Author/Authors :
Xie، نويسنده , , Liangde and Chen، نويسنده , , Dianying and Jordan، نويسنده , , Eric H. and Ozturk، نويسنده , , Alper and Wu، نويسنده , , Fang and Ma، نويسنده , , Xinqing and Cetegen، نويسنده , , Baki M. and Gell، نويسنده , , Maurice، نويسنده ,
Abstract :
When tailored to make durable thermal barrier coatings (TBCs), the Solution Precursor Plasma Spray (SPPS) process produces a microstructure containing uniformly vertical cracks. These cracks provide a high degree of strain tolerance to the ceramic top coat. In order to understand the formation of vertical crack in SPPS process, coatings of various thicknesses were deposited on a variety of substrates with vastly different thermal properties. These coatings were characterized in the as-sprayed state and after heat treatment. It has been determined that the tensile stress derived from the pyrolysis of precursor occurring during coating deposition or post heat-treatment is the major driving force for the formation of vertical cracks in SPPS TBCs.
Keywords :
Thermal barrier coatings , plasma spray , Solution precursor plasma spray , Vertical cracks
