Thermal spray compositions for abradable seals

Coating processes – Spray coating utilizing flame or plasma heat – Metal or metal alloy coating

Reexamination Certificate

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Details

C427S446000, C427S455000, C427S449000, C427S450000, C427S451000, C427S422000, C277S415000

Reexamination Certificate

active

06887530

ABSTRACT:
A thermal spray composition and method of deposition for abradable seals for use in gas turbine engines, turbochargers and steam turbines. The thermal spray composition includes a solid lubricant and a ceramic preferably comprising 5 to 60 wt % total of the composition in a ratio of 1:7 to 20:1 of solid lubricant to ceramic, the balance a matrix-forming metal alloy selected from Ni, Co, Cu, Fe and Al and combinations and alloys thereof. The solid lubricant is at least one of hexagonal boron nitride, graphite, calcium fluoride, lithium fluoride, magnesium fluoride, barium fluoride, tungsten disulfide and molybdenum disulfide particles. The ceramic includes at least one of albite, illite, quartz and alumina-silica.

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