Method of casting powder
AssigneeNKK Corporation
InventorsHiroaki Nishio, Akira Kato, Michitaka Sato, Keiji Watanabe
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Abstract
In the method of invention, the formability is imparted to the slurry of a metal or ceramic powder by employing a porous mold and removing the dispersion medium through the evaporation or thermal decomposition thereof, or by using a silazane oil as the dispersion medium and curing it by heating. Since the phase change usually accompanying volume change does not occur in the dispersion medium, strain and deformation rarely occur in the molded body. As result, the sintered body obtained has high dimensional accuracy.
Claims13
A method of casting a metal or ceramic powder which comprises casting a slurry of 45 to 85 vol. % of the metal or ceramic powder suspended in a dispersion medium into a porous mold having a strength to resist a casting pressure of at least 3 kg/cm.sup.2 and a capacity to absorb the dispersion medium contained in the cast slurry in the porous mold which is insufficient for the molded body to maintain a molded form without a mold and heating the slurry placed in the porous mold to remove the dispersion medium through the evaporation or the decomposition of the dispersion medium.
A method of casting a metal or ceramic powder suspended in a dispersion medium containing at least 30 wt. of a silazane oil into a porous mold, curing the dispersion medium by heating at a temperature of 100.degree. to 200.degree. C., and then demolding.
A method of casting a metal or ceramic powder into a formed solid product which comprises casting a slurry of 45 to 85 vol. % of the metal or ceramic powder suspended in a dispersion medium into a porous mold having a strength to resist a casting pressure of at least 3 kg/cm.sup.2 and heating the slurry placed in the porous mold to remove the dispersion medium through the evaporation or the decomposition of the medium, said formed solid product resulting from the heating forcing the evaporated dispersion medium or decomposition production of the dispersion medium through the porous mold to the exterior of the porous mold.
Dependencies are inferred from the claim text.