无压烧结氮化硅陶瓷的物理性能研究

摘要/Abstract

摘要： 以α-Si₃N₄粉末为原料,Y₂O₃和MgAl₂O₄体系为烧结助剂,采用无压烧结方式,研究了烧结温度、保温时间、烧结助剂含量以及各组分配比对氮化硅致密化及力学性能的影响。结果表明:以Y₂O₃和MgAl₂O₄为烧结助剂体系,氮化硅陶瓷在烧结温度为1 600 ℃,保温时间为4 h,烧结助剂含量为12.5%(质量分数),Y₂O₃和MgAl₂O₄质量比为1∶1时,综合性能最好;氮化硅陶瓷显气孔率为0.21%,相对密度为98.10%,抗弯强度为598 MPa,维氏硬度为15.55 GPa。

关键词: 氮化硅, 无压烧结, 显气孔率, 相对密度, 抗弯强度, 维氏硬度

Abstract: Silicon nitride ceramics were sintered by pressureless sintering with α-Si₃N₄ powder as raw material, and Y₂O₃ combined with MgAl₂O₄ as sintering aids. The effects of sintering temperature, holding time, content of sintering aids and composition ratio on the densification and mechanical properties of the silicon nitride ceramics were studied. The results show that silicon nitride ceramics can be fully densified by the addition of Y₂O₃ and MgAl₂O₄ sintering aids. Using Y₂O₃ and MgAl₂O₄ as sintering aids system, when the sintering temperature is 1 600 ℃,the holding time is 4 h, the content of sintering aids is 12.5% (mass fraction), and the mass ratio of Y₂O₃ and MgAl₂O₄ is 1∶1,the pressureless sintered silicon nitride ceramics achieve the best comprehensive properties with apparent porosity of 0.21%, the relative density of 98.10%, the bending strength of 598 MPa and Vickers hardness of 15.55 GPa.

Key words: silicon nitride, pressureless sintering, apparent porosity, relative density, bending strength, Vickers hardness

中图分类号:

TQ174

武振飞, 王跃超, 陆丽芳, 张弘毅. 无压烧结氮化硅陶瓷的物理性能研究[J]. 硅酸盐通报, 2022, 41(5): 1782-1787.

WU Zhenfei, WANG Yuechao, LU Lifang, ZHANG Hongyi. Physical Properties of Silicon Nitride Ceramics by Pressureless Sintering[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1782-1787.

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