Binder for injection molding of metal powder or ceramic powder and molding composition and molding method wherein the same is used
AssigneeYamaha Corporation
InventorsKatsunori Suzuki, Toshiharu Fukushima
Life of this patent
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Abstract
The present invention relates to a molding method characterized by kneading a binder comprising an agar having an average molecular weight of 30,000 to 150,000 with a metal powder, a ceramic powder, or a mixed powder thereof, injection-molding the thus obtained molding composition into a green body, removing at least the water from the green body, and then sintering the green body to obtain a molded product.
Claims17
A binder for injection molding of a metal powder and/or a ceramic powder, comprising an agar selected to have an average molecular weight of 30,000 to 150,000 and water, wherein said binder leaves less than about 0.4% carbon residue in a sintered molded body.
A binder for injection molding of a metal powder and/or a ceramic powder comprising 15 to 35 parts by weight of an agar having an average molecular weight of 30,000 to 150,000 to 100 parts by weight of water.
A binder for injection molding of a metal powder and/or a ceramic powder comprising an agar having an average molecular weight of 30,000 to 150,000, water, alcohol and/or a water soluble polymer, wherein the alcohol is used in an amount of 5 to 30 parts by weight to 100 parts by weight of water, and the water-soluble polymer is used in an amount of 5 to 10 parts by weight to 100 parts by weight of water and alcohols.
A binder for injection molding of a metal powder and/or ceramic powder comprising an agar having an average molecular weight of 30,000 to 150,000 and water, wherein the agar has a gel strength of 200 to 480 g/cm2 at 4% gel concentration.
A molding composition comprising:
- a binder comprising an agar selected to have an average molecular weight of 30,000 to 150,000 and water, and
- at least one selected from the group consisting of a metal powder, a ceramic powder, and mixtures thereof, wherein the binder leaves less than about 0.4% carbon residue in a sintered molded body.
A molding composition, comprising a binder including an agar having an average molecular weight of 30,000 to 150,000 and water, and at least one selected from the group consisting of a metal powder, a ceramic powder, and a mixture thereof, wherein the metal powder has an average particle diameter of 1 to 200 μm;
- and
- the ceramic powder has an average particle diameter of 0.1 to 10 μm.
A molding composition, comprising a binder including an agar having an average molecular weight of 30,000 to 150,000 and water, and at least one selected from the group consisting of a metal powder, a ceramic powder, and a mixture thereof, wherein the metal powder and the ceramic powder are pretreated with a coupling agent.
A molding composition, comprising a binder including an agar having an average molecular weight of 30,000 to 150,000 and water, and at least one selected from the group consisting of a metal powder, a ceramic powder, and a mixture thereof, wherein said molding composition includes 35 to 70% by volume of at least one of the metal powder, said ceramic powder, and the mixture.
A method of injection-molding a metal powder and/or a ceramic powder comprising:
- 1) preparing a binder comprising an agar having an average molecular weight of 30,000 to 150,000 and water, and at least one of a metal powder a ceramic powder, and mixtures thereof to prepare a molding composition,
- 2) pretreating at least one of a metal powder, a ceramic powder, and mixtures thereof with a coupling agent,
- 3) mixing the binder with at least one of the metal powder, the ceramic powder, the mixtures thereof with a coupling agent;
- 4) injection molding the molding composition to form a desired-shaped green body;
- and
- 5) sintering the green body.
A method of injection-molding a metal powder and/or a ceramic powder, comprising the steps of:
- 1) selecting an agar having ail average molecular weight of 30,000 to 150,000;
- 2) mixing said agar and water and at least one of a metal powder, a ceramic powder and mixtures thereof, to prepare a molding composition;
- 3) injection-molding said molding composition to form a desired-shaped green body;
- and
- 4) sintering said green body.
Dependencies are inferred from the claim text.