Pressureless Sintering of ZrB2-SiC Ceramics Incorporating Sol-Gel Synthesized Ultra-Fine Ceramic Powders

Hui Zhang; Yong Jie Yan; Zheng Ren Huang; Xue Jian Liu; Dong Liang Jiang

doi:10.4028/www.scientific.net/KEM.434-435.193

Paper Titles

Electronic Structures and Chemical Bonding of the Layered Tungsten Borides: An Ab Initio Calculation
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Effects of Carbon Black on Microstructure and Mechanical Properties of Hot Pressed ZrB₂-SiC Ceramics
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Influence of Hot Pressing Temperature and SiC Content on the Microstructure and Mechanical Properties of ZrB₂-SiC
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Pressureless Sintering of ZrB₂-SiC Ceramics Incorporating Sol-Gel Synthesized Ultra-Fine Ceramic Powders
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Joining of Advanced Ceramics, Glasses and Composites at Politecnico di Torino, Italy
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 434-435Pressureless Sintering of ZrB2-SiC Ceramics...

Pressureless Sintering of ZrB₂-SiC Ceramics Incorporating Sol-Gel Synthesized Ultra-Fine Ceramic Powders

Abstract:

Ultra-high temperature ceramic composites of ZrB2-SiC were densified by pressureless sintering. Ultra-fine ZrB2-SiC composite powders synthesized by sol-gel method were mixed with commercial ZrB2 and SiC powders. The sintered body of hybrid powders (combined commercial and synthesized composite powders) showed excellent properties not only in the relative density but also the flexure strength. Dry-pressed compacts using 4wt% Mo as a sintering aid were sintered to nearly full density at 2200°C/2h. The average strength was ~560MPa and the maximum was ~632MPa. SEM and TEM showed that SiC particles were distributed homogenously in the ZrB2 matrix and the average particle size was ~5μm. From HRTEM observations, the grain boundaries were apparently free of glassy phases and no intermediate phases existed.

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Key Engineering Materials (Volumes 434-435)

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193-196

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https://doi.org/10.4028/www.scientific.net/KEM.434-435.193

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Online since:

March 2010

Authors:

Hui Zhang, Yong Jie Yan, Zheng Ren Huang, Xue Jian Liu, Dong Liang Jiang

Keywords:

Mechanical Property, Sintering, ZrB₂-SiC

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