JP2000017304A - Production of inorganic powder sintered compact and inorganic powder sintered compact - Google Patents
Production of inorganic powder sintered compact and inorganic powder sintered compactInfo
- Publication number
- JP2000017304A JP2000017304A JP10182616A JP18261698A JP2000017304A JP 2000017304 A JP2000017304 A JP 2000017304A JP 10182616 A JP10182616 A JP 10182616A JP 18261698 A JP18261698 A JP 18261698A JP 2000017304 A JP2000017304 A JP 2000017304A
- Authority
- JP
- Japan
- Prior art keywords
- binder
- inorganic powder
- heating
- molded body
- decomposed
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は無機粉末焼結体を製
造する方法及び無機粉末焼結体に関し、特に結合材を良
好に除去することができる無機粉末焼結体の製造方法及
び無機粉末焼結体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic powder sintered body and an inorganic powder sintered body, and more particularly, to a method for producing an inorganic powder sintered body capable of removing a binder satisfactorily, and an inorganic powder sintered body. Regarding union.
【０００２】[0002]
【従来の技術】無機粉末を所定の形状に成形するには、
金型成形、熱間静水圧成形、冷間静水圧成形、ホットプ
レス、テープ成形、押出成形、鋳込成形、射出成形など
の種々の方法によって行われている。いずれの方法にお
いても、無機粉末を成形するために有機バインダーから
なる結合材を添加して混合し、この混合物を金型内に投
入して押圧、金型によって打ち抜き、金型内に流し込
み、金型内に射出する等のそれぞれの方法によって成形
体とする。そして、この成形体を加熱する脱脂を行って
結合材を分解除去し、その後、焼結することにより無機
粉末焼結体としている。2. Description of the Related Art In order to form an inorganic powder into a predetermined shape,
It is performed by various methods such as mold forming, hot isostatic pressing, cold isostatic pressing, hot pressing, tape forming, extrusion forming, casting forming, and injection forming. In any method, a binder made of an organic binder is added and mixed to form an inorganic powder, and the mixture is poured into a mold, pressed, punched out by a mold, poured into a mold, and poured into a mold. A molded article is formed by each method such as injection into a mold. Then, the formed body is degreased by heating to decompose and remove the binder, and then sintered to obtain an inorganic powder sintered body.
【０００３】この製造において、結合材の除去をするた
め、従来では特開平４−１４７９５０号公報に開示され
た方法が行われている。この方法は成形体中の結合材を
減圧下又は非酸化性雰囲気中で加熱して除去するもので
ある。In this production, a method disclosed in Japanese Patent Application Laid-Open No. 4-147950 has conventionally been used to remove the binder. In this method, the binder in the molded body is removed by heating under reduced pressure or in a non-oxidizing atmosphere.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述し
た従来の方法では、減圧下や非酸化性雰囲気内での結合
材の除去を行う加熱の際に、急激に成形体を加熱する、
すなわち加熱昇温速度が速すぎる、と成形体中の結合材
が急激に分解してガス化することにより分解ガスが成形
体内部に発生するため、成形体が膨れたり、割れる不都
合がある。このため、加熱昇温速度を遅くすると共に、
この加熱昇温速度を終始保ったままで脱脂を行って、成
形体の膨れや割れを防いでいる。このため、従来では、
成形体中の結合材の除去に多大な時間を要する問題を有
している。However, in the above-described conventional method, the molded body is rapidly heated during the heating for removing the binder under reduced pressure or in a non-oxidizing atmosphere.
That is, if the heating rate is too high, the binder in the molded body is rapidly decomposed and gasified to generate a decomposed gas inside the molded body, so that the molded body may be inflated or cracked. For this reason, while reducing the heating rate,
Degreasing is performed while maintaining the heating rate at all times to prevent swelling and cracking of the molded body. For this reason, conventionally,
There is a problem that it takes a lot of time to remove the binder from the molded body.
【０００５】本発明はこのような従来の問題点を考慮し
てなされたものであり、結合材の除去の際に成形体が膨
れや割れを生じることがなく、しかも極めて短時間で結
合材を除去することができる無機粉末焼結体の製造法及
びこの方法によって製造される無機粉末焼結体を提供す
ることを目的とする。The present invention has been made in consideration of such conventional problems, and does not cause swelling or cracking of the molded body when the binder is removed. It is an object of the present invention to provide a method for producing an inorganic powder sintered body that can be removed and an inorganic powder sintered body produced by this method.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明の無機粉末焼結体の製造方法は、無
機粉末と結合材とを混合して成形体を形成した後、成形
体から結合材を除去し、その後焼結を行って無機粉末焼
結体を製造する方法において、前記結合材の３５ｗｔ％
以上が分解除去するまでの加熱昇温速度をＶ１［℃／
Ｈ］、その後に結合材の９５ｗｔ％以上が分解除去する
までの加熱昇温速度をＶ２［℃／Ｈ］としたとき、 １．５×Ｖ１＜Ｖ２＜２５×Ｖ１ の加熱昇温速度で結合材を分解除去することを特徴とす
る。In order to achieve the above object, a method of manufacturing an inorganic powder sintered body according to the first aspect of the present invention is a method for producing a sintered body by mixing an inorganic powder and a binder to form a molded body. A method for producing an inorganic powder sintered body by removing a binder from a body and thereafter performing sintering, wherein 35% by weight of the binder is used.
The heating and heating rate until the above is decomposed and removed is V1 [° C. /
H], and then, assuming that the heating rate of heating until 95% by weight or more of the binder is decomposed and removed is V2 [° C./H], bonding is performed at a heating rate of 1.5 × V1 <V2 <25 × V1. The material is decomposed and removed.
【０００７】請求項２の発明の無機粉末焼結体は、無機
粉末と結合材とを混合して成形体を形成した後、成形体
から結合材を除去し、その後焼結を行うことにより製造
される無機粉末焼結体において、前記結合材の３５ｗｔ
％以上が分解除去するまでの加熱昇温速度をＶ１［℃／
Ｈ］、その後に結合材の９５ｗｔ％以上が分解除去する
までの加熱昇温速度をＶ２［℃／Ｈ］としたとき、 １．５×Ｖ１＜Ｖ２＜２５×Ｖ１ の加熱昇温速度で結合材を分解除去し、その後焼結する
ことによって製造されることを特徴とする。The inorganic powder sintered body according to the second aspect of the present invention is manufactured by mixing an inorganic powder and a binder to form a compact, removing the binder from the compact, and then performing sintering. 35 wt% of the binder
% Is decomposed and removed by heating at a rate of V1 [° C. /
H], and then, assuming that the heating rate of heating until 95% by weight or more of the binder is decomposed and removed is V2 [° C./H], bonding is performed at a heating rate of 1.5 × V1 <V2 <25 × V1. It is characterized by being manufactured by decomposing and removing a material and then sintering.
【０００８】これらの発明において、結合材の分解除去
の割合であるｗｔ％とは、成形体中に含まれる結合材の
総重量を１００ｗｔ％とするものである。[0008] In these inventions, the term "wt%", which is the ratio of decomposition and removal of the binder, means that the total weight of the binder contained in the molded article is 100 wt%.
【０００９】成形体中の結合材を除去する初期は結合材
が成形体中に多く含まれているため、加熱昇温速度Ｖ１
［℃／Ｈ］を遅くする。これにより、結合材の急激な分
解によるガス化を防ぎ、成形体の膨れや割れの発生を防
止する。この初期の加熱昇温速度では結合材の３５ｗｔ
％以上まで除去する。除去率が３５％未満では、その後
に行われる速い速度での加熱昇温の際に、成形体の膨れ
や割れの発生につながるので好ましくない。結合材が３
５ｗｔ％除去された成形体は、結合材が除去された部分
が間隙となっており、微細な空孔が空いているいわゆる
スポンジ状となっている。In the initial stage of removing the binder from the compact, since the binder contains a large amount of binder, the heating rate V1
Decrease [° C / H]. This prevents gasification due to rapid decomposition of the binder and prevents swelling and cracking of the molded body. At this initial heating rate, 35 wt.
%. If the removal rate is less than 35%, it is not preferable because swelling or cracking of the molded body occurs during the subsequent heating at a high rate of heating. 3 binders
The molded body from which 5 wt% has been removed has a so-called sponge shape in which a portion where the binder is removed is a gap and fine pores are formed.
【００１０】この遅い昇温速度での加熱の後、速い加熱
昇温速度Ｖ２［℃／Ｈ］で加熱する。このとき、結合材
の分解によって発生するガスは成形体の内部から微細な
空孔を伝って排出されるので、成形体が膨れたり、割れ
たりすることはない。この加熱昇温速度Ｖ２での結合材
の除去はその９５ｗｔ％以上が除去されるまで行うもの
である。９５％未満では残留炭素が多すぎて、その後に
行われる焼結の際に焼結体が溶融することにつながるの
で好ましくない。After the heating at the slow heating rate, heating is performed at a fast heating rate V2 [° C./H]. At this time, the gas generated by the decomposition of the binder is discharged from the inside of the molded body through the fine holes, so that the molded body does not swell or break. The removal of the binder at the heating and heating rate V2 is performed until 95% by weight or more of the binder is removed. If it is less than 95%, the amount of residual carbon is too large, and it is not preferable because the sintered body is melted in the subsequent sintering.
【００１１】本発明において、以上の加熱昇温速度Ｖ１
及びＶ２の関係は、 １．５×Ｖ１＜Ｖ２＜２５×Ｖ１ に設定するものである。これにより成形体中の結合材を
除去する時間を大幅に短縮することが可能となる。In the present invention, the above heating and heating rate V1
And V2 is set to 1.5 × V1 <V2 <25 × V1. As a result, the time for removing the binder from the molded body can be significantly reduced.
【００１２】なお、本発明における無機粉末としては、
Ｆｅ−５ｗｔ％Ｎｉ粉末、Ｆｅ−５ｗｔ％Ｃｏ粉末など
の金属粉末、ＪＩＳ規格ＳＵＳ３１６Ｌ粉末、ＳＵＳ６
３０粉末などのステンレス粉末、アルミナ（Ａｌ
2 Ｏ3 ）粉末、ジルコニア（ＺｒＯ 2 ）粉末などのセラ
ミックス粉末或いは炭化タングステン（ＷＣ）粉末など
の超硬粉末、その他の焼結することが可能な無機粉末を
使用することができる。Incidentally, the inorganic powder in the present invention includes:
Fe-5wt% Ni powder, Fe-5wt% Co powder, etc.
Metal powder, JIS standard SUS316L powder, SUS6
Powder such as stainless steel powder, alumina (Al
TwoOThree) Powder, zirconia (ZrO Two) Sera as powder
Mix powder or tungsten carbide (WC) powder, etc.
Carbide powder and other inorganic powders that can be sintered
Can be used.
【００１３】また、加熱昇温速度としては、１．５×Ｖ
１＜Ｖ２＜２５×Ｖ１としているが、１．５×Ｖ１＜Ｖ
２＜２２×Ｖ１であっても良く、１．８×Ｖ１＜Ｖ２＜
２０×Ｖ１であっても良い。より良好な加熱昇温速度と
しては、１．９×Ｖ１＜Ｖ２＜１８×Ｖ１が良く、さら
に良好な加熱昇温速度としては、２×Ｖ１＜Ｖ２＜１６
×Ｖ１が良い。The heating rate is 1.5 × V
1 <V2 <25 × V1, but 1.5 × V1 <V
2 <22 × V1 and may be 1.8 × V1 <V2 <
It may be 20 × V1. 1.9 × V1 <V2 <18 × V1 is better as a better heating rate, and 2 × V1 <V2 <16 is better as a heating rate.
× V1 is good.
【００１４】[0014]
【発明の実施の形態】（実施の形態１）図１はこの実施
の形態によって成形される成形体１を示し、この成形体
１から結合材を除去した後、焼結することにより無機粉
末焼結体を製造する。この成形体１は中央部分に切り欠
き部３を有したコ字形の本体部２を有している。本体部
２の高さａは４５ｍｍ、幅ｂは３５ｍｍ、長さｃは６０
ｍｍであり、中央部分の切欠き部３は長さｄが２０ｍ
ｍ、深さｅが２２ｍｍとなっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG. 1 shows a compact 1 formed according to the present embodiment. Manufacture the union. The molded body 1 has a U-shaped main body 2 having a cutout 3 at the center. The height a of the main body 2 is 45 mm, the width b is 35 mm, and the length c is 60.
mm, and the notch 3 at the center has a length d of 20 m.
m and depth e are 22 mm.
【００１５】次に、この実施の形態による製造方法を説
明する。無機粉末として平均粒径１２μｍのオーステナ
イト系ステンレス粉末（ＪＩＳ規格ＳＵＳ３１６Ｌ）を
９１．２ｗｔ％、結合材としてポリスチレン（ＰＳ）
２．８ｗｔ％、ポリメチルメタクリレート（ＰＭＭＡ）
２．６ｗｔ％、エチレン−ビニル酢酸共重合体（ＥＶ
Ａ）２．５ｗｔ％、パラフィンワックス０．９ｗｔ％を
混合して混練し、この混合物を射出成形によって図１に
示す形状の成形体１を成形した。Next, a manufacturing method according to this embodiment will be described. 91.2 wt% of an austenitic stainless steel powder (JIS standard SUS316L) having an average particle diameter of 12 μm as an inorganic powder, and polystyrene (PS) as a binder
2.8 wt%, polymethyl methacrylate (PMMA)
2.6 wt% of an ethylene-vinyl acetic acid copolymer (EV
A) 2.5 wt% and 0.9 wt% of paraffin wax were mixed and kneaded, and this mixture was molded into a molded article 1 having the shape shown in FIG. 1 by injection molding.
【００１６】この成形の後、成形体１を脱脂炉に移送
し、常圧下での大気雰囲気中で２２０℃まで４０℃／Ｈ
の加熱昇温速度で加熱した。２２０℃までの加熱で成形
体１中の結合材は４１ｗｔ％が分解除去された。その
後、３８５℃まで８２℃／Ｈの加熱昇温速度で加熱し、
３８５℃で５時間保持した。これにより、結合材を９
８．５ｗｔ％まで除去し、脱脂を完了した。After this molding, the molded body 1 is transferred to a degreasing furnace, and is heated to 220 ° C. and 40 ° C./H under an atmospheric pressure under normal pressure.
The heating was performed at a heating rate of. By heating to 220 ° C., 41 wt% of the binder in the molded body 1 was decomposed and removed. Then, heating to 385 ° C at a heating rate of 82 ° C / H,
It was kept at 385 ° C. for 5 hours. As a result, 9
It was removed to 8.5 wt%, and the degreasing was completed.
【００１７】その後、結合材を除去した脱脂体を焼結炉
に移送し、昇温速度３００℃／Ｈ、最高保持温度１３５
０℃、最高保持温度の保持時間２時間の条件で焼結を行
い、最終的な無機粉末焼結体としてのステンレス粉末焼
結体を得た。Thereafter, the degreased body from which the binder has been removed is transferred to a sintering furnace, where the temperature is raised at a rate of 300 ° C./H and the maximum holding temperature is 135.
Sintering was performed under the conditions of 0 ° C. and a holding time of 2 hours at the maximum holding temperature to obtain a final sintered stainless powder as an inorganic powder sintered body.
【００１８】以上の製造では、成形体１中の結合材の除
去に際し、２２０℃までは加熱昇温速度を４０℃／Ｈと
しているため、結合材は徐々に分解され、成形体内部で
の急激なガス化による膨れや割れは発生しない。また、
２２０℃までの加熱によって成形体１中の結合材が４１
ｗｔ％除去されることにより、成形体には結合材が除去
された部分の微細な空孔が多数空いている。In the above-described production, when the binder is removed from the molded body 1, the heating rate is set to 40 ° C./H up to 220 ° C., so that the binder is gradually decomposed and rapidly abruptly formed inside the molded body. No swelling or cracking due to excessive gasification occurs. Also,
By heating to 220 ° C., the binder in the molded body 1 becomes 41%.
Due to the removal of the wt%, the compact has many fine holes in the portion where the binder is removed.
【００１９】その後、加熱昇温速度を８２℃／Ｈと速く
しても、結合材の分解ガスは空孔から排出されるため、
成形体が膨れたり割れたりすることはない。従って、膨
れや割れのない良好な脱脂体を得ることができた。ま
た、２２０℃からは加熱昇温速度を速めるため、従来の
ように加熱昇温速度を４０℃／Ｈなどの遅い速度に終始
一定に保っている場合に比べ、結合材の除去に要する時
間も約２時間程度、短縮することができた。Thereafter, even if the heating rate is increased to 82 ° C./H, the decomposition gas of the binder is discharged from the pores.
The molded body does not swell or crack. Therefore, a good degreased body without swelling or cracking could be obtained. In addition, since the heating rate is increased from 220 ° C., the time required for removing the binder is longer than in the conventional case where the heating rate is kept constant at a low rate such as 40 ° C./H. The time was reduced by about 2 hours.
【００２０】（実施の形態２）図２はこの実施の形態で
成形される成形体１１を示し、矩形体からなる本体部１
２の中央部分に段状に高くなった突起部１３を有したＴ
字形となっている。本体部１２の長さｇは８０ｍｍ、高
さｈは３０ｍｍ、幅ｉは３０ｍｍであり、突起部１３は
高さｊが２５ｍｍ、長さｋが４５ｍｍとなっている。(Embodiment 2) FIG. 2 shows a molded body 11 formed in this embodiment, and a main body 1 made of a rectangular body.
2 having a stepped raised projection 13 at the center of
It is shaped like a letter. The length g of the main body 12 is 80 mm, the height h is 30 mm, the width i is 30 mm, and the height 13 of the projection 13 is 25 mm and the length k is 45 mm.
【００２１】この成形体１１としては、無機粉末として
平均粒径８μｍのフェライト系ステンレス粉末（ＪＩＳ
規格ＳＵＳ４３０粉末）９２．０ｗｔ％、結合材として
ポリプロピレン（ＰＰ）４．５ｗｔ％、ポリエチレン
（ＰＥ）３．２ｗｔ％、カルナウバワックス０．３ｗｔ
％を用い、これらを混合して混練した後、射出成形する
ことにより成形する。The molded body 11 is made of a ferritic stainless steel powder (JIS) having an average particle size of 8 μm as an inorganic powder.
Standard SUS430 powder) 92.0 wt%, binder (polypropylene (PP) 4.5 wt%, polyethylene (PE) 3.2 wt%, carnauba wax 0.3 wt
%, These are mixed and kneaded, and then molded by injection molding.
【００２２】この成形の後、成形体１１を脱脂炉に移送
し、常圧下での大気雰囲気中で２５０℃まで８℃／Ｈの
加熱昇温速度で加熱した。２５０℃までの加熱で成形体
１１中の結合材は４５ｗｔ％が分解除去された。その
後、３６５℃まで１２０℃／Ｈの加熱昇温速度で加熱
し、３６５℃で５時間保持した。これにより、結合材を
９８．８ｗｔ％まで除去し、脱脂を完了した。After this molding, the molded body 11 was transferred to a degreasing furnace and heated to 250 ° C. at a heating rate of 8 ° C./H under atmospheric pressure at normal pressure. By heating to 250 ° C., 45 wt% of the binder in the molded body 11 was decomposed and removed. Thereafter, the mixture was heated to 365 ° C. at a heating rate of 120 ° C./H, and kept at 365 ° C. for 5 hours. Thus, the binder was removed up to 98.8 wt%, and the degreasing was completed.
【００２３】その後、結合材を除去した脱脂体を焼結炉
に移送し、昇温速度２５０℃／Ｈ、最高保持温度１３２
０℃、最高保持温度の保持時間１時間の条件で焼結を行
い、最終的な無機粉末焼結体としてのステンレス粉末焼
結体を得た。Thereafter, the degreased body from which the binder has been removed is transferred to a sintering furnace, where the temperature is raised at a rate of 250 ° C./H and the maximum holding temperature is 132.
Sintering was performed under the conditions of 0 ° C. and a holding time of 1 hour at the maximum holding temperature to obtain a final sintered stainless powder as an inorganic powder sintered body.
【００２４】以上の製造では、成形体１１中の結合材の
除去に際し、２５０℃までは加熱昇温速度を８℃／Ｈと
しているため、結合材は徐々に分解され、成形体内部で
の急激なガス化による膨れや割れは発生しない。また、
２５０℃までの加熱によって成形体１１中の結合材が４
５ｗｔ％除去されることにより、成形体には結合材が除
去された部分の微細な空孔が多数空いている。In the above-mentioned production, when the binder is removed from the molded body 11, the heating rate is set to 8 ° C./H up to 250 ° C., so that the binder is gradually decomposed and rapidly decomposed inside the molded body. No swelling or cracking due to excessive gasification occurs. Also,
By heating to 250 ° C., the binder in the molded body 11 becomes 4
As a result of the removal of 5 wt%, the compact has many fine holes in the portion where the binder has been removed.
【００２５】その後、加熱昇温速度を１２０℃／Ｈと速
くしても、結合材の分解ガスは空孔から排出されるた
め、成形体が膨れたり割れたりすることはない。従っ
て、膨れや割れのない良好な脱脂体を得ることができ
た。また、２５０℃からは加熱昇温速度を速めるため、
従来のように加熱昇温速度を８℃／Ｈなどの遅い速度に
終始一定に保っている場合に比べ、結合材の除去に要す
る時間も約１３時間程度、短縮することができた。Thereafter, even if the heating rate is increased to 120 ° C./H, since the decomposition gas of the binder is discharged from the pores, the molded body does not swell or crack. Therefore, a good degreased body without swelling or cracking could be obtained. Also, from 250 ° C, to increase the heating rate,
The time required for removing the binder can be reduced by about 13 hours as compared with the conventional case where the heating rate is kept constant at a low rate such as 8 ° C./H.
【００２６】（実施の形態３）この実施の形態では、図
２に示す成形体１１を成形し、この成形体を脱脂した
後、焼結することにより焼結体とした。Embodiment 3 In this embodiment, a compact 11 shown in FIG. 2 was formed, the compact was degreased, and then sintered to obtain a sintered compact.
【００２７】この実施の形態では、無機粉末として平均
粒径８．５μｍのマルテンサイト系ステンレス（ＪＩＳ
規格ＳＵＳ４４０Ｃ）粉末９１．５ｗｔ％と、結合材と
してポリアミド（ＰＡ）８．５ｗｔ％とを混合して混練
し、射出成形することにより成形体１１とした。In this embodiment, a martensitic stainless steel having an average particle size of 8.5 μm (JIS) is used as the inorganic powder.
91.5 wt% of standard SUS440C powder and 8.5 wt% of polyamide (PA) as a binder were mixed, kneaded, and injection molded to obtain a molded body 11.
【００２８】この成形の後、成形体１１を脱脂炉に移送
し、１０-4ｔｏｒｒの真空雰囲気下で、２００℃まで１
２℃／Ｈの加熱昇温速度で加熱した。２００℃までの加
熱で成形体１１中の結合材は３７ｗｔ％が分解除去され
た。その後、３５５℃まで１３５℃／Ｈの加熱昇温速度
で加熱し、３５５℃で５時間保持した。これにより、結
合材を９７．５ｗｔ％まで除去し、脱脂を完了した。After this molding, the molded body 11 is transferred to a degreasing furnace, and heated to 200 ° C. under a vacuum atmosphere of 10 -4 torr.
Heating was performed at a heating rate of 2 ° C./H. By heating to 200 ° C., 37 wt% of the binder in the molded body 11 was decomposed and removed. Thereafter, the mixture was heated to 355 ° C. at a heating rate of 135 ° C./H, and kept at 355 ° C. for 5 hours. As a result, the binder was removed to 97.5 wt%, and the degreasing was completed.
【００２９】その後、結合材を除去した脱脂体を焼結炉
に移送し、昇温速度３００℃／Ｈ、最高保持温度１２４
０℃、最高保持温度の保持時間１時間の条件で焼結を行
い、最終的な無機粉末焼結体としてのステンレス粉末焼
結体を得た。Thereafter, the degreased body from which the binder has been removed is transferred to a sintering furnace, where the temperature is raised at a rate of 300 ° C./H and the maximum holding temperature is 124.
Sintering was performed under the conditions of 0 ° C. and a holding time of 1 hour at the maximum holding temperature to obtain a final sintered stainless powder as an inorganic powder sintered body.
【００３０】以上の製造では、成形体１１中の結合材の
除去に際し、２００℃までは加熱昇温速度を１２℃／Ｈ
としているため、結合材は徐々に分解され、成形体内部
での急激なガス化による膨れや割れは発生しない。ま
た、２００℃までの加熱によって成形体１１中の結合材
が３７ｗｔ％除去されることにより、成形体には結合材
が除去された部分の微細な空孔が多数空いている。In the above production, when the binder in the molded body 11 is removed, the heating rate is set to 12 ° C./H up to 200 ° C.
Therefore, the binder is gradually decomposed, and no swelling or cracking occurs due to rapid gasification inside the molded body. In addition, since the binder in the molded body 11 is removed by 37 wt% by heating to 200 ° C., the molded body has many fine holes in the portion where the binder is removed.
【００３１】その後、加熱昇温速度を１３５℃／Ｈと速
くしても、結合材の分解ガスは空孔から排出されるた
め、成形体が膨れたり割れたりすることはない。従っ
て、膨れや割れのない良好な脱脂体を得ることができ
た。また、２００℃からは加熱昇温速度を速めるため、
従来のように加熱昇温速度を１２℃／Ｈなどの遅い速度
に終始一定に保っている場合に比べ、結合材の除去に要
する時間も約１２時間程度、短縮することができた。After that, even if the heating rate is increased to 135 ° C./H, the decomposed gas of the binder is discharged from the pores, so that the compact does not swell or crack. Therefore, a good degreased body without swelling or cracking could be obtained. Also, from 200 ° C, to increase the heating rate,
The time required for removing the binder can be reduced by about 12 hours as compared with the conventional case where the heating rate is kept constant at a low rate such as 12 ° C./H.
【００３２】なお、以上の実施の形態では、成形体の成
形方法として射出成形を用いたが、これにとらわれるこ
となく、金型成形、熱間静水圧成形、冷間静水圧成形、
ホットプレス、テープ成形、押出成形、鋳込成形等を用
いても良い。In the above-described embodiment, injection molding is used as a molding method of a molded body. However, the present invention is not limited to this, and it is possible to use mold molding, hot isostatic pressing, cold isostatic pressing, or the like.
Hot pressing, tape molding, extrusion molding, cast molding, or the like may be used.
【００３３】[0033]
【発明の効果】以上説明したように、請求項１の発明に
よれば、成形体から結合材を除去するのに際し、膨れや
割れが発生することがないと共に、短い時間で迅速に結
合材を除去することができる。As described above, according to the first aspect of the present invention, when the binder is removed from the molded body, no swelling or cracking occurs, and the binder is quickly removed in a short time. Can be removed.
【００３４】請求項２の発明によれば、短い時間で確実
に結合材が除去された無機粉末焼結体とすることができ
る。According to the second aspect of the present invention, it is possible to obtain an inorganic powder sintered body from which the binder is reliably removed in a short time.
【図１】本発明の実施の形態１によって成形された成形
体の斜視図である。FIG. 1 is a perspective view of a molded article formed according to Embodiment 1 of the present invention.
【図２】本発明の実施の形態２及び３によって成形され
た成形体の斜視図である。FIG. 2 is a perspective view of a molded body molded according to Embodiments 2 and 3 of the present invention.
フロントページの続き (72)発明者 山口 博史 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 (72)発明者 山本 昇司 東京都渋谷区幡ヶ谷２丁目43番２号 オリ ンパス光学工業株式会社内 Ｆターム(参考） 4K018 BA20 DA03 DA22 Continued on the front page (72) Inventor Hiroshi Yamaguchi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. (72) Inventor Shoji Yamamoto 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industrial Co., Ltd. F term (reference) 4K018 BA20 DA03 DA22
Claims (2)
形成した後、成形体から結合材を除去し、その後焼結を
行って無機粉末焼結体を製造する方法において、 前記結合材の３５ｗｔ％以上が分解除去するまでの加熱
昇温速度をＶ１［℃／Ｈ］、その後に結合材の９５ｗｔ
％以上が分解除去するまでの加熱昇温速度をＶ２［℃／
Ｈ］としたとき、 １．５×Ｖ１＜Ｖ２＜２５×Ｖ１ の加熱昇温速度で結合材を分解除去することを特徴とす
る無機粉末焼結体の製造方法。1. A method for producing a sintered inorganic powder by mixing an inorganic powder and a binder to form a molded body, removing the binder from the molded body, and thereafter performing sintering to produce the inorganic powder sintered body. V1 [° C / H] until 35% by weight or more of the material is decomposed and removed, and then 95% of the binder
% Is decomposed and removed, the heating rate is V2 [° C /
H], wherein the binder is decomposed and removed at a heating rate of 1.5 × V1 <V2 <25 × V1.
形成した後、成形体から結合材を除去し、その後焼結を
行うことにより製造される無機粉末焼結体において、 前記結合材の３５ｗｔ％以上が分解除去するまでの加熱
昇温速度をＶ１［℃／Ｈ］、その後に結合材の９５ｗｔ
％以上が分解除去するまでの加熱昇温速度をＶ２［℃／
Ｈ］としたとき、 １．５×Ｖ１＜Ｖ２＜２５×Ｖ１ の加熱昇温速度で結合材を分解除去し、その後焼結する
ことによって製造されることを特徴とする無機粉末焼結
体。2. An inorganic powder sintered body manufactured by mixing an inorganic powder and a binder to form a molded body, removing the binder from the molded body, and thereafter performing sintering. V1 [° C / H] until 35% by weight or more of the material is decomposed and removed, and then 95% of the binder
% Is decomposed and removed, the heating rate is V2 [° C /
H], wherein the binder is decomposed and removed at a heating rate of 1.5 × V1 <V2 <25 × V1 and then sintered to produce an inorganic powder sintered body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10182616A JP2000017304A (en) | 1998-06-29 | 1998-06-29 | Production of inorganic powder sintered compact and inorganic powder sintered compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10182616A JP2000017304A (en) | 1998-06-29 | 1998-06-29 | Production of inorganic powder sintered compact and inorganic powder sintered compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000017304A true JP2000017304A (en) | 2000-01-18 |
Family
ID=16121412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10182616A Pending JP2000017304A (en) | 1998-06-29 | 1998-06-29 | Production of inorganic powder sintered compact and inorganic powder sintered compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000017304A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012062221A (en) * | 2010-09-16 | 2012-03-29 | Tdk Corp | Method for producing sintered compact |
| JP2013524006A (en) * | 2010-04-01 | 2013-06-17 | テヒニーシェ ウニヴェルジテート ウィーン | Method for producing molded product of aluminum alloy |
-
1998
- 1998-06-29 JP JP10182616A patent/JP2000017304A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013524006A (en) * | 2010-04-01 | 2013-06-17 | テヒニーシェ ウニヴェルジテート ウィーン | Method for producing molded product of aluminum alloy |
| JP2012062221A (en) * | 2010-09-16 | 2012-03-29 | Tdk Corp | Method for producing sintered compact |
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