High temperature low friction surface coating
AssigneeMechanical Technology Incorporated
InventorBharat Bhushan
Life of this patent
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Abstract
A high temperature, low friction, flexible coating for metal surfaces which are subject to rubbing contact includes a mixture of three parts graphite and one part cadmium oxide, ball milled in water for four hours, then mixed with thirty percent by weight of sodium silicate in water solution and a few drops of wetting agent. The mixture is sprayed 12-15 microns thick onto an electro-etched metal surface and air dried for thirty minutes, then baked for two hours at 65.degree. C. to remove the water and wetting agent, and baked for an additional eight hours at about 150.degree. C. to produce the optimum bond with the metal surface. The coating is afterwards burnished to a thickness of about 7-10 microns.
Claims4
In a compliant hydrodynamic gas bearing for high temperature applications, a flexible bearing sheet with one bearing surface, and a relatively rotating rigid member with an opposing bearing surface, the improvement comprising:
- a flexible coating of less than 12 microns thickness on the bearing surface of the flexible bearing sheet, including a layer of CdO and graphite in proportions of about 1:3 by weight, dispersed in a fused matrix of 28%-32% by weight sodium silicate.
In a hydrodynamic gas bearing, for high temperature applications, including a stationary member and a relatively rotating member, each member having a bearing surface facing the bearing surface of the other member, the improvement comprising:
- a hard oxide or carbide coating on the bearing surface of said rotating member;
- and
- a solid coating bonded to the bearing surface of said stationary member, including a dispersion of CdO and graphite powders, in proportions of about 1:3 by weight, in a fused matrix of about 28%-32% by weight of sodium silicate.
Dependencies are inferred from the claim text.