Slip Casting and Pressureless Sintering of ZrB2-SiC Ceramics

doi:10.3724/SP.J.1077.2009.00831

Abstract

Abstract: The dispersion of ZrB₂ particles in water was investigated using polyethyleneimine (PEI) as a dispersant. Results showed that the ZrB₂ slurry had a isoelectric point of pH=5.7. The application of PEI changed the isoelectric point of the ZrB₂ slurry to pH=11.5. High solids loading (45vol%) ZrB₂-20vol% SiC slurries were prepared at pH=8.0 by adding 1.0wt% PEI. The green body prepared by slip casting had a relative density of 53%. The effects of boron as a sintering aid on the pressureless sintering process of the ZrB₂-20vol% SiC ceramics were investigated. Nearly fully dense ZrB₂- SiC composites were obtained by sintering at 2100℃ for 3 h. The sintered ceramics demonstrated a Vickers hardness of (17.5±0.5)GPa, a flexure strength of (406±41)MPa,and a fracture toughness of (4.6±0.4)MPa·m^1/2.

Key words: ZrB₂-SiC, slip casting, pressureless sintering

CLC Number:

TB332

WANG Xin-Gang,LIU Ji-Xuan,KAN Yan-Mei,ZHANG Guo-Jun,WANG Pei-Ling. Slip Casting and Pressureless Sintering of ZrB₂-SiC Ceramics[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00831.

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Slip Casting and Pressureless Sintering of ZrB₂-SiC Ceramics

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