Study on process and properties of the atmospheric plasma spray nanozirconia coating

The optimum process parameters of nanozirconia thermal barrier coating were optimized by the orthogonal experiments which took bond strength as measurement index,and the bond strength,thermal-shock resistance and heat-insulating property of nanozirconia coating were investigated.The test results show that the bond strength of nanozirconia coating with optimizing process can reach 33 MPa;its thermal-shock resistance is good.The nanozirconia coating can suffer 22 times thermal shock during cooling water test at 1 050 ℃;its heat-insulating effect is apparent;there existes 300~600 ℃ difference between flame and coating surface and 100~200 ℃ difference between coating surface and backside of sample.