Repair of zirconia-based thermal barrier coatings

摘要

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-phosphate-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.