SGER- Development of Iota-Alumina Coatings

[122539] basuan SGER奖支持在莫来石-iota氧化铝体系中沉积成分分级涂层的可行性研究。目的是开发能够在热循环中不剥落的情况下为SiC和Si3N4陶瓷提供高温氧化和耐腐蚀性的涂层。目的是CVD沉积一层莫来石（3al2o3.2 . sio2）涂层在陶瓷基板的界面上，并逐渐将成分转变为与莫来石具有相同晶体结构的iota-氧化铝相的纯氧化铝。将对涂层的晶体结构、热膨胀性能和高温抗氧化性能进行评估

0122539BasuAn SGER award supports a study of the feasibility of depositing compositionally graded coatings in the mullite-iota alumina system. The intent is to develop coatings which will provide high temperature oxidation and corrosion resistance to SiC and Si3N4 ceramics without spalling during thermal cycles. The intent is to CVD deposit a coating which is mullite (3Al2O3.2SiO2) at the interface with the ceramic substrate and to gradually change the composition to pure alumina of the iota-alumina phase, which has the same crystal structure as mullite. The coatings will be evaluated for crystal structure, thermal expansion properties, and high temperature oxidation resistance.***