Y2O3对高热导率Si3N4陶瓷显微结构和性能的影响

摘要/Abstract

摘要： 以氧含量相对较高的“平价”Si₃N₄粉体(氧含量1.85%(质量分数))为原料,Y₂O₃-MgO作为烧结助剂,制备低成本高热导率Si₃N₄陶瓷,研究Y₂O₃含量对Si₃N₄陶瓷致密化、显微结构、力学性能及热导率的影响。结果表明,适当增加Y₂O₃的加入量不仅可以促进Si₃N₄陶瓷的致密化和显微结构的细化,还有助于晶格氧含量的降低和热导率的提升。Y₂O₃含量为7%(质量分数)的样品在1 900 ℃烧结后的综合性能最佳,其相对密度、抗弯强度、断裂韧性和热导率分别为99.5%、(726±46) MPa、(6.9±0.2) MPa·m^1/2和95 W·m^-1·K^-1。

关键词: 陶瓷, Si₃N₄, Y₂O₃, 热导率, 显微结构, 力学性能, 氧含量

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

中图分类号:

TQ174

张晶, 张伟儒, 孙峰, 徐学敏, 王再义, 吕沛远, 王梅. Y₂O₃对高热导率Si₃N₄陶瓷显微结构和性能的影响[J]. 硅酸盐通报, 2022, 41(7): 2485-2493.

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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Y₂O₃对高热导率Si₃N₄陶瓷显微结构和性能的影响

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

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