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US 6,207,627 B1Granted
Oxygen-containing organic compounds as boundary lubricants for silicon nitride ceramics
AssigneeThe United States of America as represented by the Secretary of Commerce
InventorsRichard S. Gates, Stephen M. Hsu
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Abstract
Oxygen-containing compounds, particularly compounds wherein the oxygen is present in OH-groups, such as alcohols, sulfonic and carboxylic acids, or metal salts thereof, serve as lubricants for ceramic materials, particularly silicon nitride materials under high stress and high load conditions.
Claims15
A method for lubricating a silicon nitride ceramic surface which comprises:
- applying to the silicon nitride ceramic surface a composition comprising an alcohol compound, in an amount sufficient to provide a lubricating effect, wherein said alcohol has lubricating activity and is other than an alkanol, a glycol or 2,6-ditertiarybutylcresol.
A method for lubricating a silicon nitride ceramic surface which comprises:
- applying to the silicon nitride ceramic surface a composition comprising an alcohol compound, in an amount sufficient to provide a lubricating effect, wherein said alcohol compound is selected from the group consisting of:
- an aromatic alcohol of the formula (I),
- wherein R3 is independently hydroxy, alkyl of 1-15 carbon atoms or a polyethoxy chain of 1 to 9 ethoxy units, and n is 1 or 2, provided that when R3 is hydroxy n is 1;
- an alkenol of 6-18 carbon atoms;
- an alcohol of the formula (IIA),
- wherein n is 1-18;
- an alcohol of the formula (IIB),
- wherein n is 4-15;
- a Mannich reaction product of the formula (VI),
- wherein R is alkyl of 3-8 carbon atoms and r is 1-4;
- and
- mixtures thereof.
9 more elements
A method for lubricating a silicon nitride ceramic surface which comprises:
- applying to the silicon nitride ceramic surface a composition comprising an alcohol compound, in an amount sufficient to provide a lubricating effect, wherein said alcohol compound is selected from the group consisting of:
- octylphenol having a polyethoxy side chain of 1, 4 or 9 ethoxy units;
- 1,3-dihydroxybenzene;
- 3-n-pentadecylphenol;
- 1-oleil alcohol;
- an alkylaryl polyether of the formula (IIA) wherein n is 1, 5 or 9, and mixtures thereof.
3 more elements
Dependencies are inferred from the claim text.