United States Patent [19] [11] Patent Number: 4,919,829
Gates et al. [45] Date of Patent: Apr. 24, 1990
[56] References Cited
U.S. PATENT DOCUMENTS
4,294,687 10/1981 Pinaue et al 228/58
4.492.682 1/1985 Trebillon 423/625
4,529,718 7/1985 Dupin 423/628
4.657.683 4/1987 Davies 252/12
4,657,754 4/1987 Bauer et al 423/625
Primary Examiner—Jacqueline V. Howard
Attorney, Agent, or Firm—Thomas Zack; Alvin J.
Englert; James A. Oliff
[57] ABSTRACT
Aluminum hydroxides are used as solid lubricants for aluminum oxides, ceramics and other materials having oxide surfaces. Aluminum oxide hydroxides and aluminum trihydroxides are preferred compositions for such lubricating purposes. In particular, the use of boehmite in an aqueous solution significantly reduces frictional coefficients between contacting surfaces.
21 Claims, 5 Drawing Sheets
