期刊
JOURNAL OF ADVANCED CERAMICS
卷 10, 期 6, 页码 1317-1325出版社
SPRINGER
DOI: 10.1007/s40145-021-0506-0
关键词
aluminum nitride (AlN); boron nitride (BN); mechanical properties; thermal conductivity
资金
- Basic Science Center Project of NSFC [51788104]
- National Natural Science Foundation of China [51532004, 11704216]
The machinability of aluminum nitride-hexagonal boron nitride (AlN-h-BN) ceramics can be improved while maintaining high strength and thermal conductivity by incorporating up to 30 wt% BN as a secondary phase and using yttrium oxide as a sintering aid. The addition of sintering additives helps purify grain boundaries and enhance densification. The optimal BN content enhances flexural strength and fracture toughness of the composite ceramics.
It is possible to improve the machinability of aluminum nitride-hexagonal boron nitride (AlN-h-BN) ceramics while maintaining high strength and high thermal conductivity. The composite ceramics with 0-30 wt% BN as secondary phase were prepared by hot pressed sintering, using yttrium oxide (Y2O3) as sintering aid. The phase composition, density, microstructure, mechanical properties, thermal conductivity, and dielectric properties were investigated. The sintering additives were favorable to purify the grain boundaries and improve densification, reacting with oxide impurities on the surface of raw material powder particles. The optimum BN content improved the flexural strength and fracture toughness of composite ceramics with 475 MPa and 4.86 MPa center dot m(1/2), respectively. With increasing the amount of BN, the thermal conductivity and hardness of composites gradually decreased, but the minimum value of thermal conductivity was still 85.6 W center dot m(-1)center dot K-1. The relative dielectric constant and dielectric loss tangent of the samples ranged from 6.8 to 8.3 and from 2.4 x 10(-3) to 6.4 x 10(-3), respectively, in 22-26 GHz.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据