ZrB2-SiC陶瓷的注浆成型与无压烧结

doi:10.3724/SP.J.1077.2009.00831

摘要/Abstract

摘要： 研究了以聚乙烯亚胺 (PEI) 为分散剂，ZrB₂粉体在水相中的分散性能. 结果显示ZrB₂的等电点在pH为5.7，加入PEI后的等电点移到pH为11.5. 以PEI为分散剂，在pH为8.0处制备了固含量达45vol%的ZrB₂-20vol%SiC陶瓷浆料. 采用注浆成型方法制备了相对密度为53%的ZrB₂-SiC陶瓷坯体，并对其进行了无压烧结，同时研究了硼粉为烧结助剂对其致密化及性能的影响. 结果表明：硼粉为烧结助剂，实现了ZrB₂-SiC陶瓷的完全致密化的同时，也降低了ZrB₂-SiC陶瓷的烧结温度，2100℃烧结3h后的陶瓷维氏硬度为(17.5±0.5)GPa，弯曲强度为(406±41)MPa，断裂韧性为(4.6±0.4)MPa·m^1/2.

关键词: ZrB₂-SiC, 注浆成型, 无压烧结

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

中图分类号:

TB332

王新刚,刘吉轩,阚艳梅,张国军,王佩玲. ZrB₂-SiC陶瓷的注浆成型与无压烧结[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2009.00831.

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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ZrB₂-SiC陶瓷的注浆成型与无压烧结

Slip Casting and Pressureless Sintering of ZrB₂-SiC Ceramics

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