Nkk Corporation

Nippon Kokan Kabushiki Kaisha

Government Industrial Research Institute

Kazuya Yabuta

Hiroaki Nishio

Tsuneo Miyashita

Yoshio Takagi

Seiki Umebayashi

Kazushi Kishi

A ceramic material comprising a double phase complex sialon sintered body of .beta.'-type sialon and O'-type sialon being composed of the four elements of Si,Al,O and N and having a ratio of .beta.'-type sailon/O'-type sialon of 7/1 to 3/5 by weight ratio. The .beta.'-phase-O'-phase complex sailon has a dense structure and is excellent in high strength and high oxidation-resistance.

High strength high oxidation-resistance sialon sintered body

The invention is concerned with the method of compression molding a metallic or ceramic powders. The method includes the step of maintaining a negative pressure within a first mold of noncompactable powders for intimately contacting on its inner surface a pouch-like member of thin-walled resilient material for producing a second mold, and the step of compactly charging starting powders into the second mold and exhausting air from and sealing the second mold, taking out a pre-molded body of the metallis or ceramic powders together with the second mold and the step of processing the pre-molded body by a cold or hot isostatic press.

Method for molding of powders

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Tokyo, Japan

Kazuya Yabuta