Method of improving quality of hot pressed Si.sub.3 N.sub.4 bodi

Details Method of improving quality of hot pressed Si.sub.3 N.sub.4 bodi Method of improving quality of hot pressed Si.sub.3 N.sub.4 bodi

1984-07-12

1986-11-18

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 49, 264 66, 264344, 423344, 501 97, C04B 3558, C04B 3804

Patent

active

046234985

ABSTRACT:
A method of improving the quality of hot pressed Si.sub.3 N.sub.4 bodies is disclosed. Unpurified silicon powder and admixed oxygen carrying agents are compacted to form a preform. The preform is nitrided, facilitated by the presence of certain impurities, to agglomerate the mixture to an increased density no greater than 2.7 gm/cm.sup.3. The nitrided preform is immersed in one or more stages in one or more leaching solutions of effective concentration to remove the selected impurities. The treated preform is then hot pressed to full density accompanied by a substantial reduction or absence of undesirable impurities such as iron silicide, which can conventionally form during hot pressing.

REFERENCES:
patent: 966399 (1910-08-01), Higgins
patent: 3839540 (1974-10-01), Arrol
patent: 4146379 (1979-03-01), Copley et al.
patent: 4177235 (1979-12-01), Neidhardt
patent: 4238434 (1980-12-01), Enomoto

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