Bearing material of porous SIC having a trimodal pore composition

US5762895A · kind A · utility

Assignee

• Elektroschmelzwerk Kempten GmbH · DE

Inventors

• Karl-Alexander Schwetz · Kempten (Allgäu), DE
• Anton Katheininger
• Michael Fundus · Kempten, DE
• Jochen Greim · Kempten (Allgäu), DE

Key dates

• Filing date: Dec 20, 1996
• Grant date: Jun 9, 1998
• Expiry date: Dec 20, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C2202/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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 points EQU a=10%M-80%F-10%S EQU b=10%M-10%F-80%S EQU c=40%M-10%F-50%S EQU d=40%M-50%F-10%S and 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.