Relationship between process parameters and microstructure and wear characteristicsof plasma sprayed nanostructured Al2O3-TiO2 ceramic coatings

摘要

The wear characteristics of plasma spray coated layer of Alumina-Titaina composite powder have beeninvestigated, in this study, focusing on the effect of particle size of Alumina powder and parameters of plasmaspray coating process. Alumina-Titania composite powders were artificially agglomerated into the size suitable forplasma spray coating process. The process condition for plasma spray coating has been optimized through astatistical data treatment method I.e. response surface analysis. Mechanical properties of coated layer have beenmeasured as a function of the initial Alumina particle size. The structure of Alumina nano-powders in the coatedlayer was found to be affected by flow rates of Ar and H2 gases, and the power of plasma in a combinational way.The relationship between the wear characteristics of coated layer and process parameters and microstructure ofthe coated layer was elucidated, by measuring the size distribution, temperature, and velocity of traveling Alumina-Titania composite powder agglomerates.