Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Elemental metal or boron – or alloyed metal
Patent
1997-03-10
1998-05-05
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Elemental metal or boron, or alloyed metal
508161, 508166, 508167, 508169, C10M 1300
Patent
active
057474281
ABSTRACT:
A self-lubricating solid coating that contains three layers of lubricants is disclosed. The solid lubricant may be prepared from chromium silicide or chromium carbide; disulfide and diselenide of tungsten, molybdenum, niobium, or tantalum; and silver or gold. This material combination provides superior wear and friction reduction over the temperature range applied. In this invention, chromium silicide or chromium carbide is a hard lubricant with a low wear property to protect the substrate metal; disulfide or diselenide is a soft lubricant with a very low coefficient of friction; and silver or gold with their high thermal conductivity are effective in conducting heat especially at high sliding velocities. Both silver and gold have a low friction coefficient with high oxidative stability. The use of this solid lubricant allows engine manufacturers to develop high temperature engine and partially or totally eliminate the use of liquid lubricants in engines, thus reducing the environmental pollution caused by liquid lubricants in various engines.
REFERENCES:
patent: 4647386 (1987-03-01), Jamison
patent: 4756841 (1988-07-01), Buran et al.
patent: 5282985 (1994-02-01), Zabinski et al.
Low Friction Composite Coating of Chromium Silicide/Molybdenum. Werkstofforsch. Dresden Surf. Coat. Technol. 60(1-3), 515-20, 1993.
Howard Jacqueline V.
Toomer Cephia D.
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