Appeal No. 96-3374
Application No. 08/115,974
friction-resisting performances can be obtained even at high
temperature with dry conditions in which engines are used.2
Rao discloses to decrease the friction between an
annular body 20 on a piston 13 and an opposing cylinder wall
12, a solid film lubricant coating 35 (see Figure 6)
containing either BN or MoS with graphite may be applied to
2
the cylinder wall. Rao teaches that this coating comprises
about 40% by weight of a high temperature thermoplastic resin
such as polyarylsulfone, 40% graphite, and 20% of either MoS2
or BN. Rao further discloses that a suitable resin that is
thermally stable up to about 700°F. is polymer 360, known as
Astrel, manufactured by Minnesota Mining and Manufacturing
Company. Rao teaches that after the cylinder wall surface is
thoroughly cleaned to remove any oxidation, such wall may be
grit blasted to increase porosity and thereby the reception of
the coating. Rao discloses that BN will break down as a3
structural solid at about 750°F. and MoS will do so at about
2
2See column 5, lines 32-35, and column 6, lines 3-11, of
Oda.
3See column 6, lines 10-28, of Rao.
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