JPH04180503A - Method for degreasing powder injection molding body - Google Patents
Method for degreasing powder injection molding bodyInfo
- Publication number
- JPH04180503A JPH04180503A JP2307145A JP30714590A JPH04180503A JP H04180503 A JPH04180503 A JP H04180503A JP 2307145 A JP2307145 A JP 2307145A JP 30714590 A JP30714590 A JP 30714590A JP H04180503 A JPH04180503 A JP H04180503A
- Authority
- JP
- Japan
- Prior art keywords
- degreasing
- powder injection
- injection molded
- binder
- electron beam
- 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
- 238000005238 degreasing Methods 0.000 title claims abstract description 63
- 239000000843 powder Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001746 injection moulding Methods 0.000 title claims abstract description 12
- 238000010894 electron beam technology Methods 0.000 claims abstract description 24
- 239000011230 binding agent Substances 0.000 claims abstract description 22
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 40
- 239000007924 injection Substances 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 10
- 238000004898 kneading Methods 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 6
- 239000001569 carbon dioxide Substances 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 5
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- WQMWHMMJVJNCAL-UHFFFAOYSA-N 2,4-dimethylpenta-1,4-dien-3-one Chemical compound CC(=C)C(=O)C(C)=C WQMWHMMJVJNCAL-UHFFFAOYSA-N 0.000 description 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 229920002319 Poly(methyl acrylate) Polymers 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は粉末射出成形体の脱脂方法にかかわ゛るもので
、とくに超臨界ガスあるいは流化液体などを用いて脱脂
を行うようにした粉末射出成形体の脱脂方法に関するも
のである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for degreasing powder injection molded articles, and particularly relates to a method for degreasing powder injection molded articles, and in particular, a method for degreasing powder injection molded articles using supercritical gas or fluidizing liquid. The present invention relates to a method for degreasing an injection molded article.
［従来の技術］
近年、プラスチックの射出成形の技術がセラミックス粉
末や金属粉末の射出成形へと発展し、各種の分野にわた
る部品がセラミックス粉末や金属粉末の射出成形により
製作されている。[Prior Art] In recent years, plastic injection molding technology has developed into injection molding of ceramic powders and metal powders, and parts in various fields are manufactured by injection molding of ceramic powders and metal powders.
こうした粉末射出成形においては、金属等の微粒子から
なる粉末を有機材料（ワックス、ポリエチレンなどの樹
脂）などの結合剤（バインダー）とともに加熱混練して
混練体を得る。この混練体をプラスチックの場合と同様
に射出成形機を用いて所定の型に射出成形し、グリーン
体と呼ばれる圧着した粉末射出成形体を得る。In such powder injection molding, a powder made of fine particles of metal or the like is heated and kneaded with a binder such as an organic material (wax, resin such as polyethylene) to obtain a kneaded body. This kneaded body is injection molded into a predetermined mold using an injection molding machine in the same manner as in the case of plastics, to obtain a pressed powder injection molded body called a green body.
このグリーン体にはバインダーが含まれているので、加
熱によりこのバインダーを抜き出す必要がある。この加
熱工程によりバインダーを抜き出すこと（脱バインダー
）を脱脂と称している。Since this green body contains a binder, it is necessary to extract this binder by heating. The process of removing the binder (removal of the binder) through this heating process is called degreasing.
脱脂後の粉末射出成形体である脱脂体を焼成あるいは焼
結して圧縮し、バインダーの抜けた後の無数の空間を埋
めて、相似形の縮小した焼結体となった最終製品を得る
。The degreased body, which is a powder injection molded body after degreasing, is fired or sintered and compressed to fill the countless spaces left after the binder has been removed, to obtain a final product that is a sintered body with a similar shape and reduced size.
従来から、ファインセラミックス粉末等に使用する上記
バインダーとしては、熱可塑性樹脂などの高分子系材料
や、高級アルコール、高級脂肪酸、ワックスなどの低分
子系材料を組み合わせて用いている。Conventionally, the binder used in fine ceramic powders and the like has been used in combination with polymer materials such as thermoplastic resins, and low molecular materials such as higher alcohols, higher fatty acids, and waxes.
また従来、バインダーとして高分子系材料を使用した粉
末射出成形体の脱脂には、非常に長い時間が必要な加熱
脱脂しか用いることができなかった。Furthermore, in the past, only heat degreasing, which requires a very long time, could be used to degrease powder injection molded bodies using a polymeric material as a binder.
一方、上記脱脂工程における溶媒として、超臨界状態の
二酸化炭素やフロンを使用する超臨界脱脂、あるいは液
化流体を使用する脱脂では、短時間での脱脂が可能であ
り、材料粉末ないしはバインダーの種類に応じて用いら
れている。On the other hand, supercritical degreasing, which uses supercritical carbon dioxide or fluorocarbons as a solvent in the degreasing process, or degreasing, which uses liquefied fluid, enables degreasing in a short time, and depends on the type of material powder or binder. It is used accordingly.
しかしながら、こうした超臨界脱脂などにおいては高分
子系材料を抽出することができないために低分子系材料
の割合が多いバインダーを使用している。However, in such supercritical degreasing, it is not possible to extract high molecular weight materials, so a binder containing a large proportion of low molecular weight materials is used.
ところが、粉末射出成形等で複雑形状の粉末射出成形体
を成形する場合に、低分子材料の割合が多いバインダー
を使用すると、成形性が悪いために成形が困難であると
いう問題がある。However, when molding a complex-shaped powder injection molded product by powder injection molding or the like, if a binder containing a large proportion of low-molecular material is used, there is a problem that molding is difficult due to poor moldability.
［発明が解決しようとする課題］
本発明は以上のような諸問題にかんがみてなされたもの
で、短時間脱脂が可能な超臨界脱脂等を使用可能とする
ことができるとともに、成形性が良好な粉末射出成形体
の脱脂方法を提供することを課題とする。[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problems, and allows the use of supercritical degreasing, etc., which can perform degreasing in a short time, and has good moldability. An object of the present invention is to provide a method for degreasing a powder injection molded body.
［課題を解決するための手段］
すなわち本発明は、セラミックス粉末や金属粉末などの
材料粉体にバインダーを混練することにより混練体とし
、この混練体を射出成形することにより粉末射出成形体
とし、さらにこの粉末射出成形体の脱脂を行う粉末射出
成形体の脱脂方法であって、上記バインダーとして、電
子線あるいは電磁波に対して崩壊型のポリマーを使用し
て上記粉末射出成形体を成形する射出成形工程と、この
粉末射出成形体に電子線あるいは電磁波を照射する照射
工程と、この電子線あるいは電磁波照射後の該粉末射出
成形体の脱脂を行う脱脂工程とを′有することを特徴と
する粉末射出成形体の脱脂方法である。[Means for Solving the Problems] That is, the present invention provides a kneaded body by kneading a binder into material powder such as ceramic powder or metal powder, and a powder injection molded body by injection molding this kneaded body. Furthermore, there is provided a method for degreasing a powder injection molded article, wherein the powder injection molded article is molded using a polymer that disintegrates against electron beams or electromagnetic waves as the binder. an irradiation step of irradiating the powder injection molded product with an electron beam or electromagnetic waves; and a degreasing step of degreasing the powder injection molded product after irradiation with the electron beam or electromagnetic waves. This is a method for degreasing a molded object.
なお上記脱脂工程としては、通常の加熱によるもの、超
臨界ガスを用いるもの、あるいは液化流体を用いるもの
などを採用することができる。Note that the degreasing process may be performed using ordinary heating, using supercritical gas, or using liquefied fluid.
第１図に、とくに電子線照射および超臨界脱脂の場合に
ついて、本発明による脱脂方法の概略工程を示す。FIG. 1 schematically shows the steps of the degreasing method according to the present invention, particularly in the case of electron beam irradiation and supercritical degreasing.
本発明においては、電子線照射あるいはＸ線やガンマ線
などの電磁波照射により分解する高分子ポリマーをバイ
ンダーに使用して粉末射出成形体を作成する。この粉末
射出成形体に電子線あるいは電磁波を照射してそのポリ
マーをより低分子のオリゴマーに分解したのち、加熱処
理により、超臨界炭酸ガスもしくはフロン等の超臨界ガ
スあるいは液化流体を用いて、これら低分子化したバイ
ンダーを抽出除去（脱ｎ＞するものである。In the present invention, a powder injection molded article is produced using a polymer that is decomposed by electron beam irradiation or electromagnetic wave irradiation such as X-rays or gamma rays as a binder. This powder injection molded product is irradiated with electron beams or electromagnetic waves to decompose the polymer into lower molecular oligomers, and then heat-treated to produce these components using a supercritical gas such as supercritical carbon dioxide or chlorofluorocarbons, or a liquefied fluid. This method extracts and removes the binder that has become low in molecular weight.
この超臨界脱脂ののち、通常の焼成工程を経て製品とす
るものである。After this supercritical degreasing, the product is made into a product through a normal firing process.
なお一般に、高分子ポリマーに電子線あるいは電磁波を
照射させると、そのポリマーの性質により、橋かけ型（
ネガ型）と崩壊型（ポジ型）とに分類される。In general, when a polymer is irradiated with an electron beam or electromagnetic waves, cross-linking (
It is classified into two types: negative type) and decay type (positive type).
横かけ型ポリマーは、たちえば電子線照射により炭素鎖
が連結重合して行くもので、ポリエチレン、ポリメチレ
ン、ポリプロピレン、ポリスチレン、ポリアクリル酸、
ポリメチルアクリラート、ポリアクリルアミド、ポリビ
ニルアルキルエーテル、ポリビニルメチルケトンなどが
ある。Horizontal polymers are those in which carbon chains are linked and polymerized by electron beam irradiation, such as polyethylene, polymethylene, polypropylene, polystyrene, polyacrylic acid,
Examples include polymethyl acrylate, polyacrylamide, polyvinyl alkyl ether, and polyvinyl methyl ketone.
崩壊型ポリマーは、たとえば電子線照射により炭素鎖が
切れて低分子に分解して行くもので、ポリイソブチレン
、ポリ−α−メチルスチレン、ポリメタクリル酸、ポリ
メチルメタクリラート、ポリメタクリルアミド、ポリメ
チルイソプロペニルケトン、ふっ素系樹脂などがある。For example, collapsible polymers are those whose carbon chains are broken by electron beam irradiation and decomposed into low molecules, such as polyisobutylene, poly-α-methylstyrene, polymethacrylic acid, polymethylmethacrylate, polymethacrylamide, and polymethyl. Examples include isopropenyl ketone and fluorine resins.
なお、崩壊型ポリマーと橋かけ型ポリマーとを適宜組み
合わせることにより、所望の脱脂率の脱脂体を得ること
ができる。In addition, by appropriately combining a collapsible polymer and a crosslinked polymer, a degreased body having a desired degreasing rate can be obtained.
［作用コ
本発明による脱脂方法において、バインダーとして崩壊
型のポリマーを選択するとともに、超臨界脱脂法などに
よる脱脂の前工程に電子線あるいは電磁波照射工程を加
えることにより、電子線あるいは電磁波の作用でポリマ
ーをオリゴマーとし、超臨界炭酸ガスやフロン等により
抽出可能な状態とする。[Function] In the degreasing method according to the present invention, a collapsible polymer is selected as the binder, and an electron beam or electromagnetic wave irradiation step is added to the degreasing process by supercritical degreasing, etc. The polymer is made into an oligomer and made into a state that can be extracted using supercritical carbon dioxide, fluorocarbons, etc.
つまり従来、ポリマーに対して抽出不可能な溶媒である
超臨界あるいは液化状態の二酸化炭素やフロン等を用い
て脱脂を行うことができる。That is, conventionally, degreasing can be performed using supercritical or liquefied carbon dioxide, fluorocarbon, etc., which are solvents that cannot be extracted from polymers.
［実施例］ つぎに本発明の詳細な説明する。[Example] Next, the present invention will be explained in detail.
（実施例１）
セラミックス粉末としてアルミナ粉末を用いる。このア
ルミナ粉末１００重量部に、バインダー１８重量部（ポ
リメチルメタクリレート（ＰＭＭＡ）１６重量部、ステ
アリ２１１１重１部、フタル酸デイオクチル１重量部）
を混練して射出材料（混練体）を準備した。(Example 1) Alumina powder is used as the ceramic powder. To 100 parts by weight of this alumina powder, 18 parts by weight of binder (16 parts by weight of polymethyl methacrylate (PMMA), 1 part by weight of Steary 2111, 1 part by weight of dioctyl phthalate)
An injection material (kneaded body) was prepared by kneading.
この射出材料を用いて射出成形機により１０ｍ ｍ Ｘ
１０ ｍ ｍ Ｘ ２ ｍ ｍの粉末射出成形体（グ
リーン体）を作成した。Using this injection material, 10mm x
A powder injection molded body (green body) measuring 10 mm x 2 mm was prepared.
この粉末射出成形体に電子線を照射したのち（照射線量
１００Ｍｒａｄ）、操作条件として第２図に示すような
脱脂曲線（図中、実線）で加熱脱脂した。□脱脂は５０
時間でほぼ終了し、この際脱脂体は膨れ、クラック等の
欠陥は認められなかった。After this powder injection molded body was irradiated with an electron beam (irradiation dose: 100 Mrad), it was heated and degreased under the operating conditions as shown in the degreasing curve shown in FIG. 2 (solid line in the figure). □Degreasing is 50
The degreasing was completed within a few hours, and no defects such as swelling or cracks were observed in the degreased body.
比較例として、電子線照射を実施しない粉末射出成形体
を上記脱脂曲線と同条件の加熱脱脂を行ったところ、ク
ラックが発生した。As a comparative example, when a powder injection molded body that was not subjected to electron beam irradiation was subjected to heat degreasing under the same conditions as the above degreasing curve, cracks occurred.
なお、電子線照射を実施しない粉末射出成形体を欠陥の
ないように加熱脱脂する場合には、第２図の点線のよう
に８０時間が必要である。In addition, when heating and degreasing a powder injection molded body that is not subjected to electron beam irradiation so that there are no defects, 80 hours are required as shown by the dotted line in FIG.
（実施例２）
実施例１と同様にして準備した粉末射出成形体に、同様
の条件で電子線照射した。(Example 2) A powder injection molded body prepared in the same manner as in Example 1 was irradiated with an electron beam under the same conditions.
こののち、ＩＭＩＩ界ガスを用いて操作条件温度６０°
Ｃ１圧力２００Ｋｇ／ｃｍ２．５時間で脱脂したところ
、脱脂率８２％の欠陥のない脱脂体を得た。After this, the operating condition temperature is 60° using IMII field gas.
When degreased at a C1 pressure of 200 kg/cm for 2.5 hours, a defect-free degreased body with a degreasing rate of 82% was obtained.
比較例として、電子線照射を実施しない粉末射出成形体
を上記条件で脱脂を行った場合は、脱脂率は８％であっ
た。As a comparative example, when a powder injection molded body without electron beam irradiation was degreased under the above conditions, the degreasing rate was 8%.
（実施例３）
実施例１と同様にして準備した粉末射出成形体に、同様
の条件で電子線照射した。(Example 3) A powder injection molded body prepared in the same manner as in Example 1 was irradiated with an electron beam under the same conditions.
こののち、液化炭酸ガス等の液化流体を用いて操作条件
温度２ｏ℃、圧力２００Ｋｇ／Ｃｍ２．５時間で脱脂し
たところ、脱脂率７０％の欠陥のない脱脂体を得た。Thereafter, degreasing was performed using a liquefied fluid such as liquefied carbon dioxide under operating conditions of temperature 20° C. and pressure 200 Kg/Cm for 2.5 hours, to obtain a defect-free degreased body with a degreasing rate of 70%.
比較例として、電子線照射を実施しない粉末射出成形体
を上記条件で脱脂を行った場合は、脱脂率は４％であっ
た。As a comparative example, when a powder injection molded body without electron beam irradiation was degreased under the above conditions, the degreasing rate was 4%.
［発明の効果コ
以上説明したように本発明によれば、ファインセラミッ
クス粉末射出成形体等の超臨界脱脂工程などの前処理と
して電子線照射あるいは電磁波照射工程を加えたもので
あり、短時間脱脂が可能な超臨界脱脂などの長所を活か
して脱脂を行うとともに、高分子ポリマーをバインダー
として使用可能となるため成形性は良好である。[Effects of the Invention] As explained above, according to the present invention, an electron beam irradiation or electromagnetic wave irradiation process is added as a pretreatment for supercritical degreasing of fine ceramic powder injection molded bodies, etc. In addition to degreasing by taking advantage of the advantages of supercritical degreasing, which is capable of
第１図は本発明の脱脂方法を示す概略工程図、第２図は
加熱脱脂曲線のグラフである。
特許出願人 住友重機械工業株式会社
復代理人 弁理士 池澤 寛
第 １ 図FIG. 1 is a schematic process diagram showing the degreasing method of the present invention, and FIG. 2 is a graph of a heat degreasing curve. Patent applicant Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Hiroshi Ikezawa Figure 1
Claims (4)
体とし、この混練体を射出成形することにより粉末射出
成形体とし、さらにこの粉末射出成形体の脱脂を行う粉
末射出成形体の脱脂方法であって、 前記バインダーとして、電子線あるいは電磁波に対して
崩壊型のポリマーを使用して前記粉末射出成形体を成形
する射出成形工程と、 この粉末射出成形体に電子線あるいは電磁波を照射する
照射工程と、 この電子線あるいは電磁波照射後の該粉末射出成形体の
脱脂を行う脱脂工程とを有することを特徴とする粉末射
出成形体の脱脂方法。(1) A method for degreasing a powder injection molded body, which involves kneading a binder into a material powder to form a kneaded body, injection molding this kneaded body to make a powder injection molded body, and then degreasing the powder injection molded body. an injection molding step of molding the powder injection molded product using a polymer that is disintegrated by electron beams or electromagnetic waves as the binder; and an irradiation step of irradiating the powder injection molded product with electron beams or electromagnetic waves. and a degreasing step of degreasing the powder injection molded article after the electron beam or electromagnetic wave irradiation.
ことによりその脱脂を行う脱脂工程であることを特徴と
する請求項（１）記載の粉末射出成形体の脱脂方法。(2) The method for degreasing a powder injection molded article according to claim 1, wherein the degreasing step is a degreasing step in which the powder injection molded article is degreased by heating it.
出成形体の脱脂を行う脱脂工程であることを特徴とする
請求項（１）記載の粉末射出成形体の脱脂方法。(3) The method for degreasing a powder injection molded article according to claim 1, wherein the degreasing step is a degreasing step of degreasing the powder injection molded article using supercritical gas.
成形体の脱脂を行う脱脂工程であることを特徴とする請
求項（１）記載の粉末射出成形体の脱脂方法。(4) The method for degreasing a powder injection molded article according to claim 1, wherein the degreasing step is a degreasing step of degreasing the powder injection molded article using a fluidizing liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2307145A JPH04180503A (en) | 1990-11-15 | 1990-11-15 | Method for degreasing powder injection molding body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2307145A JPH04180503A (en) | 1990-11-15 | 1990-11-15 | Method for degreasing powder injection molding body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04180503A true JPH04180503A (en) | 1992-06-26 |
Family
ID=17965578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2307145A Pending JPH04180503A (en) | 1990-11-15 | 1990-11-15 | Method for degreasing powder injection molding body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04180503A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100463232B1 (en) * | 2001-10-12 | 2004-12-23 | 한국과학기술연구원 | Dewaxing method by the use of mixed solvent in mold product |
| JP2016016565A (en) * | 2014-07-07 | 2016-02-01 | 日本特殊陶業株式会社 | Compact production method, insulator for spark plug, and spark plug |
-
1990
- 1990-11-15 JP JP2307145A patent/JPH04180503A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100463232B1 (en) * | 2001-10-12 | 2004-12-23 | 한국과학기술연구원 | Dewaxing method by the use of mixed solvent in mold product |
| JP2016016565A (en) * | 2014-07-07 | 2016-02-01 | 日本特殊陶業株式会社 | Compact production method, insulator for spark plug, and spark plug |
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