JPH0499104A - Capsule structure of green compact for sintering and manufacture of sintered body with this capsule - Google Patents
Capsule structure of green compact for sintering and manufacture of sintered body with this capsuleInfo
- Publication number
- JPH0499104A JPH0499104A JP2210058A JP21005890A JPH0499104A JP H0499104 A JPH0499104 A JP H0499104A JP 2210058 A JP2210058 A JP 2210058A JP 21005890 A JP21005890 A JP 21005890A JP H0499104 A JPH0499104 A JP H0499104A
- Authority
- JP
- Japan
- Prior art keywords
- sintering
- melting point
- layer
- capsule
- powder
- 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
- 238000005245 sintering Methods 0.000 title claims abstract description 52
- 239000002775 capsule Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000843 powder Substances 0.000 claims abstract description 77
- 239000002184 metal Substances 0.000 claims abstract description 75
- 229910052751 metal Inorganic materials 0.000 claims abstract description 75
- 239000010410 layer Substances 0.000 claims abstract description 46
- 239000011247 coating layer Substances 0.000 claims abstract description 31
- 239000011148 porous material Substances 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims description 67
- 230000008018 melting Effects 0.000 claims description 66
- 239000000919 ceramic Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 5
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 25
- 238000001764 infiltration Methods 0.000 description 8
- 230000008595 infiltration Effects 0.000 description 8
- 229910001111 Fine metal Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 208000037584 hereditary sensory and autonomic neuropathy Diseases 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は焼結用成形体のカプセル構造及びそのカプセル
による焼結体の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a capsule structure of a molded body for sintering and a method for manufacturing a sintered body using the capsule.
［従来の技術］
近年、金属粉末、セラミック粉末等の粉末原料を焼結す
る方法として種々の提案がある。これらのうち、■粉末
原料を軟鋼板製容器等の可塑性があり、かつ、気密を保
ち得るカプセル中に封入して、これをガスまたは液体の
流体を圧力媒体として、加圧すると同時に加熱し、粉末
原料を高温高圧下で焼結する熱間等方向加圧焼結法（Ｈ
ｏｔｌｓｏｓｔａｔｉｃ Ｐｒｅｓｓｉｎｇ、略してＨ
ＩＰ法と称する〉が優れた粉末焼結方法として知られて
いる。また、■粉末原料を充填したカプセルを炉内に配
置し、カプセルを真空ポンプに継いで、加熱、加圧中に
カプセル内を脱気する粉末加圧焼結方法がある（特開平
１−１１１８０２号公報）、更に■上記のようなカプセ
ルの代わりに、粉末原料を圧粉体とし、その圧粉体の焼
結温度よりも融点が高く、圧粉体の焼結温度よりも低い
温度で焼結可能な金属微粉末を圧粉体の全表面に付着し
、これを減圧下で加熱して金属微粉末を焼結して、圧粉
体を包む気密性のシール膜を形成すると同時に圧粉体の
中を脱気し、その後これを圧媒ガス中で加圧状態で加熱
して圧粉体を焼結する方法がある（特開昭６３−２１０
２０１号公報）、その外■成形体を予め金属微粉末また
はガラス粉末中に埋没し、焼結閉気孔化した塊とする方
法がある。[Prior Art] In recent years, various proposals have been made as methods for sintering powder raw materials such as metal powder and ceramic powder. Among these, (1) encapsulating the powder raw material in a plastic and airtight capsule such as a container made of a mild steel plate, pressurizing and simultaneously heating it using a gas or liquid fluid as a pressure medium; The hot isostatic pressure sintering method (H
otlsostatic Pressing, abbreviated as H
The IP method is known as an excellent powder sintering method. There is also a powder pressure sintering method in which a capsule filled with powder raw materials is placed in a furnace, the capsule is connected to a vacuum pump, and the inside of the capsule is degassed during heating and pressurization (Japanese Patent Application Laid-Open No. 1-111802). In addition, instead of the above-mentioned capsules, the powder raw material is used as a green compact, and the melting point is higher than the sintering temperature of the green compact, and it is sintered at a temperature lower than the sintering temperature of the green compact. A fine metal powder that can be sintered is attached to the entire surface of the green compact, and this is heated under reduced pressure to sinter the fine metal powder, forming an airtight sealing film surrounding the green compact, and simultaneously releasing the green compact. There is a method of deaerating the inside of the body and then heating it under pressure in a pressure medium gas to sinter the compact (Japanese Patent Laid-Open No. 63-210
In addition, there is a method in which the molded body is previously embedded in fine metal powder or glass powder and sintered into a closed-pored mass.
［発明が解決しようとする課題］
しかしながら、上述した方法は以下のような問題がある
。[Problems to be Solved by the Invention] However, the above-described method has the following problems.
■、■に示した方法はいずれも軟鋼板等によるメタルカ
プセルを必要とし、成形出来る形状に限度があり、また
メタルカプセルの作製に溶接等を必要とし、製造コスト
が高くなる。Both of the methods shown in (1) and (2) require a metal capsule made of a mild steel plate or the like, which limits the shape that can be formed, and requires welding, etc. to produce the metal capsule, resulting in high manufacturing costs.
■に示した方法は圧粉体の表面を金属微粉末の焼結によ
るシール膜で包むものであり、その焼結形成にあたり、
加熱して、その温度て゛一定時間保持することが必要で
あり、時間力ｆ長くなるとともに、その間に圧粉体の組
織力（粗大イヒするために閉気孔化に悪影響を与える場
合力くある。The method shown in (2) covers the surface of the green compact with a sealing film made by sintering fine metal powder.
It is necessary to heat the powder and hold it at that temperature for a certain period of time, which increases the time f and increases the texture (coarseness) of the powder compact during that time, which can adversely affect the formation of closed pores.
■に示した方法は、予め成形体を金属微粉末中に埋没す
る場合は、使ν１捨てどなる材料力（多く、閉気孔化し
塊となった封人材の除去力；困難である。更に、セラミ
・ンク粒子に埋没する場合（よ、熱電導率の低いセラミ
・ンクを圧力媒体とするためＣ二処理時間が長くなる。In the method shown in (2), if the molded body is embedded in fine metal powder in advance, the material force (in many cases, the removal of the sealing material that has closed pores and formed a lump) is difficult.・In the case of embedding in ink particles, the C2 treatment time will be longer because ceramic ink with low thermal conductivity is used as the pressure medium.
ガラス粉末中に埋没する場合は、軟化したガラスから発
生するガス力（材料特性を阻害し、製品の目的材質力（
金属の場合、成形体とガラスの熱膨張率の違し）からガ
ラスの塊力＜ ＩＩれ、封入が困難である。When buried in glass powder, the gas force generated from the softened glass (disturbs the material properties, and the intended material force (
In the case of metal, it is difficult to encapsulate the glass because of the difference in coefficient of thermal expansion between the molded body and the glass.
本発明は上記のような問題点の解決を図ったものであり
、成形する形状を自由巳こ選択出来、安価に緻密な焼結
体を造ることの出来るカプセｌし構造及び焼結体の製造
方法を提供することを目的とする。The present invention is an attempt to solve the above-mentioned problems, and provides a capsule structure and a method for producing a sintered body, which allows the user to freely select the shape to be molded and produce a dense sintered body at low cost. The purpose is to provide a method.
［：ａ題を解決するための手段及び作用］上記目的を達
成するために、本発明は焼結用成形体のカプセルであっ
て、前記成形体の焼結温度より低い融点を持った金属系
粉末（以降低融点金属粉末と云う）及び前記焼結温度よ
り高い融点を持った金属系粉末（以降高融点金属粉末と
云う）のコーティング層を溶浸により、閉気孔化した焼
結用成形体のカプセル構造とするものである。この場合
カプセルの内面に成形体と反応しないセラミック層を設
けることが出来る。[Means and effects for solving problem a] In order to achieve the above object, the present invention provides a capsule for a molded body for sintering, which comprises a metal-based capsule having a melting point lower than the sintering temperature of the molded body. A molded body for sintering in which a coating layer of a powder (hereinafter referred to as low melting point metal powder) and a metal powder having a melting point higher than the sintering temperature (hereinafter referred to as high melting point metal powder) is made into closed pores by infiltration. It has a capsule structure. In this case, a ceramic layer that does not react with the molded body can be provided on the inner surface of the capsule.
また、焼結用成形体の表面に、前記成形体の焼結温度よ
り、低融点金属粉末と高融点金属粉末をコーティングし
て層を形成し、これを低融点金属粉末の融点以上で昇温
して、溶浸してコーティング層を閉気孔化し、これを熱
間加圧処理したカプセルによる焼結体の製造方法とする
ものである。Furthermore, a layer is formed by coating the surface of the compact for sintering with a metal powder having a low melting point and a powder having a high melting point above the sintering temperature of the compact, and the temperature of this layer is raised to a temperature above the melting point of the low melting point metal powder. This is a method for manufacturing a sintered body using a capsule in which the coating layer is made into closed pores by infiltration and then subjected to hot pressure treatment.
本発明の対象とする焼結用成形体は金属粉末、セラミッ
ク粉末それらの複合粉末等を圧粉等各種成形法により作
製したものを使用する。金属粉末としでは鉄粉末、高速
度工具＃４粉末等かある。セラミック粉末としては窒化
ケイ素、炭化ケイ素、ホウ化チタン等がある。本発明は
カプセルかコテイング層によるものであり、且溶漫カプ
セルとすることが必要である。即ち溶浸カプセルの作製
にあたっては、焼結用成形体の表面に成形体の焼結温度
より低融点の金属粉末と、高融点の金属粉末をコーティ
ングして、コーティング層を形成し、低融点金属粉末の
融点以上に昇温しで、そのコーティング層を溶浸して閉
気孔化するものである。即ち低融点金属粉末を、その融
点以上に昇温することで、高融点金属粉末へ溶浸させ、
焼結による場合よりも短時間で封入処理を完了出来る。The molded body for sintering which is the object of the present invention is produced by molding metal powder, ceramic powder, composite powder thereof, etc. by various molding methods such as powder compaction. Examples of metal powder include iron powder and high speed tool #4 powder. Examples of ceramic powders include silicon nitride, silicon carbide, and titanium boride. The present invention is based on a capsule or coating layer, and it is necessary to form a soluble capsule. That is, in producing an infiltrated capsule, the surface of a compact for sintering is coated with a metal powder with a melting point lower than the sintering temperature of the compact and a metal powder with a high melting point to form a coating layer. By raising the temperature above the melting point of the powder, the coating layer is infiltrated and the pores are closed. That is, by heating the low melting point metal powder above its melting point, it is infiltrated into the high melting point metal powder,
Encapsulation processing can be completed in a shorter time than when using sintering.
溶浸した低融点金属の融液は、高融点金属と反応し融点
が上昇する。これにより、焼結温度よりも低い温度で封
入処理が出来、かつ、焼結温度でも、溶融しない封入カ
プセルとなる。また、カプセル構造は目的製品形状の型
を基にしてコーティング層を形成し、目的原料粉末を充
填して、その充填口を封止し、低融点金属粉末の融点以
上に昇温して、そのコーティング層を溶浸して閉気孔化
することも出来る。The melt of the infiltrated low melting point metal reacts with the high melting point metal and its melting point increases. As a result, the encapsulation process can be performed at a temperature lower than the sintering temperature, and the encapsulated capsule does not melt even at the sintering temperature. In addition, the capsule structure is made by forming a coating layer based on the mold of the desired product shape, filling it with the desired raw material powder, sealing the filling port, and heating it above the melting point of the low-melting point metal powder. The coating layer can also be infiltrated to form closed pores.
本発明で、上記のように低融点と、高融点の複数の金属
粉末のコーティング層としたのは、これを真空中で加熱
して、低融点金属粉末による層を融解して、高融点金属
粉末による層中に溶浸するためである。これによって高
融点金属粉末による層をガス不透過膜とすることが出来
る。 ここにおいて金属系粉末（低融点金属粉末、高融
点金属粉末〉は金属粉末、合金粉末、それらの粉末とセ
ラミック粉末の混合粉末を云うものである。これらの粉
末は成形体に対応して適宜選択することが出来る。しか
し、選択において溶浸する低融点金属粉末と、溶浸され
る高融点金属粉末を選択することが必要である。In the present invention, the coating layer of a plurality of metal powders with a low melting point and a plurality of high melting point metal powders is formed as described above by heating this in a vacuum to melt the layer of low melting point metal powders, and then forming a coating layer of a high melting point metal powder. This is to infiltrate into the powder layer. This allows the layer of high melting point metal powder to be made into a gas impermeable membrane. Here, metal powder (low melting point metal powder, high melting point metal powder) refers to metal powder, alloy powder, and mixed powder of these powders and ceramic powder. These powders are selected as appropriate depending on the molded object. However, it is necessary to select a low melting point metal powder to be infiltrated and a high melting point metal powder to be infiltrated.
本発明による焼結体の製造方法は上記のような焼結用成
形体を包んだカプセルを熱間加圧処理して製造するもの
である。熱間加圧処理は、ＨＩＰ法等によって行なう。The method for manufacturing a sintered body according to the present invention is to hot pressurize a capsule enclosing a sintering molded body as described above. The hot press treatment is performed by HIP method or the like.
ここては焼結緻密化に必要な圧力と温度を加えることに
より、目的とする焼結体を作製することが出来る。Here, the desired sintered body can be produced by applying the pressure and temperature necessary for sintering and densification.
［実施例］ 以下本発明の実施例を図によって説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第１図（ａ）、（ｂ）は本発明の一実施例の断面を示す
図であり、（ａ）図はコーティングした状態を示す図、
（ｂ）は溶浸したコーティング層を示す図である。１は
焼結用成形体、２ａ、２ｂは高融点金属層、３は低融点
金属層、溶浸コーティング層４を示す、（ａ）図におい
て本発明のカプセル構造は焼結用成形体１の表面にコー
ティングにより、高融点金属層２ａを形成し、その上に
低融点金属層３をコーティングし、更に高融点金属層２
ｂを形成したコーティング層からなっている。ここでは
焼結用成形体１として鉄粉、高融点金属層２ａ、２ｂと
して純鉄粉、低融点金属層３として、１ｗｔ％Ｃ２，５
ｖｔ％Ｂ−１，５ｗｔ％Ｓｉ、残部Ｆｅを用いた。（ｂ
）図は（ａ）図のコーティング層を真空中で加熱して、
低融点金属粉末による層を融解して、高融点金属粉末に
よる層中に溶浸して形成した溶浸コーティング層４であ
る。FIGS. 1(a) and 1(b) are diagrams showing a cross section of an embodiment of the present invention, and FIG. 1(a) is a diagram showing a coated state;
(b) shows the infiltrated coating layer. 1 is a molded body for sintering, 2a and 2b are high melting point metal layers, 3 is a low melting point metal layer, and an infiltration coating layer 4. In the figure (a), the capsule structure of the present invention is the molded body for sintering 1. A high melting point metal layer 2a is formed on the surface by coating, a low melting point metal layer 3 is coated thereon, and a high melting point metal layer 2a is further coated on the surface.
It consists of a coating layer formed with b. Here, iron powder is used as the compact for sintering 1, pure iron powder is used as the high melting point metal layers 2a and 2b, and 1wt% C2,5 is used as the low melting point metal layer 3.
vt%B-1, 5wt%Si, and balance Fe were used. (b
) The figure shows (a) heating the coating layer in figure in vacuum,
The infiltration coating layer 4 is formed by melting a layer of low melting point metal powder and infiltrating it into a layer of high melting point metal powder.
第２図（ａ）、（ｂ）は本発明の他の実施例の断面を示
す図であり、（ａ）図はコーティングした状態を示す図
、（ｂ）は溶浸したコーティング層を示す図である。、
５はセラミック層を示す。FIGS. 2(a) and 2(b) are cross-sectional views of other embodiments of the present invention, with (a) showing a coated state and (b) showing an infiltrated coating layer. It is. ,
5 indicates a ceramic layer.
ここではセラミ・γり層５として、アルミナ粉末を用い
た。（ａ）図において本発明のカプセル構造は焼結用成
形体１の表面にコーティングにより、セラミック層５を
形成し、高融点金属層２ａを形成し、その上に低融点金
属層３をコーティングし、更に高融点金属層２ｂを形成
したコーティング層からなっている。（ｂ）図は（ａ）
図のコティング層を真空中で加熱して、低融点金属粉末
による層を融解して、高融点金属粉末による層中に溶浸
して形成した溶浸コーティング層４である。溶浸コーテ
ィング層４の内面にはセラミック層５を形成している。Here, alumina powder was used as the ceramic/gamma layer 5. In the figure (a), the capsule structure of the present invention includes a ceramic layer 5 formed by coating on the surface of a sintering compact 1, a high melting point metal layer 2a, and a low melting point metal layer 3 coated thereon. , a coating layer further comprising a high melting point metal layer 2b. (b) The figure is (a)
This is an infiltration coating layer 4 formed by heating the coating layer shown in the figure in a vacuum to melt the layer of low melting point metal powder and infiltrating it into the layer of high melting point metal powder. A ceramic layer 5 is formed on the inner surface of the infiltration coating layer 4.
セラミック層５は焼結用成形体とコーティング層との間
にあって、両者の反応を防止する役割をはたしている。The ceramic layer 5 is located between the sintering molded body and the coating layer, and serves to prevent reactions between the two.
従って焼結用成形体とコーティング層とで反応しやすい
材料を扱う場合は、このカプセル構造を用いることが好
ましい。Therefore, when handling materials that are likely to react between the sintering compact and the coating layer, it is preferable to use this capsule structure.
本発明の焼結方法は、焼結用成形体の表面に、前記成形
体の焼結温度より、低融点金属粉末と高融点金属粉末を
コーティングして層を形成し、これを低融点金属粉末の
融点以上で昇温して、溶浸してコーティング層を閉気孔
化し、これを熱間加圧処理して、焼結体の製造方法とす
るものである。熱間加圧処理はＨＩＰ法等によって行な
う。In the sintering method of the present invention, a layer is formed by coating the surface of a compact for sintering with a low melting point metal powder and a high melting point metal powder at a temperature higher than the sintering temperature of the compact. In this method, a sintered body is produced by raising the temperature to a temperature higher than the melting point of the sintered body, infiltrating the coating layer to make the coating layer closed, and subjecting it to hot pressure treatment. The hot press treatment is performed by HIP method or the like.
次に本発明のカプセルによる焼結体の製造方法の実験例
を詳述する。Next, an experimental example of the method for manufacturing a sintered body using a capsule of the present invention will be described in detail.
（実験例）
焼結用成形体として鉄粉、高融点金属層として純鉄粉、
低融点金属層として、１ ｗｔ％Ｃ−２，５ｗｔ％Ｂ−
４，５ｗＬ％Ｓｉ、残部Ｆｅ、セラミック層として、ア
ルミナ粉末を用いた。(Experiment example) Iron powder as the compact for sintering, pure iron powder as the high melting point metal layer,
As a low melting point metal layer, 1 wt% C-2,5 wt% B-
4.5 wL% Si, balance Fe, and alumina powder was used as the ceramic layer.
２プロパツール中に、エチルセルロースを２ｗｔ％加熱
溶解し、各層のコーティング用バインダーとした。これ
に、成形体と本発明である金属粉末製のカプセルの反応
を防止するためのセラミック層としてのアルミナを５Ｑ
ｖｏ１％混合し、スラリー状とした。また、各金属粉末
に対しても５Ｑｖｏ１％のスラリーを作製した。これら
のスラリー特性を向上させるためには、必要に応じて分
散剤などを添加する。スラリーはドブ漬けなどにより、
成形体にコーティングしていった。続いて、球状アルミ
ナを圧力媒体とし、５０〜１００ＭＰａの圧力でコーテ
ィングした層を軽く冷間等方向加圧成形（Ｃｏ１ｄ ｌ
５ｏｓｔａｔｉｃ Ｐｒｅｓｓｉｎｇ 、略してＣＩＰ
法と称する）する。2wt% of ethyl cellulose was heated and dissolved in 2-proper tool to form a coating binder for each layer. To this, 5Q alumina is added as a ceramic layer to prevent the reaction between the compact and the metal powder capsule of the present invention.
VO1% was mixed to form a slurry. Furthermore, a slurry of 5Qvo1% was also prepared for each metal powder. In order to improve these slurry properties, a dispersant or the like is added as necessary. The slurry is soaked in the drain, etc.
The molded body was coated. Next, using spherical alumina as a pressure medium, the coated layer was lightly cold isostatically pressed at a pressure of 50 to 100 MPa.
5ostatic pressing, abbreviated as CIP
law).
これにより、以下の工程である脱脂処理において、コー
ティングした各層の崩れ落ちを防止する。軽ＣＩＰ処理
したものを５％水素を混合したアルゴン気流中で６００
℃×１時間の脱脂処理した。そして、脱脂体を１０−３
Ｔｏｒｒ台を満足する真空中で１１５０℃まで加熱し、
そのまま、炉冷する。これにより、高融点金属層に低融
点金属が溶浸し、しかも、低融点金属は高融点金属との
反応で融点が上昇する。引き続きＨＩＰ処理により、１
００％緻密化した焼結体が得られた。ＨＩＰ条件は１０
０閘Ｐａ、１１５０℃×１時間であったが、上記のよう
に、低融点金属の融点は上昇しているために、ＨＩＰ炉
中で本カプセルが溶融することはなかった。This prevents the coated layers from collapsing during the degreasing process that follows. After light CIP treatment, it was heated to 600℃ in an argon stream mixed with 5% hydrogen.
Degreasing treatment was performed for 1 hour at ℃. Then, remove the degreased body from 10-3
Heat a Torr stand to 1150°C in a satisfactory vacuum,
Leave to cool in the oven. As a result, the low melting point metal is infiltrated into the high melting point metal layer, and the melting point of the low melting point metal increases due to the reaction with the high melting point metal. Continuing with HIP processing, 1
A sintered body with 00% densification was obtained. HIP condition is 10
The temperature was 1 hour at 1150° C. at 0 bar Pa, but as mentioned above, the melting point of the low melting point metal was elevated, so the capsule did not melt in the HIP furnace.
以上のように、本発明のカプセルにより得られるガス不
透過性膜は、成形体を真空雰囲気に保ったままで、熱間
加圧焼結を施すことが出来る。しかも、成形体を取囲ん
でいるのは多孔質の粉末カプセルであり、成形体内部に
存在する、または、加熱により発生するガスを容易に除
去（脱ガス）できる、脱ガス後は、溶浸を利用して封入
することで、封入時間は炉の昇温と降温時間だけであり
、保持時間を必要としないため、処理時間の短縮が図れ
る。また、溶浸材として、低融点金属を用いることで、
処理時間が低く、しかも、保持時間がいらないために、
成形体粉末組織の粗大化は起こらない、更に、最終的に
は低融点金属と高融点金属とが反応するために、成形体
を焼結する処理で、カプセルが再溶融することはない。As described above, the gas-impermeable membrane obtained by the capsule of the present invention can be subjected to hot pressure sintering while the molded body is kept in a vacuum atmosphere. In addition, the molded body is surrounded by a porous powder capsule, which allows for easy removal (degassing) of the gas present inside the molded body or generated by heating. By enclosing using the method, the enclosing time is only the temperature rising and cooling time of the furnace, and no holding time is required, so the processing time can be shortened. In addition, by using a low melting point metal as an infiltrant,
Because the processing time is low and no holding time is required,
The powder structure of the compact does not become coarse, and furthermore, since the low melting point metal and the high melting point metal eventually react, the capsule is not remelted during the process of sintering the compact.
［発明の効果］
上述したように、本発明のカプセル構造は焼結用成形体
に対応した・溶浸コーティング層からなるものであり、
焼結用成形体の形状に制約されず、焼結によるガス不透
過性膜とことなり、保持時間を必要としないため、処理
時間の短縮が図れる。[Effects of the Invention] As mentioned above, the capsule structure of the present invention is composed of an infiltration coating layer corresponding to a molded body for sintering,
It is not limited by the shape of the compact for sintering, and unlike gas-impermeable membranes formed by sintering, no holding time is required, so processing time can be shortened.
しかも、保持時間がいらないために、成形体粉末組織の
粗大化は起こらず、緻密な焼結体を製造することが出来
る。Furthermore, since no holding time is required, coarsening of the compact powder structure does not occur, and a dense sintered body can be produced.
第１図は本発明のカプセル構造の一実施例の断面を示す
図、第２図は本発明の他の実施例の断面を示す図である
。
１・・・焼結用成形体、２ａ、２ｂ・・・高融点金属層
、３・・・低融点金属層、４・・・溶浸コーティング層
、５・・・セラミック層。
（ｂ）
第１図
（ｂ）
第２図FIG. 1 is a cross-sectional view of one embodiment of the capsule structure of the present invention, and FIG. 2 is a cross-sectional view of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Molded body for sintering, 2a, 2b... High melting point metal layer, 3... Low melting point metal layer, 4... Infiltration coating layer, 5... Ceramic layer. (b) Figure 1 (b) Figure 2
Claims (3)
焼結温度より低い融点を持った金属系粉末及び前記焼結
温度より高い融点を持った金属系粉末のコーティング層
を溶浸により、閉気孔化してなることを特徴とする焼結
用成形体のカプセル構造。(1) A capsule of a molded body for sintering, which is infiltrated with a coating layer of a metal powder having a melting point lower than the sintering temperature of the molded body and a metal powder having a melting point higher than the sintering temperature. The capsule structure of the molded body for sintering is characterized by having closed pores.
り、低い融点を持った金属系粉末と高い融点を持った金
属系粉末をコーティングして層を形成し、これを低い融
点を持った金属系粉末の融点以上に昇温して、溶浸して
そのコーティング層を閉気孔化し、これを熱間加圧処理
したことを特徴とするカプセルによる焼結体の製造方法
。(2) A layer is formed by coating the surface of the compact for sintering with a metal powder having a melting point lower than the sintering temperature of the compact and a metal powder having a melting point higher than the sintering temperature of the compact. A method for producing a sintered body using a capsule, characterized in that the temperature is raised to a temperature higher than the melting point of a metal powder having a melting point, the coating layer is infiltrated to close the pores, and the coating layer is subjected to hot pressure treatment.
層を設けたことを特徴とする請求項１記載の焼結用成形
体のカプセル構造。(3) The capsule structure of a molded body for sintering according to claim 1, characterized in that a ceramic layer that does not react with the molded body is provided on the inner surface of the capsule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2210058A JPH0499104A (en) | 1990-08-07 | 1990-08-07 | Capsule structure of green compact for sintering and manufacture of sintered body with this capsule |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2210058A JPH0499104A (en) | 1990-08-07 | 1990-08-07 | Capsule structure of green compact for sintering and manufacture of sintered body with this capsule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0499104A true JPH0499104A (en) | 1992-03-31 |
Family
ID=16583120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2210058A Pending JPH0499104A (en) | 1990-08-07 | 1990-08-07 | Capsule structure of green compact for sintering and manufacture of sintered body with this capsule |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0499104A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2499669A (en) * | 2012-02-24 | 2013-08-28 | Charles Malcolm Ward-Close | A method of densifying a porous metallic body |
-
1990
- 1990-08-07 JP JP2210058A patent/JPH0499104A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2499669A (en) * | 2012-02-24 | 2013-08-28 | Charles Malcolm Ward-Close | A method of densifying a porous metallic body |
| CN104136148A (en) * | 2012-02-24 | 2014-11-05 | C·M·沃德-克洛斯 | Processing of metal or alloy objects |
| GB2499669B (en) * | 2012-02-24 | 2016-08-10 | Malcolm Ward-Close Charles | Processing of metal or alloy objects |
| CN104136148B (en) * | 2012-02-24 | 2016-08-24 | C·M·沃德-克洛斯 | The processing of metal or alloy object |
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