2012, Volume 7, Issue 4
Frontiers of Mechanical Engineering >> 2012, Volume 7, Issue 4 doi: 10.1007/s11465-012-0339-y
Feasibility study of plasma sprayed Al2O3 coatings as diffusion barrier on CFC components
Surface Engineering Institute, RWTH Aachen University, 52072 Aachen, Germany
Next Previous
Abstract
Carbon fibre reinforced carbon (CFC) materials are increasingly applied as sample carriers in modern furnaces. Only their tendency to react with different metals at high temperatures by C-diffusion is a disadvantage, which can be solved by application of diffusion barriers. Within this study the feasibility of plasma sprayed Al2O3 coatings as diffusion barrier was studied. Al2O3 coatings were prepared by air plasma spraying (APS). The coatings were investigated in terms of their microstructure, bonding to CFC substrates and thermal stability. The results showed that Al2O3 could be well deposited onto CFC substrates. The coatings had a good bonding and thermal shock behavior at 1060°C. At higher temperature of 1270°C, crack network formed within the coating, showing that the plasma sprayed Al2O3 coatings are limited regarding to their application temperatures as diffusion barrier on CFC components.
Keywords
diffusion barrier coatings ; CFC ; plasma spraying ; microstructure ; Al2O3
京公网安备 11010502051620号
