JP2893829B2 - Manufacturing method of hollow sintered body - Google Patents
Manufacturing method of hollow sintered bodyInfo
- Publication number
- JP2893829B2 JP2893829B2 JP2083822A JP8382290A JP2893829B2 JP 2893829 B2 JP2893829 B2 JP 2893829B2 JP 2083822 A JP2083822 A JP 2083822A JP 8382290 A JP8382290 A JP 8382290A JP 2893829 B2 JP2893829 B2 JP 2893829B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- sintered body
- powder
- hollow
- sintering
- 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
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、中子を使用して中空形状の焼結体をプラズ
マ焼結法により製造する中空焼結体の製造方法に関す
る。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a hollow sintered body using a core to manufacture a hollow sintered body by a plasma sintering method.
（従来の技術） 従来の中空焼結体は単純な形状のもの以外は、最終的
に製造しようとする中空焼結体の形状を複数個に分割し
て個々に焼結し、該分割して焼結された個々の部分をろ
う付け等により連結し、分割前の中空焼結体の形状を得
ていた。(Prior Art) Conventional hollow sintered bodies other than those having a simple shape are divided into a plurality of hollow sintered bodies to be finally manufactured, each of which is sintered individually. The individual sintered parts are connected by brazing or the like to obtain the shape of the hollow sintered body before division.
該製造方法では、複数個の部分に分割して焼結するた
め、工程及び工数が増加するばかりでなく、ろう付け等
による連結部分の信頼性が充分でないため、検査工程に
係る工数の増加及び歩留まりの低下等の問題がある。In the manufacturing method, since the process is divided into a plurality of portions and sintered, not only the number of steps and man-hours are increased, but also the reliability of the connection portion by brazing or the like is not sufficient, so that the number of steps related to the inspection process is increased and There are problems such as a decrease in yield.
該問題を解決するために、樹脂等にて中子を作成し、
該中子を用いて射出成形したのち、焼結炉内にて加熱
し、焼結すると共に中子を揮散除去し、中空焼結体を一
体として製造する方法が、特開昭59−145104号公報に記
載されているが、中子と焼結体とを形成するそれぞれの
材料の熱膨張係数が異なると、加熱の際に焼結体が破損
するおそれがあるため、中子と焼結体との材料の組み合
わせが制限されるという問題がある。To solve the problem, create a core with resin, etc.
After injection molding using the core, a method of heating in a sintering furnace, sintering and volatilizing and removing the core, and manufacturing a hollow sintered body integrally is disclosed in JP-A-59-145104. Although described in the gazette, if the materials forming the core and the sintered body have different coefficients of thermal expansion, the sintered body may be damaged during heating. There is a problem that the combination of materials is limited.
そこで、可溶性の樹脂で作成された中子を用いて成形
した後に、焼結工程に先立って中子を溶解除去すること
により破損の危険性のない中空焼結体を製造する方法
が、特開昭61−205103号公報に記載されている。Therefore, after molding using a core made of a soluble resin, a method of producing a hollow sintered body without the risk of breakage by dissolving and removing the core prior to the sintering step, It is described in JP-A-61-205103.
（発明が解決しようとする課題） このような従来の、焼結工程に先立って中子を溶解除
去する方法では、焼結工程にて加熱される際に発生する
熱応力による歪を拘束することができず、焼結された中
空焼結体の形状精度が劣化するという問題がある。(Problems to be Solved by the Invention) In such a conventional method of dissolving and removing the core prior to the sintering step, strain caused by thermal stress generated when the core is heated in the sintering step is restrained. However, there is a problem that the shape accuracy of the sintered hollow sintered body is deteriorated.
（課題を解決するための手段） 本発明は、上記の点に鑑みてなされたもので、焼結工
程での破損のおそれがなく、かつ形状精度の優れた中空
焼結体の製造方法を提供しようとするものである。(Means for Solving the Problems) The present invention has been made in view of the above points, and provides a method of manufacturing a hollow sintered body that has no risk of breakage in a sintering step and has excellent shape accuracy. What you want to do.
本発明によれば、金属粉体か、あるいはセラミック等
の非導電体からなる粉体粒子表面が金属等の導電体で被
覆されている粉体を、樹脂からなる中子と共に型に充填
し密閉する。According to the present invention, a metal powder or a powder having a non-conductive powder particle surface made of a ceramic or the like coated with a conductive material such as a metal is filled in a mold together with a core made of a resin and sealed. I do.
そして該粉体をプラズマ焼結法、すなわち所定の圧力
で押圧すると共にパルス電流を該粉体に流し、粉体粒子
相互間にプラズマ放電を発生させ、該粉体を焼結する。Then, the powder is pressed by a plasma sintering method, that is, a predetermined pressure, and a pulse current is applied to the powder to generate a plasma discharge between the powder particles, thereby sintering the powder.
そして、プラズマ焼結後に、該焼結体を所定温度まで
加熱し中子を揮散除去させ、中空焼結体を製造する中空
焼結体の製造方法を提供できる。Then, after the plasma sintering, a method for manufacturing a hollow sintered body can be provided in which the sintered body is heated to a predetermined temperature to volatilize and remove the core, thereby manufacturing a hollow sintered body.
（作用） 本発明の中空焼結体の製造方法では、粉体をプラズマ
焼結法により焼結するので、粉体粒子間に発生するプラ
ズマ放電により該粉体粒子表面の酸化被膜等が除去さ
れ、該表面が活性化され、粉体粒子は強固に結合され
る。(Operation) In the method for producing a hollow sintered body of the present invention, since the powder is sintered by the plasma sintering method, the oxide film on the surface of the powder particles is removed by plasma discharge generated between the powder particles. The surface is activated and the powder particles are firmly bonded.
また、プラズマ焼結法は、粉体粒子間に発生する微小
なプラズマ放電の熱により焼結するので、粉体全体の温
度は余り上昇しないので中子が溶融せず、また密閉状態
で焼結するので、破損のおそれがなく、形状精度に優れ
た中空焼結体を製造することができる。In the plasma sintering method, the sintering is performed by the heat of minute plasma discharge generated between the powder particles, so that the temperature of the entire powder does not rise so much that the core does not melt and the sintering is performed in a closed state. Therefore, there is no possibility of breakage, and a hollow sintered body having excellent shape accuracy can be manufactured.
（実施例） 以下、本発明の実施例を図面に従って詳細に説明す
る。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図は、プラズマ焼結装置の概略を示す断面図である。 FIG. 1 is a sectional view schematically showing a plasma sintering apparatus.
本図（ａ）において、１はシリンダ形状の型であり、
該型１の内部には粉体２と中子３とが２個の電極４によ
って密封されている。In this figure (a), 1 is a cylinder-shaped mold,
Inside the mold 1, a powder 2 and a core 3 are sealed by two electrodes 4.
尚、該型１は非導電体もしくは内周面が非導電体で被
覆されており、電極４は、超硬合金もしくは黒鉛から形
成されている。The mold 1 has a non-conductive material or an inner peripheral surface coated with a non-conductive material, and the electrode 4 is made of a cemented carbide or graphite.
また、粉体２は鉄、銅、アルミニウム、ニッケル、コ
バルト等の金属材料や、セラミックからなる粉体粒子表
面に、無電解鍍金法等により金属被膜を被着させたもの
のうちから、中空焼結体の使用目的に応じて適宜選択さ
れた材料から構成される。The powder 2 may be made of a metal material such as iron, copper, aluminum, nickel, or cobalt, or a powder particle made of ceramic, on which metal coating is applied by electroless plating or the like. It is composed of materials appropriately selected according to the purpose of use of the body.
更に、中子はポリプロピレン、ポリカーボネート、ポ
リエチレン、あるいはナイロンといった樹脂、もしくは
これら樹脂に黒鉛等を混入させ導電性を付与した導電性
樹脂から形成されている。Further, the core is formed of a resin such as polypropylene, polycarbonate, polyethylene, or nylon, or a conductive resin obtained by mixing graphite or the like into these resins to impart conductivity.
ところで、本図（ｂ）は、上記中子３の形状を示す斜
視図であるが、本図のごとき矩形状に限定されるもので
はない。Incidentally, FIG. 2B is a perspective view showing the shape of the core 3, but is not limited to a rectangular shape as shown in FIG.
次に、プラズマ焼結を行なうため、上記のごとく密封
した状態で、電極４に応力を印加し、内部の粉体２を約
1000Kg/cm2の圧力で圧縮する。Next, in order to perform plasma sintering, a stress is applied to the electrode 4 in the sealed state as described above, and the powder
Compress at a pressure of 1000 kg / cm 2 .
そして、該圧縮と共に、1000KVの電圧で2000cpmのパ
ルス数のパルス電力を、パルス電源５から両電極４間に
10〜100秒間供給する。Along with the compression, a pulse power of a pulse number of 2000 cpm at a voltage of 1000 KV is applied between the pulse power source 5 and both electrodes 4
Supply for 10-100 seconds.
尚、該パルス電源５は内部の直流電源51からの直流電
力を、可変抵抗52及びスイッチング素子53を介して一旦
コンデンサ54に蓄電し、該蓄電された電力を、断続して
開閉するスイッチング素子55によりパルス電力とし出力
するものである。そして、スイッチング素子53及び55は
コントロールユニット56からの制御信号により開閉され
る。The pulse power supply 5 temporarily stores DC power from an internal DC power supply 51 via a variable resistor 52 and a switching element 53 in a capacitor 54, and switches the stored power intermittently to open and close. And outputs as pulse power. The switching elements 53 and 55 are opened and closed by a control signal from the control unit 56.
そして最後に、上記のようにプラズマ焼結が終了する
と、型１から焼結体を取り出し、200℃程度まで加熱し
て中子３を揮散除去し、中空焼結体を得る。Finally, when the plasma sintering is completed as described above, the sintered body is taken out of the mold 1 and heated to about 200 ° C. to volatilize and remove the core 3, thereby obtaining a hollow sintered body.
以上、本発明の実施例について詳細に説明したが、本
発明の精神から逸れないかぎりで、種々の異なる実施例
は容易に構成できるから、本発明は前記特許請求の範囲
において記載した限定以外、特定の実施例に制約される
ものではない。As described above, the embodiments of the present invention have been described in detail. However, various different embodiments can be easily configured without departing from the spirit of the present invention. It is not limited to a particular embodiment.
（発明の効果） 以上説明したように、本発明によれば、樹脂からなる
中子を用い、プラズマ焼結法にて焼結した後中子を揮散
除去するので、破損のおそれがなく、形状精度に優れ、
複雑な中空形状の焼結体を一体として製造することがで
きる。(Effects of the Invention) As described above, according to the present invention, a core made of a resin is used, and after sintering by a plasma sintering method, the core is volatilized and removed. Excellent accuracy,
A complicated hollow shaped sintered body can be manufactured integrally.
図は、プラズマ焼結装置の概略を示す断面図である。 １……型、２……粉体、３……中子、４……電極、５…
…パルス電源。FIG. 1 is a sectional view schematically showing a plasma sintering apparatus. 1 ... mold, 2 ... powder, 3 ... core, 4 ... electrode, 5 ...
... pulse power supply.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｂ２８Ｂ 7/34 Ｃ０４Ｂ 35/64 Ｅ (56)参考文献 特開 昭59−145104（ＪＰ，Ａ) 特開 昭61−205103（ＪＰ，Ａ) 特開 昭57−57802（ＪＰ，Ａ) 特開 平１−123008（ＪＰ，Ａ) 特公 昭43−14573（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.6，ＤＢ名) B22F 3/00 - 5/12 C04B 35/64 - 35/645 B28B 7/34 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification symbol FI // B28B 7/34 C04B 35/64 E (56) References JP-A-59-145104 (JP, A) JP-A-61- 205103 (JP, A) JP-A-57-57802 (JP, A) JP-A-1-123008 (JP, A) JP-B-43-14573 (JP, B1) (58) Fields investigated (Int. 6 , DB name) B22F 3/00-5/12 C04B 35/64-35/645 B28B 7/34
Claims (6)
る粉体を、樹脂からなる中子と共に型に充填し密閉する
ステップと、該密閉された粉体をプラズマ焼結法により
通電焼結するステップと、該通電焼結された粉体と中子
とを加熱し該中子を揮散除去するステップとを有するこ
とを特徴とする中空焼結体の製造方法。1. A step of filling a powder having at least the surface of powder particles having conductivity with a core made of a resin into a mold and sealing the mold, and electrically sintering the sealed powder by a plasma sintering method. And a step of heating the current-sintered powder and the core to volatilize and remove the core.
面に金属からなる被着層が被着されているものであるこ
とを特徴とする請求項（１）記載の中空焼結体の製造方
法。2. The method for producing a hollow sintered body according to claim 1, wherein said powder particles are formed by depositing an adhesion layer made of metal on the surface of particles made of ceramic. .
する請求項（１）記載の中空焼結体の製造方法。3. The method according to claim 1, wherein the powder particles are made of metal.
請求項（１）記載の中空焼結体の製造方法。4. The method according to claim 1, wherein the core is made of a resin.
ート、ポリエチレン及びナイロンのうちの少なくとも１
種類からなることを特徴とする請求項（１）記載の中空
焼結体の製造方法。5. The core is at least one of polypropylene, polycarbonate, polyethylene and nylon.
The method for producing a hollow sintered body according to claim 1, wherein the hollow sintered body is made of different types.
とする請求項（１）記載の中空焼結体の製造方法。6. The method according to claim 1, wherein the core is made of a conductive resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2083822A JP2893829B2 (en) | 1990-03-30 | 1990-03-30 | Manufacturing method of hollow sintered body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2083822A JP2893829B2 (en) | 1990-03-30 | 1990-03-30 | Manufacturing method of hollow sintered body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03285001A JPH03285001A (en) | 1991-12-16 |
| JP2893829B2 true JP2893829B2 (en) | 1999-05-24 |
Family
ID=13813386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2083822A Expired - Lifetime JP2893829B2 (en) | 1990-03-30 | 1990-03-30 | Manufacturing method of hollow sintered body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2893829B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180304362A1 (en) * | 2017-04-21 | 2018-10-25 | Mikro Systems, Inc. | Systems, devices and methods for spark plasma sintering |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0503639B1 (en) * | 1991-03-15 | 1995-03-08 | Sony Corporation | Polycristalline ferrite materials |
| JP2010168610A (en) * | 2009-01-21 | 2010-08-05 | Elenix Inc | Method for producing sintering stock with fine through-hole, and sintering stock with fine through-hole |
-
1990
- 1990-03-30 JP JP2083822A patent/JP2893829B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180304362A1 (en) * | 2017-04-21 | 2018-10-25 | Mikro Systems, Inc. | Systems, devices and methods for spark plasma sintering |
| EP3391982A3 (en) * | 2017-04-21 | 2019-02-27 | Mikro Systems Inc. | Systems, devices and methods for spark plasma sintering |
| US11229950B2 (en) | 2017-04-21 | 2022-01-25 | Raytheon Technologies Corporation | Systems, devices and methods for spark plasma sintering |
| EP4039392A1 (en) * | 2017-04-21 | 2022-08-10 | Raytheon Technologies Corporation | Systems, devices and methods for spark plasma sintering |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03285001A (en) | 1991-12-16 |
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