Central Glass Company, Limited

National Institute for Research in Inorganic Materials

Hitoshi Tsukuda

Akira Sakanoue

Yoshizo Inomata

Hidehiko Tanaka

A process for sintering cubic system silicon carbide powder, which comprises compacting a mixture of cubic system silicon carbide powder with more than 1% by weight and not more than 3% by weight of carbon and at least 0.10% by weight and less than 0.3% by weight of boron and sintering the compact thereby obtained, under vacuum or in a chemically inert atmosphere at a temperature of from 1,900.degree. to 2,200.degree. C.

Process for sintering cubic system silicon carbide powder

Graphite fluoride, such as (CF).sub.n or (C.sub.2 F).sub.n, in powder form coated with a vinylic polymer, e.g. polymethyl methacrylate, which is bonding to the surfaces of the graphite fluoride particles by graft polymerization. The polymer-coated graphite fluoride retains unique properties of graphite fluoride such as high lubricating ability, can readily be dispersed in water and organic liquids, and can readily be press-shaped with or without the addition of a synthetic resin powder. The polymer-coated graphite fluoride is prepared by dispersing graphite fluoride in powder form and at least one vinylic monomer which undergoes radical polymerization in a mixture of water and either a water-soluble organic solvent or a surface-active agent, and then adding a polymerization initiator to the aqueous dispersion. The polymerization reaction takes place even at room temperature and can be promoted by heating up to 70.degree. C.

Growing community of inventors

Ube, Japan

Hitoshi Tsukuda