Microstructure and Thermal Shock Resistance of ZrB2 and ZrB2-20vol% SiC Compositesfrom Aqueous Tape Casting

doi:10.3724/SP.J.1077.2011.00244

Abstract

Abstract: The microstructure and thermal shock resistance of ZrB₂ and ZrB₂-20vol% SiC(ZS20) composites prepared by aqueous tape casting and hot-pressing were investigated. Zr-B-C and Zr-B-W solid solution phases were formed in ZS20 composites, but not formed in ZrB₂ samples. The diffraction peaks for ZrB₂ of ZS20 composites shifted to higher 2 θ values possibly due to the formation of solidsolution phases which resulted in a decrease in lattice parameters. The critical thermal shock values for ZrB₂ and ZS20 were measured to be298℃ and 306℃ respectively using water quench tests. The thermal shock resistance of ZrB₂ and ZS20 were also calculated and compared with the experimental data. The results revealed that the measured thermal shock resistance of ZS20 composites was lower than the calculated ones, which might be due to the thermal residualstress in the samples resulted from the difference in thermal expansion coefficient of ZrB₂ matrix and SiC second phase as well as the solid solutions phases.

Key words: ZrB₂, ZrB₂-20vol% SiC, microstructure, thermal shock resistance

CLC Number:

TQ174

Lv Zhi-Hui, , JIANG Dong-Liang, ZHANGJing-Xian, LIN Qing-Ling, HUANG Zheng-Ren. Microstructure and Thermal Shock Resistance of ZrB₂ and ZrB₂-20vol% SiC Compositesfrom Aqueous Tape Casting[J]. Journal of Inorganic Materials, 2011, 26(3): 244-248.

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Microstructure and Thermal Shock Resistance of ZrB₂ and ZrB₂-20vol% SiC Compositesfrom Aqueous Tape Casting

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