TY - JOUR
T1 - BN纤维束增强氮化物复合材料的制备与性能
AU - Li, Jianping
AU - Cheng, Laifei
AU - Ye, Fang
AU - Cheng, Zanlin
AU - Liu, Yongsheng
AU - Zhang, Mingxia
N1 - Publisher Copyright:
© 2018, Science Press. All right reserved./Copyright © 2018, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - BN f /BN, BN f /SiBN and BN f /Si 3 N 4 mini-composites were fabricated by low pressure chemical vapor deposition/infiltration (LPCVD/CVI) process. The microstructure, tensile property and dielectric property of BN fiber bundle and these three mini-composites were investigated. Results indicate that BN fiber is composed of h-BN with low crystallinity, whose phase structure is unchanged after heat treatment at 650℃ and 800℃. A large amount of micro pores with size of 50~500 nm exist on the surface of BN fiber. Mean tensile strength of BN fiber bundle heat treated at 800℃ is 94 MPa. Average tensile strengths of BN f /BN, BN f /SiBN and BN f /Si 3 N 4 mini-composites decrease in turn, which are 68.8, 30.6 and 26.2 MPa, respectively. Three mini-composites all exhibit brittle fracture behavior, owing to the modulus mismatch between fiber and matrix and strong interphase bond strength. Cracks cannot be effectively deflected and fibers cannot bear the load effectively. Real part of dielectric constant and dielectric loss are lower than 3 and 0.04, respectively, leading to good electromagnetic wave transmitting property. BN f /BN possesses the best comprehensive performance.
AB - BN f /BN, BN f /SiBN and BN f /Si 3 N 4 mini-composites were fabricated by low pressure chemical vapor deposition/infiltration (LPCVD/CVI) process. The microstructure, tensile property and dielectric property of BN fiber bundle and these three mini-composites were investigated. Results indicate that BN fiber is composed of h-BN with low crystallinity, whose phase structure is unchanged after heat treatment at 650℃ and 800℃. A large amount of micro pores with size of 50~500 nm exist on the surface of BN fiber. Mean tensile strength of BN fiber bundle heat treated at 800℃ is 94 MPa. Average tensile strengths of BN f /BN, BN f /SiBN and BN f /Si 3 N 4 mini-composites decrease in turn, which are 68.8, 30.6 and 26.2 MPa, respectively. Three mini-composites all exhibit brittle fracture behavior, owing to the modulus mismatch between fiber and matrix and strong interphase bond strength. Cracks cannot be effectively deflected and fibers cannot bear the load effectively. Real part of dielectric constant and dielectric loss are lower than 3 and 0.04, respectively, leading to good electromagnetic wave transmitting property. BN f /BN possesses the best comprehensive performance.
KW - BN fiber
KW - Chemical vapor infiltration
KW - Dielectric property
KW - Mechanical property
KW - Nitride ceramic matrix composites
UR - http://www.scopus.com/inward/record.url?scp=85060164010&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:85060164010
SN - 1002-185X
VL - 47
SP - 2901
EP - 2908
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 9
ER -