Bearing material of silicon carbide

Details Bearing material of silicon carbide Bearing material of silicon carbide

C - Chemistry, Metallurgy

04

B

C04B 35/565 (2006.01) C04B 35/573 (2006.01) F16C 33/04 (2006.01)

Patent

CA 2220238

A bearing material of silicon carbide particularly useful for application in the hot water field is provided having improved corrosion resistance under increased thermal stresses wherein the bearing material is characterized by a predominantly course-grained silicon carbide matrix of pressureless sintered silicon carbide having a biamodal grain sized distribution wherein the biomodal grain size distribution is formed by from 50 to 90% by volume of prismatic, tabular, silicon carbide crystallites having a length of from 100 to 1500 µm and from 10 to 50% by volume of prismatic tabular silicon carbide crystallites having a length of from 5 to < 100 µm.

Divulgation d'un matériel de roulement en carbure de silicium particulièrement utile dans l'eau chaude. Le matériel se distingue par sa résistance supérieure à la corrosion sous de plus grands stress thermiques. Il se distingue par sa matrice de carbure de silicium fritté sans pression principalement à grains grossiers. Les grains suivent une distribution bimodale, soit environ 50 à 90 % en volume de cristallites de carbure de silicium prismatiques tubulaires mesurant de 100 à 1 500 mum de longueur et environ 10 à 50 % en volume de cristallites de carbure de silicium prismatiques tubulaires mesurant de 5 à <100 mum de longueur.

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