場合翼車のハブ部と羽根部は〜体物として成形する
ため金型の羽根部を形成するスライドコアの構造が複雑
であり、複雑な形状や肉厚差のため金型製作に多くのコ
ストと時間を要する。又形状や肉厚差によって脱脂時に
内部亀裂や表面亀裂が発生ずるといった問題がある。In this case, the hub part and blade part of the impeller are molded as a body object, so the structure of the slide core that forms the blade part of the mold is complicated, and due to the complicated shape and difference in wall thickness, there are many problems in mold production. It is costly and time consuming. There is also the problem that internal cracks and surface cracks occur during degreasing due to differences in shape and wall thickness.
又、従来の他のセラミックタービンホイールの製造方法
としては、特開昭56−46709号明細書に記載され
ているようにセラミックタービンホイールの厚肉部分で
あるディスク又(、(シャフト部をあらかじめプレス成
形した後、この成形体を剣出成彫金型内の定位置に設置
し、しかるのち、タービンホイールの薄肉部分であるブ
レードリンし、脱脂焼結する方法が知られている。この
場合においても射出成形により成形された成形体の脱脂
に多くの時間(通常1週間桿度)を要したり、脱脂を略
400〜500℃の高温で行わなければならないという
問題がある。In addition, as another conventional method for manufacturing ceramic turbine wheels, as described in Japanese Patent Application Laid-Open No. 56-46709, the thick portions of the ceramic turbine wheel, such as the disk or (shaft portion), are pressed in advance. After molding, a method is known in which the molded body is placed in a fixed position in a mold for molding, and then the thin-walled part of the turbine wheel is cleaned, degreased, and sintered. There are problems in that it takes a long time (usually one week) to degrease molded bodies molded by injection molding, and that degreasing must be carried out at a high temperature of about 400 to 500°C.
[発明が解決しようとする問題点]
本発明は、上記した欠点を克服するものであり、脱型時
の亀裂の発生が抑制され、脱脂を比較的低温下で行うこ
とが出来、かつ着肉所要時間を大巾に短縮できるセラミ
ックタービンホイール等のセラミック焼結体の製造方法
を提供することを目的とする。[Problems to be Solved by the Invention] The present invention overcomes the above-mentioned drawbacks, and is capable of suppressing the occurrence of cracks during demolding, allowing degreasing to be carried out at a relatively low temperature, and improving the bonding process. It is an object of the present invention to provide a method for manufacturing a ceramic sintered body such as a ceramic turbine wheel, which can greatly shorten the required time.
[問題点を解決するための手段]
本発明のセラミック焼結体の製造方法は、ヒラミックス
粉末をW膠剤とともに分散媒液中に懸濁させたスリップ
を用いて成形後焼結してなるセラミック焼結体の製造方
法において、
該セラミック焼結体の厚肉部分を構成する部分をあらか
じめ成形し成形体を形成する成形工程と、該成形体をス
リップキャスティング成形型内の所定位置に設置する配
置工程と、
該成形体とスリップキャスティング成形型内壁間のキャ
ビティに前記スリップを鋳込むと同時に該成形体との接
合一体化を行い鋳込み成形体を1qる鋳込み成形工程と
、
該鋳込み成形体を該スリップキャスティング成形型から
離型させる脱型工程と、
脱型後、該鋳込み成形体を乾燥させる乾燥工程と、
乾燥後、該持込み成形体を焼結し緻密化する焼結工程と
、
からなることを特徴と覆るものである。[Means for Solving the Problems] The method for producing a ceramic sintered body of the present invention involves molding and sintering Hiramix powder using a slip in which it is suspended in a dispersion medium together with a W glue. A method for producing a ceramic sintered body includes a molding step in which a thick portion of the ceramic sintered body is pre-molded to form a molded body, and a molded body is placed at a predetermined position in a slip casting mold. a placing step; a casting step of casting the slip into a cavity between the molded body and the inner wall of the slip casting mold, and simultaneously joining and integrating the slip with the molded body to form a cast molded body; It consists of a demolding process of releasing the mold from the slip casting mold, a drying process of drying the cast molded body after demolding, and a sintering process of sintering and densifying the brought-in molded body after drying. This is a feature that covers this.
本発明の製造方法は窒化珪素(S+3N4)、炭化珪素
(S i C) 、アルミプ(Al2O2>等のセラミ
ック材料を用いて予め成形しておいたハブ又はシャフト
部の厚肉成形体を、スリップキャスティング成形型内に
配置し、厚肉成形体とスリップキャスティング型内壁間
のキャビティにスリップを鋳込み一体化することを特色
とするものである。The manufacturing method of the present invention involves slip casting a thick-walled hub or shaft part that has been pre-formed using a ceramic material such as silicon nitride (S+3N4), silicon carbide (S i C), or aluminum (Al2O2). The feature is that the slip is placed in a mold and integrated by casting into a cavity between the thick-walled molded body and the inner wall of the slip casting mold.
すなわち本発明のセラミック焼結体の製造方法は、事前
に行われる厚内部分の成形工程と、成形品をスリップキ
ャスティング成形型内に配wiする配置工程と、接合一
体化を行う鋳込み成形工程、その後の脱型工程、乾燥工
程及び焼成1稈とからなる。That is, the method for manufacturing a ceramic sintered body of the present invention includes a step of forming a thick inner part performed in advance, a placement step of disposing the molded product in a slip casting mold, a casting step of joining and integrating, It consists of a subsequent demolding process, a drying process, and firing one culm.
予め行う厚肉部分の成形は、石こう型による通常行われ
るスリップキャスティング、静水圧成形金型によるプレ
ス成形から選んで行うことが出来る。この場合石こう型
によるスリップキャスティングが好適と考えられる。ゴ
ム型を用いた静水圧成形も適しているが、形状によって
後加工として機械加工を要する場合がある。プレス成形
は充填密度の不均一を生じる場合があるので厚肉の程度
が増すとガかしくなる。The thick portion can be formed in advance by selecting from the usual slip casting using a plaster mold or press forming using an isostatic mold. In this case, slip casting using a plaster mold is considered suitable. Isostatic pressing using a rubber mold is also suitable, but depending on the shape, machining may be required as post-processing. Press molding may result in non-uniform filling density, and as the thickness increases, it becomes bulkier.
上記予め成形しておいた厚肉部分の成形体をスリップキ
ャスiイング型内のキVビテC内に配置するのが次−F
稈としての配置1稈である。The next step is to place the pre-formed thick-walled part into the groove C in the slip casting mold.
Arrangement as a culm It is one culm.
次いで、後述の組成からなるスリップをスリップキ1F
スディング型の鋳込み[1から流し込みE訴4成形体と
の接合一体化を図るのが鋳込み成形II稈ぐある。Next, a slip consisting of the composition described below was placed in the slip key 1F.
Casting mold casting [1 to pouring E case 4 Casting molding II culm is used to connect and integrate the molded body.
所定時間(約20分間)谷肉後脱型]−程により型を取
り除く。脱型後、乾燥■稈を経て、焼結T稈を実施する
。焼結は、例えば、窒県加几下で1760℃4時間、又
はヘリウム1気FF雰囲気下で2080℃1時間行うこ
とがC′きる。Demoulding after valley fill for a predetermined period of time (approximately 20 minutes) - Remove the mold. After demolding, the culm is dried and then sintered into a T-culm. The sintering can be performed, for example, at 1760° C. for 4 hours under nitrogen sintering, or at 2080° C. for 1 hour under a helium FF atmosphere.
L実施例1
以−ト、実施例により本発明を説明覆る。1(第1実施
例)
本実施例は一例としてセラミックタービンホイールを製
造する場合につい−(説明リ−る。Example 1 The present invention will now be explained with reference to examples. 1 (First Embodiment) This embodiment will be explained as an example of the case where a ceramic turbine wheel is manufactured.
セラミックタービンホイールの厚肉部分であるハブ部又
はシャ71〜部をにう41JにJ、リスリップ1ヤステ
イング、或いはゴム型を用いた静水几成形、或いは金型
によるプレス成形のいずれかにより予め成形する成形口
[稈をまず行う1、セラミック材料 として(ま窒化珪
素(Si3N4)で代表させるJミ炭化珪素(SiC)
やアルミナ(△1703)などを用いることもできるが
高温椛造用月利ぐあることが好ましい。The hub part or the shaft 71 to 71 parts, which are the thick parts of the ceramic turbine wheel, are preformed by either Rislip 1 casting, hydrostatic molding using a rubber mold, or press molding using a mold. The molding mouth [firstly, the culm is formed 1. As a ceramic material (silicon carbide (SiC) represented by silicon nitride (Si3N4))
Although it is also possible to use alumina (Δ1703) or the like, it is preferable to use a material suitable for high-temperature production.
スリップの組成としては、
〈1)β−8iC平均粒径0.25μm、98゜02
wt%、
J]晶質ホウ素平均粒径0.15μm、0.28wt%
、
カーボンブラック平均粒径0.02μm11.70wt
%、」メ十の混合物69.0wt%に リン酸アルキル
ナトリウム塩系解膠剤1.6W4[%、ポリカルボン酸
素解膠剤i、Qwt%及びベンゼン28.4wt%から
なるものを用いるか、或いは、
(2)α−8i3N4平均粒径0.9μm、97゜Qw
t%、
Y2O3平均粒径0.8um、1.swt%、MaO平
均粒径0.01μm、0.4wt%、△1203平均粒
径0.02μm1
1.1wt%、以上の混合物75.0wt%と、解膠剤
として水ガラス0.4wt%及び純水(蒸溜後イオン交
換>24.6wt%からなるもの、
以−ト(1)又は(2)の組成のスリップを用いた。The composition of the slip is as follows: (1) β-8iC average particle size 0.25 μm, 98°02
wt%, J] Crystalline boron average particle size 0.15 μm, 0.28 wt%
, Carbon black average particle size 0.02μm 11.70wt
%, 69.0 wt % of the mixture of Meju, a sodium alkyl phosphate salt peptizer consisting of 1.6 W4 [%, polycarbonate oxygen peptizer i, Q wt % and benzene 28.4 wt %, Or (2) α-8i3N4 average particle size 0.9 μm, 97°Qw
t%, Y2O3 average particle size 0.8 um, 1. swt%, MaO average particle size 0.01 μm, 0.4 wt%, Δ1203 average particle size 0.02 μm1 1.1 wt%, 75.0 wt% of the above mixture, 0.4 wt% of water glass as a deflocculant, and pure Water (consisting of ion exchange after distillation >24.6 wt%) A slip having the composition shown in (1) or (2) below was used.
上記予め成形したハブ又はシトフト部の成形体Aを第2
図のスリップキャスディング成形型のキャビティ5内に
第1図に斜線で示すように配置した。第1図において、
7はターボホイール、8はハブ部、9は翼部、10は回
転軸部である。第2図はターボホイールのスリップキャ
スティング成形型構成を示し、1は吸水性のないプラス
チック型、2〜4は石こう型、5はキャビティ、6はス
リップの鋳込み[1である。なお上記2は!XJ f’
Js 9形成のための可動型(脱型時に前進後退可)C
ある。The above pre-formed hub or shaft part molded body A is
It was placed in the cavity 5 of the slip casting mold shown in the figure as shown by diagonal lines in FIG. In Figure 1,
7 is a turbo wheel, 8 is a hub portion, 9 is a wing portion, and 10 is a rotating shaft portion. Figure 2 shows the configuration of a slip casting mold for a turbo wheel, where 1 is a non-water-absorbing plastic mold, 2 to 4 are plaster molds, 5 is a cavity, and 6 is a slip casting mold [1]. In addition, the above 2! XJ f'
Movable mold for forming Js 9 (can move forward and backward during demolding) C
be.
このように配置した成形体のキャビグイ5に露出した表
面を上記(2)の組成比をもつスリップの純水と水ガラ
ス2成分からなる液体で濡らした後、(2)の組成のス
リップを第2図の鋳込み口6から流しこみ、20分間着
肉させた。着肉後、プラスブック型1(第2図)を除き
、翼部形状を形成させる可動型2を後退させて脱型し1
通常通り、乾燥さゼた。乾燥後一体化した成形体(最外
仔φ102)を9.5kQ/cm20)窒素加圧下で1
760℃で4時間焼結し製品とした。外観及び内部検査
(超音波探傷、透過X線)で亀裂くクラック)は認めら
れなかった。After wetting the surface exposed to the cavity 5 of the molded body arranged in this manner with a liquid consisting of two components, pure water and water glass, the slip having the composition ratio of (2) above is wetted, and then the slip having the composition of (2) is It was poured through the casting port 6 shown in Figure 2 and allowed to ink for 20 minutes. After inking, remove the plus book mold 1 (Fig. 2), move the movable mold 2 that forms the wing shape backwards, and remove the mold 1.
Dry as usual. After drying, the integrated molded body (outermost diameter 102 mm) was heated at 9.5 kQ/cm20) under nitrogen pressure.
The product was sintered at 760°C for 4 hours. No cracks were found during external and internal inspection (ultrasonic flaw detection, transmitted X-ray).
(第2実施例)
予め成形したハブ部又はシャ71〜部の成形体8を第3
図に斜線で示すように第2図のスリップキレスティング
成形型のキャビティ5内へ配置した。(Second Example) The pre-formed hub portion or the molded body 8 of the shaft 71 to the third
As shown by diagonal lines in the figure, it was placed in the cavity 5 of the slip quellesting mold shown in FIG.
−上記(1)の組成をもったスリップのうち、重量比で
ポリカルボン酸系解膠剤1.5、ポリアクリル系結合剤
1,0、ベンゼン21.5を、キャビ−jイ5内に配置
された成形体の表面に噴霧して濡らし、〈1)の組成の
スリップを第1実施例とIbノ様に第2図の持込み06
からスリップキャスティングy!内へ流し込み、着肉(
35分)後、脱型し、乾燥させた。- Among the slips having the composition (1) above, a weight ratio of 1.5 polycarboxylic acid deflocculant, 1.0 polyacrylic binder, and 21.5 benzene was placed in the cavity 5. The surface of the arranged molded body was sprayed and wetted, and the slip having the composition of <1) was brought in as shown in Figure 2 in Example 1 and Ib.
From slip casting y! Pour it inside and apply it (
After 35 minutes), the mold was removed and dried.
乾燥後一体化した成形体全体をポリアクリル樹脂のトル
エン溶液(a度23%)へ浸漬し、余分の液を流し落し
て乾燥きゼ、成形体表面に厚さ0゜2nun程度の柔軟
なポリアクリル樹脂膜を形成密封状態とした。次いで、
水中にて3ton/cm2の静水圧加圧を施し、高密痩
成形体とした。この成形体を1400℃まで10 t
orr以下の真空度で排気し、以後寺ヘリウム1気圧雰
囲気下で2080℃1時間焼結し、製品とした。外観及
び内部検査でクラックは認められなかった。After drying, the entire integrated molded body is immersed in a toluene solution of polyacrylic resin (A degree 23%), the excess liquid is poured off, and after drying, a flexible polyester with a thickness of about 0°2 nm is coated on the surface of the molded body. An acrylic resin film was formed and sealed. Then,
Hydrostatic pressurization of 3 ton/cm 2 was applied in water to obtain a high-density and thin molded body. This molded body was heated to 1400℃ for 10 tons.
The product was evacuated to a vacuum level of orr or less, and then sintered at 2080° C. for 1 hour in an atmosphere of 1 atm of helium to obtain a product. No cracks were observed during external and internal inspection.
(第3実施例)
予め成形したハブ部又はシャ71〜部の成形体A又は8
を第2図のキャビティ5内へ配置した。第1及び第2実
施例と巽なり、成形体のキャビティ側表面を液体で濡ら
す工程を不要化した。(Third Example) Pre-formed hub part or molded body A or 8 of the shaft part 71 to 8
was placed in the cavity 5 shown in FIG. Similar to the first and second embodiments, the step of wetting the cavity side surface of the molded body with liquid is no longer necessary.
本実施例では、翼の変形が生じない稈疫に短時間の着肉
(5〜10分間位)ですませることが肝要で、さもない
と、配置した成形体に対して着肉体の乾燥収縮により着
肉体がひび割れし易いn着肉体の乾燥が不十分(収縮が
十分に生じない)の状態で、ポリアクリル樹脂のトルエ
ン溶液にスリップキャス1−された成形体を浸漬し、第
1実施例及び第2実施例と同様に乾燥させて表面を水の
不透過性膜で覆った後、静水圧加圧(1,5〜3ton
/cm2)を行った。In this example, it is important to attach the culm for a short time (about 5 to 10 minutes) so that the wing does not deform. In a state in which the attached body is prone to cracking, and the attached body is insufficiently dried (sufficient shrinkage does not occur), the slip-cast molded body is immersed in a toluene solution of polyacrylic resin, and After drying and covering the surface with a water-impermeable membrane in the same manner as in the second example, hydrostatic pressure (1,5 to 3 tons) was applied.
/cm2).
なおスリップキャスティング用の石こう型は固化させる
に際し、翼形状第1直線部禍成させる可動型は元型の表
面を鏡面仕上げしておいた方がよいし、更に100kg
/cm2程度の加圧を行った方がよい。こうすることに
よっで着肉体の離型性も大IJに改善され、脱型時(可
動型の後退時)着肉体の翼間りにひび割れの発生するの
を防止できる。更に好ましいのは、可動型の表面へポリ
テトラフルオロ1チレンのような離栴型剤を塗布してお
くことである。In addition, when solidifying the plaster mold for slip casting, it is better to have a mirror finish on the surface of the movable mold for forming the first straight part of the airfoil shape, and it is also 100 kg.
It is better to apply a pressure of about /cm2. By doing this, the mold releasability of the attached body is improved to a large IJ, and it is possible to prevent the occurrence of cracks between the wings of the attached body during demolding (when the movable mold is retreated). More preferably, the surface of the movable mold is coated with a soap release agent such as polytetrafluoro-1-ethylene.
静水圧加圧後、第1又は第2の実施例のいずれかの方法
で焼成を行い製品とした。After the hydrostatic pressurization, the product was baked by the method of either the first or second embodiment.
[発明の効果]
本発明のセラミック焼結体の製造方法によれば、厚内部
分と薄肉部分を有し一体射出成形が固結な例えばセラミ
ックタービンホイールの製品をスリップキャスティング
法を利用することにより従来法に比べはるかに短時間で
製造でき、又、製品における亀裂の発生を確実に抑制で
きる。[Effects of the Invention] According to the method for manufacturing a ceramic sintered body of the present invention, a product, such as a ceramic turbine wheel, which has a thick inner part and a thin part and is solidified by integral injection molding, can be produced by using a slip casting method. It can be manufactured in a much shorter time than conventional methods, and the occurrence of cracks in the product can be reliably suppressed.
第1図は本発明の方法により成形された成形体のスリッ
プキャスティング法、キャビティ内の配置状態を示す説
明図である。
第2図はヒラミックタービンホイールのスリップキャス
ティング成形型構成を示す断面図である。
第3図は第1図と同様本発明の方法により成形された成
形体のスリップキャスティング、キャビティ内での配置
状態を示す説明図である。
1・・・プラスチック型
2.3.4・・・石こう型
5・・・型内キャビティ
6・・・スリップの鋳込み口
A、B・・・成形体
7・・・セラミックタービンホイール
= 13 −
8・・・セラミックタービンホイールのハブ部9・・・
セラミックタービンホイールの翼部10・・・セラミッ
クタービンホイールの回転軸部特許出願人 トヨタ
自動車株式会社代理人 弁理士 大川 宏
同 弁理士 丸山明夫
−14=FIG. 1 is an explanatory diagram showing the slip casting method of a molded body molded by the method of the present invention and the arrangement state in a cavity. FIG. 2 is a sectional view showing the configuration of a slip casting mold for a Hiramic turbine wheel. FIG. 3, like FIG. 1, is an explanatory view showing slip casting of a molded body molded by the method of the present invention and its arrangement in a cavity. 1...Plastic mold 2.3.4...Gypsum mold 5...Mold cavity 6...Slip casting ports A, B...Molded body 7...Ceramic turbine wheel = 13-8 ...Ceramic turbine wheel hub part 9...
Blade portion 10 of ceramic turbine wheel...Rotating shaft portion of ceramic turbine wheel Patent applicant Toyota Motor Corporation agent Patent attorney Hirodo Okawa Patent attorney Akio Maruyama-14=
Claims (5)
懸濁させたスリップを用いて成形後焼結してなるセラミ
ック焼結体の製造方法において、該セラミック焼結体の
厚肉部分を構成する部分をあらかじめ成形し成形体を形
成する成形工程と、該成形体をスリップキャスティング
成形型内の所定位置に設置する配置工程と、 該成形体とスリップキャスティング成形型内壁間のキャ
ビティに前記スリップを鋳込むと同時に該成形体との接
合一体化を行い鋳込み成形体を得る鋳込み成形工程と、 該鋳込み成形体を該スリップキャスティング成形型から
離型させる脱型工程と、 脱型後、該鋳込み成形体を乾燥させる乾燥工程と、 乾燥後、該鋳込み成形体を焼結し緻密化する焼結工程と
、 からなることを特徴とするセラミック焼結体の製造方法
。(1) In a method for producing a ceramic sintered body formed by molding and sintering using a slip in which ceramic powder is suspended in a dispersion medium together with a deflocculant, the thick portion of the ceramic sintered body is formed. a molding step of pre-molding a portion to be molded to form a molded body; a placement step of installing the molded body at a predetermined position in a slip casting mold; and a step of placing the slip in a cavity between the molded body and the inner wall of the slip casting mold. A casting process for obtaining a casting body by joining and integrating the casting body at the same time as casting, a demolding process for releasing the casting body from the slip casting mold, and after demolding, the casting process. A method for manufacturing a ceramic sintered body, comprising: a drying step of drying the body; and a sintering step of sintering and densifying the cast body after drying.
らかじめ成形する成形工程はスリップキャスティング法
による特許請求の範囲第1項記載のセラミック焼結体の
製造方法。(2) The method for producing a ceramic sintered body according to claim 1, wherein the forming step of preforming the thick portion of the ceramic sintered body is performed by a slip casting method.
らかじめ成形する成形工程は静水圧成形による特許請求
の範囲第1項記載のセラミック焼結体の製造方法。(3) The method for manufacturing a ceramic sintered body according to claim 1, wherein the forming step of preforming the thick portion of the ceramic sintered body is performed by isostatic pressing.
らかじめ成形する成形工程はプレス成形による特許請求
の範囲1項記載のセラミック焼結体の製造方法。(4) The method for manufacturing a ceramic sintered body according to claim 1, wherein the forming step of preforming the thick portion of the ceramic sintered body is press molding.
ル樹脂のトルエン溶液(濃度23%)へ浸漬し、次いで
乾燥させて該成形体表面にポリアクリル樹脂膜を形成さ
せさらに静水圧加圧を施したのち焼成工程を行う特許請
求の範囲第1項記載のセラミック焼結体の製造方法。(5) After the drying process, the integrated molded body is immersed in a toluene solution of polyacrylic resin (concentration 23%), and then dried to form a polyacrylic resin film on the surface of the molded body, and further subjected to hydrostatic pressure. The method for manufacturing a ceramic sintered body according to claim 1, wherein a firing step is performed after the above-mentioned steps are performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22267286A JPS6377704A (en) | 1986-09-19 | 1986-09-19 | Manufacture of ceramic sintered body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22267286A JPS6377704A (en) | 1986-09-19 | 1986-09-19 | Manufacture of ceramic sintered body |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6377704A true JPS6377704A (en) | 1988-04-07 |
Family
ID=16786119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22267286A Pending JPS6377704A (en) | 1986-09-19 | 1986-09-19 | Manufacture of ceramic sintered body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6377704A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63224903A (en) * | 1987-03-13 | 1988-09-20 | 日本碍子株式会社 | Manufacture of ceramics structure |
JP2010241128A (en) * | 2009-03-19 | 2010-10-28 | Ngk Insulators Ltd | Method of producing powder compact |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60141504A (en) * | 1983-12-28 | 1985-07-26 | トヨタ自動車株式会社 | Manufacture of ceramic part |
JPS61163810A (en) * | 1985-01-14 | 1986-07-24 | トヨタ自動車株式会社 | Method of molding powder |
-
1986
- 1986-09-19 JP JP22267286A patent/JPS6377704A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60141504A (en) * | 1983-12-28 | 1985-07-26 | トヨタ自動車株式会社 | Manufacture of ceramic part |
JPS61163810A (en) * | 1985-01-14 | 1986-07-24 | トヨタ自動車株式会社 | Method of molding powder |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63224903A (en) * | 1987-03-13 | 1988-09-20 | 日本碍子株式会社 | Manufacture of ceramics structure |
JP2010241128A (en) * | 2009-03-19 | 2010-10-28 | Ngk Insulators Ltd | Method of producing powder compact |
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