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Relationship Between Properties and Microstructure of Plasma Sprayed Boron Carbide Coating

ZENG Yi; FENG Jing-Wei; ZHANG Ye-Fang; DING Chuan-Xian(Shanghai institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)  
The microstructure and the electronic conductivity of plasma sprayed boron carbidecoating were studied. The results show that B_4C phase in the coating exists in two major structuregrained and flaky structures. Metal Fe as the impurity phase in the coating is the key factorresulting in the abnormality of electronic conductivity of B_4C coating. Another impurity phase,which consists of B, C and Fe elements, will decrease the microhardness of B_4C coating.
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