二维碳/碳-氮化硼复合材料的力学和介电性能研究
Research on Mechanical and Dielectric Properties of 2D Carbon / Carbon-Boron Nitride Composite
程 瑜1,2, 殷小玮1,2, 张鹏飞1,2, 张立同1,2
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作者单位:1. 西北工业大学 超高温复合材料国防科技重点实验室, 陕西 西安 710072; 2. 西北工业大学 凝固技术国家重点实验室, 陕西 西安 710072
中文关键字:C/C复合材料; BN; 介电常数; 介电损耗
英文关键字:carbon/carbon composites; BN; permittivity; dielectric loss
中文摘要:采用先驱体浸渍裂解法(PIP)和低压化学气相渗透工艺(LPCVI)制备了2D C/C-BN复合材料。研究了CVI时间对2D C/C-BN复合材料的组分、微结构、力学性能及介电性能的影响。结果表明:随着沉积时间的延长,材料的孔隙率减小,密度延长。 CVI 80 h后,复合材料的抗弯强度及断裂韧性达到最大值,分别为113 MPa和15 MPa·m1/2。随CVI时间的增加,BN逐渐填充材料内部的孔隙,减少了电磁波在材料内部的反射,降低了对电磁波多次反射损耗的能力,减小了复合材料介电损耗因子。
英文摘要:2D C/C-BN composite was prepared by precursor infiltration pyrolysis (PIP) and low pressure chemical vapor infiltration (LPCVI). The effects of CVI time on the composition, microstructure, mechanical properties and dielectric properties of the composite were studied, respectively. With the increase of CVI time, the porosity of the composite decreases while the density increases. When CVI time reaches 80 h, the flexural strength and fracture toughness of the composite reach the maximum, which is 113 MPa and 15 MPa·m1/2, respectively. With the increase of CVI time, the pores are gradually filled with BN, the reflection loss inside the composite reduces, which causes the decrease of dielectric loss.