Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics

Young Wook Kim; Toshiyuki Nishimura; Mamoru Mitomo

doi:10.4028/www.scientific.net/KEM.403.185

Paper Titles

New Theory of Transformation Induced Grain Growth in Porous SiC
p.169

Evaluation of Microstructure of High-Strength Reaction-Sintered Silicon Carbide
p.173

Nano-Grained Microstructure Design of Silicon Carbide Ceramics by SPS Process
p.177

Macro- and Micro-Scale Thermal Conductivities of SiC Single Crystal and Ceramic
p.179

Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics
p.185

Microstructural and Mechanical Properties of Ti₃SiC₂ Composites
p.189

Effect of HfO₂ Coating Films on Oxidation Resistance of SiC Ceramics
p.193

High Temperature Oxidation of SiC Powder in Oxidizing Atmosphere Containing Water Vapor
p.197

Applying SiC Nanoparticles to Functional Ceramics for Semiconductor Manufacturing Process
p.201

HomeKey Engineering MaterialsKey Engineering Materials Vol. 403Influence of Additives on Mechanical Properties in...

Influence of Additives on Mechanical Properties in Liquid-Phase Sintered Silicon Carbide Ceramics

Abstract:

The effect of sintering additives comprising AlN and RE2O3 (RE=Lu, Yb, Er and Y) in 2:3 and 3:2 molar ratios on mechanical properties of liquid-phase-sintered (LPS) and subsequently annealed SiC ceramics was investigated. The toughness vs cationic radius curve had a maximum in both 2:3 and 3:2 molar ratios; Yb-doped specimens showed maximal toughness of 5.8 and 6.6 MPa..m1/2 in 2:3 and 3:2 molar ratios, respectively. There was no correlation between room temperature (RT) strength and cationic radius. In contrast, the high temperature (HT) strength vs cationic radius curve had a minimum in both 2:3 and 3:2 molar ratios; Yb-doped specimens showed minimal strength of 520 MPa and 550 MPa in 2:3 and 3:2 molar ratios, respectively. The present results suggest that there is a trade-off in improving both RT toughness and HT strength in LPS-SiC ceramics.

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Periodical:

Key Engineering Materials (Volume 403)

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185-188

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https://doi.org/10.4028/www.scientific.net/KEM.403.185

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Online since:

December 2008

Authors:

Young Wook Kim, Toshiyuki Nishimura, Mamoru Mitomo

Keywords:

Additive Composition, Silicon Carbide (SiC), Strength, Toughness

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