Effect of Y2O3 on Microstructure and Properties of High Thermal Conductivity Si3N4 Ceramics

Abstract

Abstract: Cost-effective fabrication of high thermal conductivity Si₃N₄ ceramics was realized by using low-cost Si₃N₄ powder with relatively high oxygen content (1.85% (mass fraction)) as raw material and Y₂O₃-MgO as sintering additives. The effect of Y₂O₃ addition on the densification, microstructure, mechanical properties and thermal conductivity of Si₃N₄ ceramics was investigated. The results show that properly increasing the addition of Y₂O₃ not only promotes the densification and microstructure refinement of Si₃N₄ ceramics, but also contributes to the decrease of lattice oxygen content and the improvement of thermal conductivity. The sample containing 7% (mass fraction) Y₂O₃ sintered at 1 900 ℃ has the optimum comprehensive properties, and its relative density, flexural strength, fracture toughness and thermal conductivity are 99.5%, (726±46) MPa, (6.9±0.2) MPa·m^1/2 and 95 W·m^-1·K^-1, respectively.

Key words: ceramics, Si₃N₄, Y₂O₃, thermal conductivity, microstructure, mechanical property, oxygen content

CLC Number:

TQ174

ZHANG Jing, ZHANG Weiru, SUN Feng, XU Xuemin, WANG Zaiyi, LYU Peiyuan, WANG Mei. Effect of Y₂O₃ on Microstructure and Properties of High Thermal Conductivity Si₃N₄ Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2485-2493.

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Effect of Y₂O₃ on Microstructure and Properties of High Thermal Conductivity Si₃N₄ Ceramics

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