Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Patent
1984-12-03
1986-10-14
Stallard, Wayland
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
75 05B, 75 05BC, 75252, B22F 900
Patent
active
046170553
ABSTRACT:
A ceramic surface-metallic core particle composite fine powder material is disclosed, composed of fine particles each having a metallic core and a ceramic surface layer, in which the average value of the ratio of the thickness of the surface layer of a powder particle to the radius of the particle is subtantially greater than 0.05. A method and an apparatus for making this material from core metal and a gas which combines with the core metal to form the ceramic outer layer are also described, in which a gaseous mixture of vapor of the core metal and the gas is passed through a convergent-divergent nozzle and is thereby rapidly cooled by adiabatic expansion so that the core metal as it solidifies forms metal cores for fine particles while the gas reacts with the outer layers of these particles to form ceramic surface layers.
REFERENCES:
patent: 3846084 (1974-11-01), Pelton
patent: 4072771 (1978-02-01), Grier
patent: 4174211 (1979-11-01), Ohmura et al.
patent: 4484943 (1984-11-01), Miura et al.
Katagiri Hidenori
Miura Hirohisa
Natsume Toshio
Satou Hiroshi
Stallard Wayland
Toyota Jidosha & Kabushiki Kaisha
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