Coatings of non-oxide ceramics for improved corrosion resistance in high temperature coal combustion. Quarterly progress report No. 2, September 1--December 31, 1994

摘要

High temperature alkali corrosion has caused premature failure of SiC and Si(sub 3)N(sub 4) components used in advanced high temperature coal combustion systems. The objective of this research is to develop and characterize CMZP ((Ca(sub 0.6)Mg(sub 0.4)))Zr(sub 4)(Po(sub 4))(sub 6) and Mg-doped Al(sub 2)TiO(sub 5) coatings on dense SiC and Si(sub 3)N(sub 4) heat exchanger materials and to strive to expand the existing knowledge of the mechanism of coal combustion corrosion of SiC and Si(sub 3)N(sub 4) in the temperature range 1,000 to 1,400 C.