JPH04165005A - Method for removing binder from powder green compact - Google Patents
Method for removing binder from powder green compactInfo
- Publication number
- JPH04165005A JPH04165005A JP2289391A JP28939190A JPH04165005A JP H04165005 A JPH04165005 A JP H04165005A JP 2289391 A JP2289391 A JP 2289391A JP 28939190 A JP28939190 A JP 28939190A JP H04165005 A JPH04165005 A JP H04165005A
- Authority
- JP
- Japan
- Prior art keywords
- binder
- eluted
- powder
- organic solvent
- organic
- 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
- 239000011230 binding agent Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 39
- BPJYAXCTOHRFDQ-UHFFFAOYSA-L tetracopper;2,4,6-trioxido-1,3,5,2,4,6-trioxatriarsinane;diacetate Chemical compound [Cu+2].[Cu+2].[Cu+2].[Cu+2].CC([O-])=O.CC([O-])=O.[O-][As]1O[As]([O-])O[As]([O-])O1.[O-][As]1O[As]([O-])O[As]([O-])O1 BPJYAXCTOHRFDQ-UHFFFAOYSA-L 0.000 title abstract 2
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000003960 organic solvent Substances 0.000 claims abstract description 29
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 238000005238 degreasing Methods 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims 1
- -1 polyethylene Polymers 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000919 ceramic Substances 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 150000002739 metals Chemical class 0.000 abstract description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229920000573 polyethylene Polymers 0.000 abstract description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000008096 xylene Substances 0.000 abstract description 2
- 238000004898 kneading Methods 0.000 abstract 2
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000010828 elution Methods 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010137 moulding (plastic) Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- XNLICIUVMPYHGG-UHFFFAOYSA-N pentan-2-one Chemical compound CCCC(C)=O XNLICIUVMPYHGG-UHFFFAOYSA-N 0.000 description 2
- FDPIMTJIUBPUKL-UHFFFAOYSA-N pentan-3-one Chemical compound CCC(=O)CC FDPIMTJIUBPUKL-UHFFFAOYSA-N 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- DFFDSQBEGQFJJU-UHFFFAOYSA-M butyl carbonate Chemical compound CCCCOC([O-])=O DFFDSQBEGQFJJU-UHFFFAOYSA-M 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- CXHHBNMLPJOKQD-UHFFFAOYSA-M methyl carbonate Chemical compound COC([O-])=O CXHHBNMLPJOKQD-UHFFFAOYSA-M 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- CQDGTJPVBWZJAZ-UHFFFAOYSA-N monoethyl carbonate Chemical compound CCOC(O)=O CQDGTJPVBWZJAZ-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- FOWDZVNRQHPXDO-UHFFFAOYSA-N propyl hydrogen carbonate Chemical compound CCCOC(O)=O FOWDZVNRQHPXDO-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 238000004904 shortening Methods 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
- 239000000243 solution Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は金属やセラミックス等の粉末を可塑成形法によ
って成形し、これより焼結品を得るための方法に係わり
、特に可塑成形体の組成および脱脂方法に関する。Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a method for forming powders of metals, ceramics, etc. by a plastic molding method and obtaining a sintered product from the powder, and particularly relates to a method for obtaining a sintered product from the powder, and in particular, and regarding degreasing methods.
「従来の技術」
従来、金属粉末やセラミックス粉末から焼結品を製造す
る方法として、上記粉末に有機パインダ−を配合して混
練し、粉末に流動性を付与してこれを可塑成形し、得ら
れた成形体を脱脂・焼結することによって焼結晶を製造
する方法が知られている。なお、ここでいう可塑成形と
は、射出成形、トランスファー成形および熱間押し出し
成形を意味するものである。``Prior art'' Conventionally, as a method for manufacturing sintered products from metal powder or ceramic powder, the above powder is mixed with an organic binder, kneaded, imparted fluidity to the powder, and then plastically formed. A method is known in which sintered crystals are produced by degreasing and sintering the molded body. In addition, plastic molding here means injection molding, transfer molding, and hot extrusion molding.
これらの成形法によって得られた成形体の脱脂方法とし
ては、加熱によって有機バインダーを蒸発・分解させる
方法が一般的であるが、長時間を要するという欠点があ
る。A common method for degreasing molded bodies obtained by these molding methods is to evaporate and decompose the organic binder by heating, but this method has the drawback of requiring a long time.
また、バインダーを溶媒によって溶出させる溶媒抽出法
も知られている。しかしながら、この方法では、低分子
量のバインダーを用いれば溶出速度が速いため脱脂時間
を短くすることができるものの、成形体の強度が低いも
のとなり、また可塑成形時に低分子量のバインダーが成
形体表面に滲み出す恐れがある。さらに、この溶媒抽出
法では、成形体強度を高めるため高分子量のバインダー
を使用することも試みられているものの、一般の高分子
量バインダーを使用した場合には溶媒による抽出に長時
間を要するといった不都合がある。Also known is a solvent extraction method in which the binder is eluted with a solvent. However, with this method, if a low molecular weight binder is used, the elution rate is fast and the degreasing time can be shortened. There is a risk that it may ooze out. Furthermore, in this solvent extraction method, attempts have been made to use a high molecular weight binder to increase the strength of the molded product, but when using a general high molecular weight binder, extraction with a solvent takes a long time. There is.
これらの問題を解決するため、本発明者等は有機バイン
ダーとして水溶性熱可塑性樹脂であるポリエチレンオキ
サイドと、水に不溶な熱可塑性樹脂と、潤滑剤および／
または可塑剤を含むものを用い、成形体を水に接触せし
めることによってポリエチレンオキサイドを溶出し、脱
脂する方法を提案した。（特願平１−１２８２６１号）
この方法によれば、ポリエチレンオキサイドが高分子で
あり、また水への溶出も速やかであるので、成形体強度
の低下を抑制し、脱脂時間の短縮も図ることができる。In order to solve these problems, the present inventors used polyethylene oxide, which is a water-soluble thermoplastic resin, as an organic binder, a water-insoluble thermoplastic resin, and a lubricant and/or a water-insoluble thermoplastic resin.
Alternatively, a method was proposed in which polyethylene oxide was eluted and degreased by bringing the molded article into contact with water using a material containing a plasticizer. (Patent Application No. 1-128261)
According to this method, since polyethylene oxide is a polymer and is quickly eluted into water, it is possible to suppress a decrease in the strength of the molded article and shorten the degreasing time.
「発明が解決しよとする課題」
しかしながら、上記の方法にあっては、接触させる溶媒
が水であるので、成形体を構成する原料粉末として鉄等
の金属や窒化珪素等の非酸化物を用いた場合、これら粉
末が水中で酸化され、これにより得られる焼結体の焼結
体特性が損なわれる恐れがある。``Problem to be solved by the invention'' However, in the above method, since the solvent to be brought into contact is water, metals such as iron or non-oxides such as silicon nitride are used as the raw material powder constituting the compact. When used, these powders may be oxidized in water, which may impair the properties of the sintered body obtained.
本発明は上記事情に鑑みてなされたもので、その目的と
するところは、粉末の可塑成形において、可塑成形性に
優れ成形体の強度を落とすことなく、また脱脂工程にお
いて粉末を酸化させることなく短時間での脱脂を可能に
するバインダー除去方法を提供することにある。The present invention was made in view of the above circumstances, and its purpose is to provide excellent plastic moldability in the plastic molding of powder without reducing the strength of the molded product, and without oxidizing the powder in the degreasing process. An object of the present invention is to provide a binder removal method that enables degreasing in a short time.
「課題を解決するための手段」□
本発明における請求項１記載の発明の粉末成形体からの
バインダー除去方法では、有機バインダーを、有機溶媒
によって溶出される成分と溶出されない成分とから構成
し、かつ溶出される成分としてポリエチレンオキサイド
を含むものを用い、脱脂処理として、可塑成形体と有機
溶媒とを接触せしめて溶媒により上記の溶出される成分
を溶出し、その後焼結処理を行うことを上記課題の解決
手段とした。"Means for Solving the Problem" □ In the method for removing a binder from a powder compact according to claim 1 of the present invention, the organic binder is composed of a component that is eluted by an organic solvent and a component that is not eluted, In addition, using a material containing polyethylene oxide as the component to be eluted, as a degreasing treatment, the plastic molded body is brought into contact with an organic solvent to elute the component to be eluted with the solvent, and then the above-mentioned sintering treatment is performed. It was used as a means to solve the problem.
また、請求項２記載の発明の粉末成形体からのバインダ
ー除去方法では、上記有機バインダー中の有機溶媒によ
って溶出される成分の量を、全有機バインダーの６０〜
９０重量％としたことを上記課題の解決手段とした。In addition, in the method for removing a binder from a powder compact of the invention according to claim 2, the amount of the component eluted by the organic solvent in the organic binder is set to 60 to 60% of the total organic binder.
A solution to the above problem was to set the content to 90% by weight.
請求項３記載の発明の粉末成形体からのバインダー除去
方法では、ポリエチレンオキサイドの量を、有機溶媒に
よって溶出される成分の８０重量％以上としたことを上
記課題の解決手段とした。In the method for removing a binder from a powder compact according to the third aspect of the invention, the above problem is solved by setting the amount of polyethylene oxide to 80% by weight or more of the component eluted by the organic solvent.
請求項４記載の発明の粉末成形体からのバインダー除去
方法では、ポリエチレンオキサイドの分子量を５万以上
でありかつ５００万以下としたことを上記課題の解決手
段とした。In the method for removing a binder from a powder compact according to the fourth aspect of the invention, the above problem is solved by setting the molecular weight of the polyethylene oxide to 50,000 or more and 5,000,000 or less.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
まず、粉末と有機バインダーとを混合し、これを可塑成
形して成形体とする。ここで粉末として、は、金属粉末
、セラミックス粉末などが用いられるが、本発明の方法
は、粉末として鉄やチタンなどの酸化され易い金属粉末
や、窒化珪素や炭化珪素のような非酸化物であるセラミ
ックス粉末を用いた場合に特に有効である。First, a powder and an organic binder are mixed, and this is plastically molded to form a molded body. Here, metal powders, ceramic powders, etc. are used as powders, but the method of the present invention uses powders of easily oxidized metals such as iron and titanium, and non-oxides such as silicon nitride and silicon carbide. This is particularly effective when certain ceramic powders are used.
有機バインダーとしては、有機溶媒によって溶出される
成分と溶出されない成分とからなり、溶出される成分と
してポリエチレンオキサイドを含むものが用いられる。The organic binder used includes a component that is eluted by the organic solvent and a component that is not eluted, and contains polyethylene oxide as the component that is eluted.
溶出される成分の量とじては、全有機バインダー量の６
０〜９０重量％とするのが好ましい。すなわち、溶出さ
れる成分の量が６０重量％未満である場合には、溶出後
の焼結時において欠陥が生じ易くなり、一方溶出される
成分が９０重量％を越えると、溶出後の成形体の像形成
が不十分になるからである。また、ポリエチレンオキサ
イドの量としては、溶出される成分の８０重量％以上が
望ましい。これは、ポリエチレンオキサイドの量が溶出
される成分の８０重量％未満であると成形体の強度が低
下するからである。ポリエチレンオキサイドの分子量と
しては、５万未満であると流動性、有機溶剤への溶出性
は良好となるものの得られる成形体の強度が不十分とな
り、５００万を超えると逆に成形体強度は十分となるも
のの流動性、有機溶媒への溶出性が不十分となり、した
がって分子量を５万以上、５００万以下の範囲とするの
が好ましく、特に１０万以上、２００万以下の範囲とす
るのが望ましい。The amount of components eluted is 6% of the total amount of organic binder.
It is preferably 0 to 90% by weight. That is, if the amount of the eluted component is less than 60% by weight, defects are likely to occur during sintering after the eluted component, while if the eluted component exceeds 90% by weight, the molded product after the eluted This is because image formation becomes insufficient. Further, the amount of polyethylene oxide is preferably 80% by weight or more of the components to be eluted. This is because if the amount of polyethylene oxide is less than 80% by weight of the components to be eluted, the strength of the molded article will decrease. As for the molecular weight of polyethylene oxide, if it is less than 50,000, the fluidity and elution into organic solvents will be good, but the strength of the molded product obtained will be insufficient, and if it exceeds 5 million, the strength of the molded product will be insufficient. However, the fluidity and dissolution into organic solvents become insufficient. Therefore, it is preferable that the molecular weight is in the range of 50,000 or more and 5,000,000 or less, and particularly preferably in the range of 100,000 or more and 2,000,000 or less. .
有機溶媒に溶出される成分のうち、ポリエチレンオキサ
イド以外の成分としては、ワックス、ステアリン酸等の
潤滑剤やＤＢＰ、ＤＯＰ等の可塑剤などが、溶出速度が
速いことから好適に用いられる。また、溶媒によって溶
出されない成分としては、ポリエチレン、ポリプロピレ
ン、ポリスチレン、ポリメタクリル酸エステル類等の一
般の熱可塑性樹脂が好適に用いられる。Among the components eluted in the organic solvent, other than polyethylene oxide, lubricants such as wax and stearic acid, and plasticizers such as DBP and DOP are preferably used because of their fast elution rate. Further, as components that are not eluted by the solvent, general thermoplastic resins such as polyethylene, polypropylene, polystyrene, polymethacrylic acid esters, etc. are preferably used.
次に、この成形体に脱脂処理を行って脱脂体とする。脱
脂処理としては、まず成形体を常温あるいは加熱された
有機溶媒に接触せしめ、これにより上記有機溶媒によっ
て溶出される成分を溶出する方法が採られる。このとき
、成形体は有機溶媒と接触しているので成形体中の粉末
の酸化が防止されている。ここで、有機溶媒としては、
ポリエチレンオキサイドを十分に溶解し、かつ溶媒によ
って溶出されない成分を侵さない有機溶媒が用いられ、
具体的にはベンゼン、トルエン、キシレン、メタノール
、エタノール、プロパツール、ブタノール、炭酸エチレ
ン、炭酸プロピレン、炭酸メチル、炭酸エチル、炭酸プ
ロピル、炭酸ブチル、テトラヒドロフラン、１−４ジオ
キサン、アニソール、アセトン、メチルエチルケトン、
ジエチルケトン、メチルプロピルケトン、ジクロルエタ
ン、ジクロルメタン、クロロホルム、四塩化炭素、エチ
レングリコール、ジエチレングリコール、トリエチレン
グリコール、プロピレングリコール、カルピトール、ブ
チルセロソルブ、アセトニトリル、ピリジン、ジメチル
ホルムアルデヒド、アセトアルデヒド、エチレンジアミ
ン、プロピレンジアミン等から選択されて用いられる。Next, this molded body is subjected to a degreasing treatment to obtain a degreased body. As the degreasing treatment, a method is adopted in which the molded body is first brought into contact with an organic solvent at room temperature or heated, and thereby the components eluted by the organic solvent are eluted. At this time, since the compact is in contact with the organic solvent, oxidation of the powder in the compact is prevented. Here, the organic solvent is
An organic solvent is used that sufficiently dissolves polyethylene oxide and does not attack the components that are not eluted by the solvent.
Specifically, benzene, toluene, xylene, methanol, ethanol, propatool, butanol, ethylene carbonate, propylene carbonate, methyl carbonate, ethyl carbonate, propyl carbonate, butyl carbonate, tetrahydrofuran, 1-4 dioxane, anisole, acetone, methyl ethyl ketone,
Selected from diethyl ketone, methylpropyl ketone, dichloroethane, dichloromethane, chloroform, carbon tetrachloride, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, carpitol, butyl cellosolve, acetonitrile, pyridine, dimethyl formaldehyde, acetaldehyde, ethylene diamine, propylene diamine, etc. It is used as
成形体と常温あるいは加熱された有機溶媒との接触方法
としては、成形体を有機溶媒中に浸漬する方法が作業性
等の点からもまた溶出時間の短縮といった点からも好適
とされる。また、成形体を有機溶媒中に浸漬した際、常
温あるいは加熱された有機溶媒を流動せしめ、溶出を加
速するのも有効である。As a method of contacting the molded body with the organic solvent at room temperature or at a heated temperature, a method of immersing the molded body in the organic solvent is preferred from the viewpoint of workability and shortening of the elution time. It is also effective to accelerate elution by flowing the organic solvent at room temperature or heating when the molded body is immersed in the organic solvent.
その後、この脱脂体に加熱焼結処理を行い、金属、セラ
ミックスなどからなる焼結体を得る。Thereafter, this degreased body is heated and sintered to obtain a sintered body made of metal, ceramics, or the like.
「作用」
この発明の方法によれば、有機バインダーを、溶媒によ
り溶出される成分と溶出されない成分とから構成し、か
つ溶出される成分としてポリエチレンオキサイドを含む
有機バインダーを用いるので、可塑成形性が良好であり
、また得られる成形体の強度が高いものとなり、さらに
脱脂処理として成形体と有機溶媒とを接触せしめて上記
溶媒によって溶出される成分を溶出するので、溶出に要
する時間が短く、さらに成形体を構成する粉末の酸化が
防止される。"Operation" According to the method of the present invention, the organic binder is composed of a component that is eluted by the solvent and a component that is not eluted, and the organic binder containing polyethylene oxide as the eluted component is used, so that plastic moldability is improved. Furthermore, since the molded product is brought into contact with an organic solvent as a degreasing treatment and the components eluted by the solvent are eluted, the time required for elution is short. Oxidation of the powder constituting the compact is prevented.
「実施例」 以下、実施例により本発明をさらに具体的に説明する。"Example" Hereinafter, the present invention will be explained in more detail with reference to Examples.
純鉄粉（平均粒径５μｍ）１００重量部にポリエチレン
オキサイド８重量部、ポリエチレン２重量部、ステアリ
ン酸０．５重量部を配合し、これらを混線機によって１
５０℃で６０分間混混線た。100 parts by weight of pure iron powder (average particle size 5 μm) was mixed with 8 parts by weight of polyethylene oxide, 2 parts by weight of polyethylene, and 0.5 parts by weight of stearic acid, and these were mixed into 100 parts by weight using a mixer.
Mixing was carried out at 50°C for 60 minutes.
次に、得られた混練物をベレット化し、さらにこれを射
出成形機により、射出温度１７０℃、射出圧力８００
ｋｇ／ ｃｍ″で成形し、２５ｍ＋ａＸ １５ｓ＋ｍＸ
１．５ｍｍの板状部品を得た。Next, the obtained kneaded material was made into pellets, and this was further molded using an injection molding machine at an injection temperature of 170°C and an injection pressure of 800°C.
kg/cm'', 25m+aX 15s+mX
A 1.5 mm plate-shaped part was obtained.
次いで、得られた成形体を５０℃のエチルアルコール中
に浸漬し、溶出率と時間との関係を調べた。その結果を
グラフ化して図面に示す。Next, the obtained molded body was immersed in ethyl alcohol at 50°C, and the relationship between elution rate and time was investigated. The results are graphed and shown in the drawing.
図面に示した結果より、５時間の浸漬時間で全有機バイ
ンダーの約６５重量％が溶出されたことが判明した。From the results shown in the drawings, it was found that about 65% by weight of the total organic binder was eluted after 5 hours of immersion.
さらに、この成形体を真空中にて５００℃に加熱し、残
りのバインダーを除去した後、脱脂体を構成する粉末の
酸素量を測定したところ、約０．５６％であった。なお
、比較のため実施例と同様にして得た成形体の有機バイ
ンダーを、有機溶媒に代わって水で溶出し、さらに上記
と同一の条件で加熱して得られた脱脂体の粉末の酸素量
を調べたところ、０．８５％であった。この結果より、
本発明の方法によって処理された成形体（脱脂体）は、
従来の方法に比較して酸化が抑制されることが確認され
た。Further, this molded body was heated to 500° C. in a vacuum to remove the remaining binder, and then the oxygen content of the powder constituting the degreased body was measured and found to be approximately 0.56%. For comparison, the organic binder of the molded body obtained in the same manner as in the example was eluted with water instead of the organic solvent, and the oxygen content of the powder of the defatted body obtained was further heated under the same conditions as above. When investigated, it was found to be 0.85%. From this result,
The molded body (degreased body) treated by the method of the present invention is
It was confirmed that oxidation was suppressed compared to conventional methods.
その後、溶出後の成形体を水素雰囲気中にて１３５０℃
で２時間焼結したところ、密度が約７．５６ｇ／ｃｍ’
であり、酸素量も０．０４％と十分少ない良好な焼結体
が得られた。After that, the molded body after elution was heated to 1350°C in a hydrogen atmosphere.
After sintering for 2 hours, the density was approximately 7.56 g/cm'
A good sintered body with a sufficiently low oxygen content of 0.04% was obtained.
「発明の効果」
以上説明したように、本発明における請求項１記載の発
明の粉末成形体からのバインダー除去方法は、有機バイ
ンダーを、溶媒により溶出される成分と溶出されない成
分とから構成し、かつ溶出される成分としてポリエチレ
ンオキサイドを含む有機バインダーを用いたものである
から、可塑成形性が良好であり、しかも得られる成形体
の強度を従来の方法によって得る場合に比べ高めること
ができ、さらに脱脂処理として成形体と有機溶媒とを接
触せしめて上記溶媒によって溶出される成分を溶出する
ので、有機バインダー中の溶出成分であるポリエチレン
オキサイドが速やかに溶出されることによって溶出に要
する時間が短かくなり、さらに成形体を構成する粉末の
酸化を防止して良好な焼結体とすることができる。"Effects of the Invention" As explained above, in the method for removing a binder from a powder compact according to claim 1 of the present invention, the organic binder is composed of a component that is eluted by a solvent and a component that is not eluted, In addition, since it uses an organic binder containing polyethylene oxide as an eluted component, it has good plastic moldability, and the strength of the molded product obtained can be increased compared to that obtained by conventional methods. As a degreasing treatment, the molded body is brought into contact with an organic solvent and the components eluted by the solvent are eluted, so the time required for elution is shortened as the polyethylene oxide, which is the eluted component in the organic binder, is quickly eluted. Furthermore, oxidation of the powder constituting the molded body can be prevented and a good sintered body can be obtained.
また、本発明における請求項４記載の発明の粉末成形体
からのバインダー除去方法にあっては、ポリエチレンオ
キサイドとしてその分子量が５万以上でありｉつ５００
万以下のものを用いるため、可塑成形性、有機溶剤への
溶出性、成形体強度に優れたものとなる。In addition, in the method for removing a binder from a powder compact according to claim 4 of the present invention, the polyethylene oxide has a molecular weight of 50,000 or more and 50,000 or more.
Since less than 10,000 yen is used, the molded product has excellent plastic moldability, dissolution into organic solvents, and strength of the molded product.
さらに、本発明の請求項２および３記載の発明の粉末成
形体からのバインダー除去方法にあっては、いずれも請
求項１記載の発明の効果をより一層高めることができる
。Furthermore, in the method for removing a binder from a powder compact according to claims 2 and 3 of the present invention, the effects of the invention described in claim 1 can be further enhanced.
Claims (4)
形して成形体とした後、脱脂・焼結の各処理を行って焼
結体を製造する方法において、上記有機バインダーが有
機溶媒によって溶出される成分と溶出されない成分とか
らなり、溶出される成分としてポリエチレンオキサイド
を含むものが用いられ、 上記脱脂処理として、可塑成形体と有機溶媒とを接触せ
しめて溶媒により溶出される成分を溶出し、その後焼結
処理を行うことを特徴とする粉末成形体からのバインダ
ー除去方法。(1) In a method in which a powder and an organic binder are mixed, the mixture is plastically molded to form a molded body, and a sintered body is manufactured by performing degreasing and sintering treatments, the organic binder is mixed with an organic solvent. It consists of a component to be eluted and a component not to be eluted, and a component containing polyethylene oxide is used as the component to be eluted, and as the degreasing treatment, the plastic molded body is brought into contact with an organic solvent to elute the component to be eluted by the solvent. A method for removing a binder from a powder compact, the method comprising: and then performing a sintering treatment.
除去方法において、上記有機バインダー中の有機溶媒に
よって溶出される成分の量が、全有機バインダーの６０
〜９０重量％であることを特徴とする粉末成形体からの
バインダー除去方法。(2) In the method for removing a binder from a powder compact according to claim 1, the amount of the component eluted by the organic solvent in the organic binder is 60% of the total organic binder.
A method for removing a binder from a powder compact, characterized in that the binder content is 90% by weight.
除去方法において、上記ポリエチレンオキサイドの量が
、有機溶媒によって溶出される成分の８０重量％以上で
あることを特徴とする粉末成形体からのバインダー除去
方法。(3) The method for removing a binder from a powder compact according to claim 1, wherein the amount of polyethylene oxide is 80% by weight or more of the component eluted by the organic solvent. Binder removal method.
除去方法において、上記ポリエチレンオキサイドの分子
量が５万以上でありかつ５００万以下であることを特徴
とする粉末成形体からのバインダー除去方法。(4) The method for removing a binder from a powder compact according to claim 1, wherein the polyethylene oxide has a molecular weight of 50,000 or more and 5,000,000 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2289391A JPH04165005A (en) | 1990-10-26 | 1990-10-26 | Method for removing binder from powder green compact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2289391A JPH04165005A (en) | 1990-10-26 | 1990-10-26 | Method for removing binder from powder green compact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04165005A true JPH04165005A (en) | 1992-06-10 |
Family
ID=17742619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2289391A Pending JPH04165005A (en) | 1990-10-26 | 1990-10-26 | Method for removing binder from powder green compact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04165005A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014508095A (en) * | 2011-02-28 | 2014-04-03 | コーニング インコーポレイテッド | Ceramic composition for improved extrusion |
-
1990
- 1990-10-26 JP JP2289391A patent/JPH04165005A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014508095A (en) * | 2011-02-28 | 2014-04-03 | コーニング インコーポレイテッド | Ceramic composition for improved extrusion |
| JP2016216359A (en) * | 2011-02-28 | 2016-12-22 | コーニング インコーポレイテッド | Ceramic composition for improved extrusion |
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