Effect of BN whiskers on dielectric and mechanical properties of BNw/Si3N4 composites
Effect of BN whiskers on dielectric and mechanical properties of BNw/Si3N4 composites
复制标题
BN晶须对BNw/Si3N4复合材料介电和机械性能的影响
DOI：
10.1179/143307511x13018917925946
复制
发表时间：
2011-06-01
影响因子：
--
通讯作者：
Zhao, L.
中科院分区：
文献类型：
--
作者：
Zhao, D. L.;Zhang, Y. J.;Zhao, L.
采用N-2气氛中1800℃气压烧结制备了BN晶须增强Si3N4(BNw/Si3N4)微波透明复合材料。研究了BN晶须对BNw/Si3N4复合材料介电性能和机械性能的影响。结果表明，与BN颗粒的添加相比，BN晶须的添加可以有效提高BNw/Si3N4复合材料的介电性能，同时保持较好的力学性能。含有15 vol.-% BN晶须的复合材料的介电常数、弯曲强度和断裂韧性分别达到3.8、215 MPa和4.31 MPa·m(1/2)。复合材料的主要晶相是h-BN和β-Si3N4。 BN 晶须和棒状 β-Si3N4 的互锁微观结构是 BNw/Si3N4 复合材料相对良好机械性能的原因。
BN whisker reinforced Si3N4 (BNw/Si3N4) microwave transparent composites were prepared by gas pressure sintering at 1800 degrees C in N-2 atmosphere. The effects of BN whiskers on the dielectric and mechanical properties of BNw/Si3N4 composites were investigated. The results showed that the addition of BN whiskers could effectively improve the dielectric properties of BNw/Si3N4 composites while maintaining relatively good mechanical properties compared with the addition of BN particles. The dielectric constant, bending strength and fracture toughness of the composites with 15 vol.-% BN whiskers reached 3.8, 215 MPa and 4.31 MPa m(1/2) respectively. The principal crystal phases of the composites were h-BN and beta-Si3N4. The interlocked microstructure of BN whiskers and rod-like beta-Si3N4 was responsible for the relatively good mechanical properties of BNw/Si3N4 composites.