Sliding member of graphite-boron carbides
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United States of America Patent
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Jan 20, 1987
Grant Date -
N/A
app pub date -
Jul 17, 1985
filing date -
Jul 20, 1984
priority date (Note) -
Expired
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Abstract
Disclosed herein is a high temperature-resistant and abrasion-resistant sliding member of graphite-boron carbides showing the friction coefficient of 0.01 to 0.13 and the specific abrasion amount of 10.sup.-7 to 10.sup.-9 mm.sup.2 /kg under the measuring conditions of the load of 20 kg/cm.sup.2 and the sliding velocity of 5 m/min at a temperature of 300.degree. C., the bending strength of 300 to 1600 kg.f/cm.sup.2 and the Shore hardness of from 45 to 60, obtained by mixing and stirring from 65 to 95% by weight of powdery carbon of an average particle size of 10 to 150 .mu.m and from 5 to 35% by weight of powdery boron carbide of an average particle size of 0.5 to 2.5 .mu.m until the powdery boron carbide is uniformly dispersed in the powdery carbon, and sintering the thus formed mixture at a temperature of 2020.degree. C. or more and less than the transition point at which the structure of carbon and boron carbide in the thus formed mixture is remarkably changed, under a pressure of 100-250 kg/cm.sup.2.
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