JPS621802A - Forging and sintering method under false hydrostatic pressure - Google Patents

Forging and sintering method under false hydrostatic pressure

Info

Publication number
JPS621802A
JPS621802A JP13905085A JP13905085A JPS621802A JP S621802 A JPS621802 A JP S621802A JP 13905085 A JP13905085 A JP 13905085A JP 13905085 A JP13905085 A JP 13905085A JP S621802 A JPS621802 A JP S621802A
Authority
JP
Japan
Prior art keywords
forging
high frequency
composite body
frequency heating
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.)
Pending
Application number
JP13905085A
Other languages
Japanese (ja)
Inventor
Takemori Takayama
武盛 高山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP13905085A priority Critical patent/JPS621802A/en
Publication of JPS621802A publication Critical patent/JPS621802A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F2003/026—Mold wall lubrication or article surface lubrication

Landscapes

  • Powder Metallurgy (AREA)

Abstract

PURPOSE:To easily obtain a sintered body having small anisotropy in mechanical strength by coating a composite body with a coating layer which is not heated by high frequency heating, rapidly heating only the composite body by high frequency heating, and carrying out forging and sintering by hydrostatic pressing. CONSTITUTION:A performed composite body 1 of metal/ceramics such as cermet or a sintered hard alloy contg. carbon is coated with a coating layer 2 of lubricative BN powder or the like which has a low dielectric constant and is not heated by high frequency heating. The coated composite body is put in a high frequency heating furnace 3, where only the composite body 1 is heated to >=1,200 deg.C by high frequency heating. The composite body is then set in the dies 4 of a hydrostatic forging press, and sintering and forging are carried out by applying pressure through the coating layer 2.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は擬静水圧加圧を使用して成形した金属／セラ
ミックス複合体を焼結鍛造する鍛造焼結方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a forging and sintering method for sintering and forging a metal/ceramic composite formed using quasi-isostatic pressure.

従来の技術 従来金属／セラミックス複合体を高密度化する方法とし
ては、熱間等方圧プレスを使用して焼結するＨＩＰ焼結
やホットプレス焼結、鍛造焼結などが公知である。BACKGROUND OF THE INVENTION Conventional methods for increasing the density of metal/ceramic composites include HIP sintering, hot press sintering, and forging sintering, which involve sintering using hot isostatic pressing.

発明が解決しようとする問題点 しかしＨ１ｐ焼結法は設備が高価でかつ生産性も悪いな
どの不具合がある。またホットプレスも生産性が悪く、
かつ得られた製品は機械的性質に方向性をもちやすいな
どの不具合がある。Problems to be Solved by the Invention However, the H1p sintering method has disadvantages such as expensive equipment and poor productivity. Hot press also has poor productivity.
In addition, the resulting product has problems such as a tendency to have directional mechanical properties.

さらに鍛造焼結法は比較的安価で生産性もよい反面、全
型代が高く、かつ金型寿命が短いなどの不具合がある。Furthermore, while the forging and sintering method is relatively inexpensive and has good productivity, it has disadvantages such as a high total mold cost and a short mold life.

この発明はこれらの不具合を改善する目的でなされたも
のである。This invention was made with the aim of improving these problems.

問題点を解決するための手段及び作用 高１周波加熱により加熱可能な複合体音、高周波では加
熱されない被ｆｆｉ膚で被覆してこれを高周波加熱した
後、静水圧プレスにより焼結鍛造することにより、高密
度でかつ機械的強度に方向性のない焼結体が容易に得ら
れるようにした擬静水圧鍛造焼結方法。Means to solve the problem and action height Composite body that can be heated by single-frequency heating.By covering with ffi skin which is not heated by high frequency and heating it by high frequency, sintering and forging by isostatic press. , a quasi-isostatic forging sintering method that makes it possible to easily obtain a sintered body with high density and no directionality in mechanical strength.

実施例 この発明の一実施例を図面全参照して詳述すると、予め
プレフォームした炭素を含む超硬金属、サーメット等の
金属／セラミックス複合体１をＢＮ（ボロン窒化物）な
ど、透電率が低く、高周波で加熱されない潤滑性粉体よ
りなる被覆層２で被覆する。これを高周波加熱炉３内に
投入して、高周波により金属／セラミックス複合体１の
みを１２００℃以上の温度で加熱する。Embodiment One embodiment of the present invention will be described in detail with reference to all the drawings. A preformed metal/ceramic composite 1 such as carbon-containing cemented carbide or cermet is made of a material such as BN (boron nitride) with high conductivity. It is coated with a coating layer 2 made of a lubricating powder that has a low temperature and is not heated by high frequency. This is put into a high frequency heating furnace 3, and only the metal/ceramic composite 1 is heated to a temperature of 1200° C. or higher by high frequency.

その後これを静水圧鍛造プレス機（図示せず）の金型４
内に収容して、被覆層２の周囲から加圧し焼結鍛造する
もので、高周波で急速加熱した金属／セラミックス複合
体１を被覆層２を介して焼結鍛造することにより高密度
の焼結体（製品）が得られるようになる。After that, this is molded into mold 4 of a hydrostatic forging press machine (not shown).
The metal/ceramic composite 1 is heated rapidly with high frequency and is sintered and forged through the coating layer 2, resulting in high-density sintering. body (product) will be obtained.

なお擬静水圧鍛造としたのは被覆層２を介して焼結鍛造
するためである。また複合体としては金属／高分子材料
、セラミックス／Ｃ複合体などでもよい。Note that the quasi-isostatic forging was used because sintering forging was performed through the coating layer 2. Further, the composite may be a metal/polymer material, a ceramic/C composite, or the like.

発明の効果 この発明は以上詳述したように、複合体を高周波で加熱
されない被覆層で被覆した状態で高周波により複合体の
みを急速加熱した後、静水圧７’レスにより鍛造焼結す
るようにしたことから、機械的強度に異方性の少ない焼
結体が容易に得られると共に、短時間で加熱から焼結鍛
造を行うため、超硬材やサーメツト材を使用した複合体
では、ＷＣとマトリックス相聞に析出しやすい金属間化
合物相を非常に少なくでき、かつ組織が微細化できるこ
とから靭性を暑じるしく高めることができる。また従来
のＨＩＰやホットプレスに比べて生産性の向上も図れる
ようになる。Effects of the Invention As described in detail above, the present invention is capable of rapidly heating only the composite body by high frequency while covering the composite body with a coating layer that is not heated by high frequency waves, and then forging and sintering it by hydrostatic pressure 7'less. Therefore, in order to easily obtain a sintered body with less anisotropy in mechanical strength and to perform heating and sintering forging in a short time, composites using cemented carbide or cermet materials are not suitable for WC. Since the intermetallic compound phase that tends to precipitate between matrix layers can be greatly reduced and the structure can be made finer, toughness can be dramatically improved. Furthermore, productivity can be improved compared to conventional HIP and hot press.

【図面の簡単な説明】[Brief explanation of the drawing]

図面はこの発明の一実施例を示し、第１図は加熱状態の
説明図、第２図は焼結鍛造状態の説明図である。 １は複合体、２は被覆層。The drawings show an embodiment of the present invention, with FIG. 1 being an explanatory diagram of a heated state, and FIG. 2 being an explanatory diagram of a sintering and forging state. 1 is a composite, 2 is a coating layer.

Claims (1)

【特許請求の範囲】[Claims] 　高周波加熱により加熱可能な複合体１を、高周波では
加熱されない被覆層２で被覆してこれを高周波加熱した
後、静水圧プレスにより焼結鍛造することを特徴とする
擬静水圧鍛造焼結方法。A quasi-isostatic forging and sintering method characterized in that a composite body 1 that can be heated by high-frequency heating is coated with a coating layer 2 that is not heated by high-frequency heating, and then subjected to high-frequency heating, and then sintered and forged using an isostatic press.
JP13905085A 1985-06-27 1985-06-27 Forging and sintering method under false hydrostatic pressure Pending JPS621802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13905085A JPS621802A (en) 1985-06-27 1985-06-27 Forging and sintering method under false hydrostatic pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13905085A JPS621802A (en) 1985-06-27 1985-06-27 Forging and sintering method under false hydrostatic pressure

Publications (1)

Publication Number Publication Date
JPS621802A true JPS621802A (en) 1987-01-07

Family

ID=15236302

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13905085A Pending JPS621802A (en) 1985-06-27 1985-06-27 Forging and sintering method under false hydrostatic pressure

Country Status (1)

Country Link
JP (1) JPS621802A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05500940A (en) * 1989-10-19 1993-02-25 東洋アルミニウム株式会社 Method for heat treating ceramics that are decomposed and/or oxidized by heat treatment in oxygen-containing gas by microwave heating, and susceptor used therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05500940A (en) * 1989-10-19 1993-02-25 東洋アルミニウム株式会社 Method for heat treating ceramics that are decomposed and/or oxidized by heat treatment in oxygen-containing gas by microwave heating, and susceptor used therefor

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