Claims
- 1. A process for preparing a valve assembly for use in an engine, the assembly including a valve stem guide comprising an intermixed phase composite of a metal, a metal oxide, and silicon carbide, and a valve reciprocatingly received therewithin, the method including the steps of:
- providing a fluid lubricant in the form of a resin suspension of a lubricant selected from the group consisting of boron nitride, molybdenum disulfide, graphite, and mixtures thereof;
- removing the metal phase from the face of the composite to create anchoring sites for retaining the lubricant;
- exposing the face of the composite to the fluid lubricant so that the lubricant may infiltrate the anchoring sites;
- subjecting the lubricant-covered face to a vacuum environment to expel air from the anchoring sites;
- restoring ambient pressure to propel the lubricant into the anchoring sites; and
- desiccating the composite and the lubricant to create an article of manufacture in which a solid film, dry lubricant is impregnated into the face of the composite.
- 2. A process for preparing a valve assembly for use in an engine, the assembly including a valve seat insert comprising an intermixed phase composite of a metal, a metal oxide and silicon carbide, and a valve head intermittently received by the valve seat, the method including the steps of:
- providing a fluid lubricant in the form of a resin suspension of a lubricant selected from the group consisting of boron nitride, molybdenum disulfide, graphite, and mixtures thereof;
- removing the metal phase from the valve seat insert to create anchoring sites for retaining the lubricant;
- exposing the valve seat insert to the fluid lubricant so that the lubricant may infiltrate the anchoring sites formed within the valve seat insert;
- subjecting the lubricant-covered valve seat insert to a vacuum environment to expel air from the anchoring sites;
- restoring ambient pressure to propel the lubricant into the anchoring sites; and
- desiccating the valve seat insert and the lubricant to create an intermixed composite of solid film, dry lubricant which is impregnated into the valve seat insert.
- 3. A process for preparing a valve assembly for use in an engine, the assembly including a valve stem guide and a valve seat insert comprising an intermixed phase composite of a metal, a metal oxide, and silicon carbide, the method including the steps of:
- providing a fluid lubricant in the form of a resin suspension of a lubricant selected from the group consisting essentially of boron nitride, molybdenum disulfide, graphite, and mixtures thereof;
- removing the metal phase from the valve stem guide and the valve seat insert to create anchoring sites for retaining the lubricant;
- impregnating the lubricant into the anchoring sites; and
- curing the resin so that the lubricant forms a solid dry film thereof which is disposed upon the valve stem guide and the valve seat insert.
Parent Case Info
This is a divisional of application Ser. No. 07/869,291, filed on Apr. 13, 1992, now U.S. Pat. No. 5,295,461.
US Referenced Citations (23)
Foreign Referenced Citations (4)
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Date |
Country |
0224345 |
Jun 1987 |
EPX |
2155765 |
Jun 1972 |
DEX |
5578119 |
Jun 1980 |
JPX |
56-115804 |
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Non-Patent Literature Citations (1)
Entry |
"Friction and Wear Properties of a Ceramic Matrix Composite Produced by Directed Metal Oxidation", R. K. Dwivedi, Ceram. Eng. Sci. Proc.12[9-10], pp. 2203-2221, Oct. 1991. |
Divisions (1)
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Number |
Date |
Country |
Parent |
869291 |
Apr 1992 |
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