JPS60168606A - Manufacture of ceramic part - Google Patents
Manufacture of ceramic partInfo
- Publication number
- JPS60168606A JPS60168606A JP59025741A JP2574184A JPS60168606A JP S60168606 A JPS60168606 A JP S60168606A JP 59025741 A JP59025741 A JP 59025741A JP 2574184 A JP2574184 A JP 2574184A JP S60168606 A JPS60168606 A JP S60168606A
- Authority
- JP
- Japan
- Prior art keywords
- degreasing
- ceramic
- molded
- sintering
- coated
- 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.)
- Granted
Links
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】
〔技術分野〕
本発明はクラ７りや充填不良などの内部欠陥を含まない
セラミック部品の製造法に関するものである。ここにい
うセラミック部品は種々のものを含むが、代表例として
ターボチャージャー用タービンホイールのセラミック化
について以下に述べる。しかし、本発明は上記部品のみ
限定されるものでなく、セラミック部品一般を広く意味
する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing ceramic parts free of internal defects such as cracks and filling defects. The ceramic parts referred to herein include various types, but as a representative example, a ceramic turbine wheel for a turbocharger will be described below. However, the present invention is not limited to the above components, but broadly refers to ceramic components in general.
従来、セラミックタービンホイールは、セラミック粉末
と樹脂との混線、混線物の射出成形、成形物の脱脂、脱
脂物の焼結という工程を経て製造されていた。この製造
法によると以下に述べる種々の問題があることが指゛摘
され、その解消が望まれていた。Conventionally, ceramic turbine wheels have been manufactured through the steps of mixing ceramic powder and resin, injection molding the mixed material, degreasing the molded product, and sintering the degreased material. It has been pointed out that this manufacturing method has various problems as described below, and it has been desired to eliminate these problems.
（１）射出成形時の全型キャビティ内の流動状態に依存
した粗密が成形体内に残留する。(1) Differences in density depending on the flow state within the mold cavity during injection molding remain in the molded product.
（２）脱脂に長時間（通常２０日間）を要する。(2) Degreasing takes a long time (usually 20 days).
（３）さらに焼結段階で粗密に起因してクラ７りが入り
易い。(3) Further, cracks are likely to occur during the sintering stage due to the density.
（発明の目的）
本発明は上記従来技術の問題を解消するためになされた
もので、セラミック射出成形体内に粗密部が残留せず、
脱脂に要する時間を短縮し、かつ焼結時に粗密部に起因
するクラックが入らないようにすることができるセラミ
ック部品の製造法を提供することを目的とする。(Objective of the Invention) The present invention has been made to solve the problems of the prior art described above, and has the purpose of eliminating dense and dense portions from remaining in the ceramic injection molded body.
It is an object of the present invention to provide a method for manufacturing ceramic parts that can shorten the time required for degreasing and prevent cracks caused by dense and dense parts during sintering.
かかる目的は１本発明によれば、セラミック粉末と熱可
塑性樹脂との混線工程、混線物の射出成形工程、成形体
の脱脂工程および焼結工程を経てセラミック部品を製造
するに際し、前記脱脂工程と前記焼結工程との間１こ静
水圧加圧工程を挿入し、前記静水圧加圧工程において、
ｎ：ｉ記成形工程および脱脂工程を経て得られた成形脱
脂体に被覆を施し、この被覆脱脂体を加圧媒体中で加圧
することを特徴とするセラミンク部品の製造法によって
達成される。According to the present invention, when a ceramic component is manufactured through a mixing process of ceramic powder and a thermoplastic resin, an injection molding process of the mixed material, a degreasing process of a molded body, and a sintering process, the degreasing process and the sintering process are performed. A hydrostatic pressing step is inserted between the sintering step, and in the hydrostatic pressing step,
n: This is achieved by a method for producing a ceramic part, which is characterized in that the molded degreased body obtained through the molding step and the degreasing step in i is coated, and the coated degreased body is pressurized in a pressurizing medium.
以下に本発明の内容を更に詳細に説明する。The contents of the present invention will be explained in more detail below.
従来のセラミックタービンホイールの製造は、セラミッ
ク粉末と熱可塑性樹脂との混練工程、混線物の射出成形
工程、成形体の脱脂工程、脱脂体の焼結工程を経てなさ
れ、種々の問題が発生していたのは前述の通りである。Traditionally, ceramic turbine wheels are manufactured through a process of kneading ceramic powder and thermoplastic resin, injection molding of the mixed material, degreasing of the molded body, and sintering of the degreased body, which has resulted in various problems. As mentioned above.
そこで、本発明においては、上記脱脂工程と焼結工程と
の間に脱脂体の静水圧加圧工程を加えて成形脱脂体の均
質化を図り、成形体内部に残留している粗密部をなくし
、もって脱脂時間の短縮、およびクラックの発生防止を
実現する。したがって、新たな工程の静水圧加圧工程以
外の工程についてはその詳細な説明は省略する。Therefore, in the present invention, a hydrostatic pressing process of the degreased body is added between the degreasing process and the sintering process to homogenize the molded degreased body and eliminate the dense and dense portions remaining inside the molded body. , thereby shortening the degreasing time and preventing the occurrence of cracks. Therefore, detailed description of the steps other than the new hydrostatic pressurization step will be omitted.
以下に静水圧加圧工程を加えた本発明法について説明す
る。The method of the present invention in which a hydrostatic pressurization step is added will be explained below.
セラミックタービンホイールの製造工程において、セラ
ミック粉末と熱可塑性樹脂との混練物を射出成形して得
たタービンホイール成形体を脱脂し、この脱脂体の表面
層へ媒液中に分散させた微粉状黒鉛を噴霧して全面を覆
った。さらにその上に、媒液中に分散させた微粉状窒化
硼素を噴霧して全面を覆って二重被覆の脱脂体を得た。In the manufacturing process of ceramic turbine wheels, a turbine wheel molded body obtained by injection molding a mixture of ceramic powder and thermoplastic resin is degreased, and fine powder graphite dispersed in a medium is applied to the surface layer of this degreased body. was sprayed to cover the entire surface. Furthermore, finely powdered boron nitride dispersed in a medium was sprayed onto the surface to cover the entire surface, thereby obtaining a double-coated degreased material.
この二重被覆の脱脂体を乾燥後、シリコンゴム膜を形成
する溶液中に浸漬し乾燥させ、二重被覆脱脂体の全面を
シリコンゴムでさらに被覆した。このシリコンゴム被覆
体を加圧媒体中で等方的に加圧し、加圧後そのままの状
ｆｉ％あるいはシリコンゴムを燃焼除去した状態で焼結
する。After drying this double-coated degreased body, it was immersed in a solution for forming a silicone rubber film and dried, and the entire surface of the double-coated degreased body was further coated with silicone rubber. This silicone rubber covering is isotropically pressurized in a pressurizing medium, and after the pressurization, it is sintered as it is or in a state in which the silicone rubber has been burned off.
以上の一例に述べたように、静水圧加圧工程では、成形
脱脂体に被覆を施し、被覆した成形脱脂体に静水圧加圧
を行う。この被覆は、上記のものに限定されず、例えば
、噴霧としては小麦粉のようなものでもよく、被Ｙａ材
としてはスチレンブタジェンゴムやポリビニルアセテー
トのようなゴム類、プラスチック類などを挙げることが
できる。As described in the above example, in the hydrostatic pressing step, a molded degreased body is coated, and the coated molded defatted body is subjected to isostatic pressure. This coating is not limited to those mentioned above; for example, the spray may be made of flour, and the material to be coated may be rubbers such as styrene-butadiene rubber or polyvinyl acetate, plastics, etc. can.
また、静水圧加圧を行う媒体としては、水、グリセリン
のような液体、空気、窒素のような気体などを挙げるこ
とができ、その加圧度はセラミック成形体にもよるが、
ｔｏｏｏ〜３０００Ｋｇ／ばが好ましい。その理由は射
出成形圧を上回った静水圧を負荷する方が好ましいから
である。なお、成形工程は上記の射出成形によらず、他
の成形法でよい。In addition, examples of the medium for applying hydrostatic pressure include water, liquids such as glycerin, air, and gases such as nitrogen, and the degree of pressurization depends on the ceramic molded body.
Too~3000Kg/ba is preferable. The reason for this is that it is preferable to apply a hydrostatic pressure that exceeds the injection molding pressure. Note that the molding process is not limited to the injection molding described above, but may be performed using other molding methods.
本発明のセラミック部品製造方法においては、従来のセ
ラミック粉末と樹脂の混線工程、射出成形工程、脱脂工
程、焼結工程に加えて、脱脂工程と焼結工程との間に静
水圧加圧工程を付加される。この静水圧加圧工程では、
成形脱脂体に所望の被覆を施し、次いで所望の加圧媒体
により所定の加圧度で圧力が等方的に加えられ、成形体
内部に残留している粗密部が均質化される。In the ceramic component manufacturing method of the present invention, in addition to the conventional mixing process of ceramic powder and resin, injection molding process, degreasing process, and sintering process, a hydrostatic pressing process is performed between the degreasing process and the sintering process. will be added. In this hydrostatic pressurization process,
A desired coating is applied to the molded degreased body, and then pressure is applied isotropically at a predetermined degree using a desired pressurizing medium to homogenize the dense and dense portions remaining inside the molded body.
〔発明の作用〕の項で述べたように、セラミック成形体
は静水圧加圧工程により、セラミック成形体の内部およ
び表面ともに均質化されるために、焼結工程においてセ
ラミック成形体内の残留粗密部に起因するクラック等の
欠陥が発生せず、また成形体は均質化するので、脱脂時
間を従来の通常２０日間から約７日間にと大幅に短縮さ
れる。As described in the [Operation of the Invention] section, the ceramic molded body is homogenized both inside and on the surface by the hydrostatic pressing process, so that the remaining dense and dense portions in the ceramic molded body are removed during the sintering process. Since defects such as cracks caused by molding do not occur and the molded product becomes homogeneous, the degreasing time is significantly shortened from the conventional usual 20 days to about 7 days.
本発明の方法で製造されたセラミックタービンホイール
をつけたターボチャージャーでは、現状の金属性タービ
ンホイールをつけたターボチャージャーと比べ、同一回
転数に到達させるのに約３０％レスポンスを改良でき、
無欠陥のため長期間の使用にも問題は生じなかった。A turbocharger equipped with a ceramic turbine wheel manufactured by the method of the present invention can improve response by about 30% to reach the same rotation speed compared to a turbocharger equipped with a current metal turbine wheel.
Since there were no defects, there were no problems with long-term use.
次に本発明を実施例につき具体的に説明する。 Next, the present invention will be specifically explained using examples.
（実施例１）
アタクチックポリプロピレン１１ ｗｔ％ポリエチレン
ｅ、５ ｗｔ％
ナフタリン １．５賛ｔ％
焼結助剤を含むＳ！３ Ｎ ４ Ｂ１．Ｏｗｔ％なる組
成の混練物を射出成形してターボチャジャ−用タービン
ホイールを成形した。この成形体を窒素雰囲気中で７日
間で最高５００℃まで加熱して脱脂を完了した。こうし
て得た脱脂体の表面を微粒状黒鉛（日本アチソンに、に
、製エアロダックＧ）をスプレーで噴霧して被覆した。(Example 1) Atactic polypropylene 11 wt% polyethylene e, 5 wt% naphthalene 1.5 wt% S containing sintering aid! 3 N 4 B1. A turbine wheel for a turbocharger was molded by injection molding the kneaded material having a composition of 0 wt %. This molded body was heated to a maximum of 500° C. in a nitrogen atmosphere for 7 days to complete degreasing. The surface of the thus obtained degreased body was coated by spraying fine particulate graphite (Aerodac G, manufactured by Acheson Japan).
さらにその上にポロンスプレー（電気化学工業に、に、
製）で窒化硼素粉末を被覆した。５０°Ｃで２０分間位
風乾後、シリコンゴムがトルエン奴液中に分散されてい
る５Ｈ−２３７クリアー（東しシリコンに、Ｋ。Furthermore, on top of that, Poron spray (to Denki Kagaku Kogyo, to,
Coated with boron nitride powder. After air-drying at 50°C for about 20 minutes, apply 5H-237 clear (to silicone, K) in which silicone rubber is dispersed in toluene solution.
製）に全体を浸漬して再度５０℃で２０分間風乾し、シ
リコンゴム膜を形成させて黒鉛／窒化硼素／シリコンゴ
ムの３層で順に脱脂体を被覆した。The entire body was immersed in a solution (manufactured by Alumni Co., Ltd.) and air-dried again at 50° C. for 20 minutes to form a silicone rubber film, and the degreased body was sequentially covered with three layers of graphite/boron nitride/silicon rubber.
被覆後、脱脂体を水中で１５００ Ｋｇ／ａｄの圧力を
付加し、等方的に加圧した。加圧後、空気中でシリコン
ゴム被覆を燃焼除去した。除去後の成形体を窒素中１７
５０℃で２時間加熱して焼結体とした。焼結体は全て表
面、内部とも無欠陥の良品であった。After coating, the degreased body was placed isotropically in water under a pressure of 1500 Kg/ad. After pressurization, the silicone rubber coating was burned off in air. The molded body after removal was placed in nitrogen for 17 days.
It was heated at 50° C. for 2 hours to form a sintered body. All the sintered bodies were of good quality with no defects on the surface or inside.
（比較例１）
実施例１と同じようにして得た成形体を窒素雰囲気中で
２０日間で最高５００℃まで加熱して脱脂を完了したも
のを、静水圧加圧工程を経ずに実施例１と同条件で焼結
した。焼結体は全数にクラックが認められ、その内訳は
表面にクラックを有するもの約３０％、内部にクラック
を有するもの約７０％であった。(Comparative Example 1) A molded body obtained in the same manner as in Example 1 was heated to a maximum of 500°C in a nitrogen atmosphere for 20 days to complete degreasing. It was sintered under the same conditions as 1. Cracks were observed in all of the sintered bodies, of which about 30% had cracks on the surface and about 70% had cracks inside.
以上の実施例および比較例から明らかなように、本発明
の方法によれば、静水圧加圧工程を新たに導入すること
により、クラック等の欠陥のないセラミック部品を短い
脱脂時間で均質に得ることができることがわかる。As is clear from the above Examples and Comparative Examples, according to the method of the present invention, ceramic parts without defects such as cracks can be obtained homogeneously in a short degreasing time by newly introducing a hydrostatic pressurization process. It turns out that you can do it.
Claims (1)
練物の射出成形工程、成形体の脱脂工程および焼結工程
を経てセラミック部品を製造するに際し、前記脱脂工程
と前記焼結工程との間に静水圧加圧工程を挿入し、前記
静水圧加圧工程において、前記成形工程および脱脂工程
を経て得られた成形脱脂体に被覆を施し、この被覆脱脂
体を加圧媒体中で加圧することを特徴とするセラミック
部品の製造法。(1) When manufacturing ceramic parts through the mixing process of ceramic powder and thermoplastic resin, the injection molding process of the kneaded product, the degreasing process of the molded body, and the sintering process, there is a gap between the degreasing process and the sintering process. inserting an isostatic pressurization step in the isostatic pressurization step, applying a coating to the molded degreased body obtained through the molding process and the degreasing process, and pressurizing the coated degreased body in a pressurizing medium. A method for manufacturing ceramic parts characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59025741A JPS60168606A (en) | 1984-02-14 | 1984-02-14 | Manufacture of ceramic part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59025741A JPS60168606A (en) | 1984-02-14 | 1984-02-14 | Manufacture of ceramic part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60168606A true JPS60168606A (en) | 1985-09-02 |
| JPH0130786B2 JPH0130786B2 (en) | 1989-06-21 |
Family
ID=12174245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59025741A Granted JPS60168606A (en) | 1984-02-14 | 1984-02-14 | Manufacture of ceramic part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60168606A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163809A (en) * | 1985-01-14 | 1986-07-24 | 三菱自動車工業株式会社 | Manufacture of fine ceramics |
| JPH02171207A (en) * | 1988-12-24 | 1990-07-02 | Ngk Insulators Ltd | Ceramic injection-molded body and its molding method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520259A (en) * | 1978-07-28 | 1980-02-13 | Ngk Spark Plug Co | Production of high density sintered body |
-
1984
- 1984-02-14 JP JP59025741A patent/JPS60168606A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520259A (en) * | 1978-07-28 | 1980-02-13 | Ngk Spark Plug Co | Production of high density sintered body |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163809A (en) * | 1985-01-14 | 1986-07-24 | 三菱自動車工業株式会社 | Manufacture of fine ceramics |
| JPH02171207A (en) * | 1988-12-24 | 1990-07-02 | Ngk Insulators Ltd | Ceramic injection-molded body and its molding method |
| JPH0536204B2 (en) * | 1988-12-24 | 1993-05-28 | Ngk Insulators Ltd |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130786B2 (en) | 1989-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |