Repair of zirconia-based thermal barrier coatings
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United States of America Patent
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Issued Date -
Jun 16, 2005
app pub date -
Dec 11, 2003
filing date -
Dec 11, 2003
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Abandoned
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Abstract
A method of depositing a zirconia-based ceramic coating (24) using a low velocity oxy-fuel (LVOF) process. Particles of zirconia (14) are mixed with second constituent particles (16) of a material having a melting temperature sufficiently low to be successfully deposited by an LVOF process. The second constituent particles may have a coefficient of thermal expansion within 30% of that of the zirconia particles, and/or they may have a thermal conductivity less than or no more than 20% higher that that of the zirconia particles. The second constituent particles may include calcium titanate, strontium titanate or sodium-zirconium-phosphat-e-silicate (NZPS). The capability to deposit the zirconia-containing particle mix with an LVOF process facilitates the in-situ repair of a component having a damaged zirconia-based thermal barrier coating.
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