Silicon nitride jig for hot rolling

Details Silicon nitride jig for hot rolling Silicon nitride jig for hot rolling

1996-01-31

1997-05-13

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 35587

Patent

active

056292503

ABSTRACT:
A ceramic jig for hot rolling is a sintered body consisting essentially of Si.sub.3 N.sub.4, a sintering aid and trace amounts of impurities. In the ceramic jig, crystallization is made among the Si.sub.3 N.sub.4 grains, and a crystalline phase among the grains comprises 80% or more of a J phase, 10% or less of an H phase and 5% or less of a K phase. A reaction of a jig component with iron and water can be inhibited, and the wear of the jig at the time of rolling can be reduced. The seizure of the jig on a steel material does not occur, so that scratches on products can be remarkably reduced.

REFERENCES:
patent: 4920085 (1990-04-01), Yoshida et al.
patent: 4940680 (1990-07-01), Takahashi et al.
patent: 4977112 (1990-12-01), Matsui
patent: 5002907 (1991-03-01), Hayakawa et al.
patent: 5089449 (1992-02-01), Miwa et al.
patent: 5096859 (1992-03-01), Sakai et al.
patent: 5229046 (1993-07-01), Watanabe et al.

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