Low-mid turbine temperature abradable coating
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United States of America Patent
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Jan 23, 2007
Grant Date -
Dec 22, 2005
app pub date -
Jun 21, 2004
filing date -
Jun 21, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to minimize a clearance between a turbine and its housing, and thus, improve the efficiency of a turbine engine, an abradable coating can be applied to an inner surface of the turbine housing. However, there are no known abradable coatings that can be applied to a housing that is subjected to temperatures between 950 1500.degree. F. for extended periods of time. The apparatus of the present disclosure includes a housing including a 950 1500.degree. F. section in which at least one rotating blade row is positioned. The rotating blades and the 950 1500.degree. F. section each includes a surface being comprised of a relatively non-abradable material. The surface of the housing comprised of the relatively non-abradable material is covered by a 950 1500.degree. F. relatively abradable coating that includes a metallic matrix and at least one of a thermoplastic and dry lubricant. The metallic matrix is 55 85% of the coating by volume.
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