Anti-friction lubricant for coating engine pistons
A coating composition for the piston of an internal combustion engine comprises 10-30 wt. % of phenolic resin, 10-30 wt. % of epoxy resin, 10-30 wt. % of at least one solid lubricant selected from the group consisting of graphite, MoS 2 , WS 2 and BN, and 5-30 wt. % of Fe 2 O 3 particles.
1. A piston of an internal combustion engine, comprising, at least in sections of the piston, a coating made from a composition which consists of, based on the total composition:
a) 10 to 30 percent by weight of phenolic resin;
b) 10 to 30 percent by weight of epoxy resin;
c) 10 to 30 percent by weight of at least one solid lubricant selected from the group consisting of graphite, MoS 2 , WS 2 and BN;
d) 5 to 30 percent by weight of Fe 2 O 3 particles; and
e) solvents and additives.
2. A piston according to claim 1 , wherein the at least one solid lubricant includes graphite and MoS 2 .
3. A piston according to claim 1 , comprising the solvents and additives in an amount of 20 to 60 percent by weight, based on the total composition.
4. A piston according to claim 1 , comprising 15 to 20 percent by weight of the at least one lubricant(s).
5. A piston according to claim 1 , comprising 10 to 15 percent by weight of the Fe 2 O 3 particles.
6. A piston according to claim 1 , wherein the ratio of the phenolic resin to the epoxy resin is 1:3 to 3:1.
7. A piston according to claim 1 , comprising 10 to 30 percent by weight of the Fe 2 O 3 particles.
8. A piston according to claim 1 , wherein the coating is disposed on a skirt of the piston.