Polycrystalline shaped body of silicon carbide and method for it

Details Polycrystalline shaped body of silicon carbide and method for it Polycrystalline shaped body of silicon carbide and method for it

1981-11-23

1984-12-04

Bell, Mark

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

C04B 3556

Patent

active

044865430

ABSTRACT:
Polycrystalline shaped body of a density of at least 98% of the theoretical density of silicon carbide, consisting of at least 92 weight % of .alpha.-silicon carbide and/or .beta.-silicon carbide, which is present in the form of a homogeneous texture with grains of maximal 10 .mu.m, and is characterized by the fact that, besides a content of up to 3 weight % of boron, a share of about 0.5 to 5 weight % of a metal or rare earth element that acts reducing or mixtures thereof is present, and the body shows a transverse rupture strength (determined by the four-point method) of at least 500 N/mm.sup.2 up to 1,400 C and is essentially free of free carbon.
A method for the production of shaped bodies through the pressureless sintering of the silicon carbide starting material, characterized by the fact that about 0.5 to 5% of metals or rare earth elements are added individually or as mixtures to the starting material, that the resulting starting material mixture is shaped, and the shaped body pressureless sintered at temperatures from 1,900.degree. to 2,200.degree. C. under vacuum or in a protective gas atmosphere.

REFERENCES:
patent: 4004934 (1977-01-01), Prochazka
patent: 4097293 (1978-06-01), Komeya et al.
patent: 4124667 (1978-11-01), Coppola et al.

Affiliated with

Also associated with

Rating

Polycrystalline shaped body of silicon carbide and method for it does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polycrystalline shaped body of silicon carbide and method for it, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polycrystalline shaped body of silicon carbide and method for it will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1583040