Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1989-08-11
1990-10-23
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 10, 419 11, 419 13, 419 14, 419 17, 419 18, 419 45, 75230, 75236, 75239, 75240, 75244, 75245, 75248, B22F 300
Patent
active
049650440
ABSTRACT:
The present invention relates to a method of sintering ceramics and ceramics obtained by said method. According to the present invention, the synthesis and sintering of ceramics can be simultaneously carried out by utilizing the reaction heat generated when at least one metallic element selected from metallic elements of IIb, IVb, Vb and VIb groups of the Periodic Table is combined with at least one nonmetallic element such as B, C N and Si without heat or by preliminarily heating the ceramics at temperatures remarkably lower than the usual sintering temperature ceramics thus-produced are superior in abrasion resistance and corrosion resistance. Furthermore, according to the present invention, particles of the same kind of metal as that used in constructing the ceramics comprising the above described metallic elements and nonmetallic elements are dispersed in a matric comprising said ceramics to obtain metal dispersed reinforced ceramics in which both the matrix and the metallic particles are strongly and chemically bonded to each other. According to the latter procedure, ceramic materials having high temperature characteristics, high corrosion resistance and high abrasion resistance, as well as high toughness and high impact resistance can be obtained.
REFERENCES:
patent: 3353954 (1967-11-01), Williams
patent: 4610726 (1986-09-01), King
patent: 4689077 (1987-08-01), Chevigne et al.
patent: 4746363 (1988-05-01), DeAngelis
Crider, Joey F., "Self--Propagating High Temperature Synthesis-A Soviet Method for Producing Ceramic Materials", Ceramic Eng. & Science Proceedings, Sep.-Oct. 1982, pp. 519-528.
Honda Masaaki
Kamijo Eiji
Koizumi Mitsue
Komura Osamu
Miyamoto Yoshinari
I. Sumitomo Electric Industries, Ltd.
Koizumi Mitsue
Lechert Jr. Stephen J.
Miyamoto Yoshinari
Nigohosian, Jr. Leon
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