Abstract: The invention relates to bearing materials of porous SiC having a trimodal pore composition and also a process for their production.The porous bearing material of pressureless-sintered SiC having from 3 to 10% by volume of independent closed pores having a trimodal pore composition consisting of micropores (M), fiber-shaped macropores (F) and spherical macropores (S), where the amounts in the pore system F-M-S (FIG. 1) are fixed by the trapezoidal area having the corner pointsa=10%M-80%F-10%Sb=10%M-10%F-80%Sc=40%M-10%F-50%Sd=40%M-50%F-10%Sand the micropores have a diameter of less than or equal to 5 .mu.m and the fiber-shaped macropores have a diameter of less than or equal to 30 .mu.m and a length of less than or equal to 80 .mu.m and the spherical macropores have a diameter of less than or equal to 70 .mu.m, and have a flexural strength of at least 250 MN/m.sup.2.
Type:
Grant
Filed:
December 20, 1996
Date of Patent:
June 9, 1998
Assignee:
Elektroschmelzwerk Kempton, GmbH
Inventors:
Karl Alexander Schwetz, Anton Katheininger, Michael Fundus, Jochen Greim