三元复合烧结助剂Er2O3-Mg2Si-Yb2O3对氮化硅陶瓷性能的影响

摘要/Abstract

摘要： 以Er₂O₃-Mg₂Si-Yb₂O₃为三元复合烧结助剂,制备了力学性能优异的高导热氮化硅陶瓷,研究了Er₂O₃-Mg₂Si-Yb₂O₃体系对氮化硅陶瓷致密化、微观结构、力学性能、热导率的影响。研究表明,当添加5%(质量分数,下同)Er₂O₃+2%Mg₂Si+4%Yb₂O₃烧结助剂时,烧结助剂对氮化硅陶瓷致密度与晶界相含量的平衡效果最佳,此时氮化硅陶瓷具有最佳性能:抗弯强度为765 MPa,断裂韧性为7.2 MPa·m^1/2,热导率为67 W/(m·K)。在烧结过程中,只添加5%Er₂O₃+2%Mg₂Si的烧结助剂产生的液相量少且黏度高,不能使氮化硅陶瓷完成致密化;此外,当添加的Yb₂O₃含量超过4%时,烧结助剂产生大量的晶界相,降低了氮化硅陶瓷的性能。

关键词: 氮化硅陶瓷, Er₂O₃-Mg₂Si-Yb₂O₃烧结助剂, 致密度, 微观结构, 力学性能, 热导率

Abstract: High thermal conductivity Si₃N₄ ceramics with excellent mechanical properties were prepared by using ternary composite sintering agent Er₂O₃-Mg₂Si-Yb₂O₃. The effects of Er₂O₃-Mg₂Si-Yb₂O₃ system on densification, microstructure, mechanical properties and thermal conductivity of Si₃N₄ ceramics were studied. The results show that when the sintering agent is 5% (mass fraction, the same below) Er₂O₃+2%Mg₂Si+4%Yb₂O₃, the effect of sintering agent on the balance between density and the content of grain boundary phase of Si₃N₄ ceramics is the best. At the moment, Si₃N₄ ceramics have the best properties, such as bending strength of 765 MPa, fracture toughness of 7.2 MPa·m^1/2, and thermal conductivity of 67 W/(m·K). In the sintering process, adding only 5%Er₂O₃+2%Mg₂Si produces less liquid phase with high viscosity, which cannot densify the Si₃N₄ ceramics. When the content of Yb₂O₃ exceeds 4%, the sintering agent produces a large amount of grain boundary phase, which reduces the properties of Si₃N₄ ceramics.

Key words: silicon nitride ceramics, Er₂O₃-Mg₂Si-Yb₂O₃ sintering agent, density, microstructure, mechanical property, thermal conductivity

中图分类号:

TQ174.75

姜常玺, 周立娟, 庄英华, 廖圣俊, 王建军. 三元复合烧结助剂Er₂O₃-Mg₂Si-Yb₂O₃对氮化硅陶瓷性能的影响[J]. 硅酸盐通报, 2022, 41(4): 1423-1432.

JIANG Changxi, ZHOU Lijuan, ZHUANG Yinghua, LIAO Shengjun, WANG Jianjun. Effect of Ternary Composite Sintering Agent Er₂O₃-Mg₂Si-Yb₂O₃ on Properties of Silicon Nitride Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(4): 1423-1432.

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三元复合烧结助剂Er₂O₃-Mg₂Si-Yb₂O₃对氮化硅陶瓷性能的影响

Effect of Ternary Composite Sintering Agent Er₂O₃-Mg₂Si-Yb₂O₃ on Properties of Silicon Nitride Ceramics

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