Journal of Inorganic Materials

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Slip Casting and Pressureless Sintering of ZrB2-SiC Ceramics

WANG Xin-Gang1,2, LIU Ji-Xuan1, KAN Yan-Mei1, ZHANG Guo-Jun1, WANG Pei-Ling1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-10-17 Revised:2008-12-19 Online:2009-07-20 Published:2009-07-20
  • Contact: ZHANG Guo-Jun

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·m1/2.

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

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