The Microstructure and Mechanical Properties of Si<sub>3</sub>N<sub>4f</sub>/BN/SiBCN Microcomposites Fabricated by the PIP Process
Zhiyou Gong,
Zhongkai Xu,
Jian Zhang,
Ruisong Guo,
Yao Han,
Xiaohong Sun,
Zhuang Yuan,
Xinqi Zhao,
Bingqing Zhang,
Chunming Zheng
Affiliations
Zhiyou Gong
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Zhongkai Xu
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Jian Zhang
Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China
Ruisong Guo
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Yao Han
Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China
Xiaohong Sun
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Zhuang Yuan
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Xinqi Zhao
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
Bingqing Zhang
Aerospace Institute of Advanced Materials & Processing Technology, Beijing 100074, China
Chunming Zheng
State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China
SiBCN ceramics based on SiC, BN and Si3N4 structures have good comprehensive properties such as high-temperature resistance, oxidation resistance, creep resistance and long life, which makes it one of the very promising ceramic material systems in military and aerospace fields, etc. In this study, SiBCN ceramics, as well as Si3N4f/BN/SiBCN microcomposites, were prepared by a polymer infiltration pyrolysis method using PBSZ as the polymer precursor. The PBSZ was completely ceramized by pyrolysis at 900 °C. The weight loss and elemental bonding forms of the products after the pyrolysis of the precursors hardly changed from 600 °C to 900 °C. After pyrolysis at 600 °C for 4 h and using the BN coating obtained from twice deposition as the interfacial phase, a more desirable weak interface of fiber/matrix with a binding strength of 21.96 ± 2.01 MPa can be obtained. Si3N4f/BN/SiBCN ceramic matrix microcomposites prepared under the same pyrolysis conditions have a relatively good tensile strength of 111.10 MPa while retaining a weak interface between the fibers and the matrix. The results of the study provide more theoretical and methodological support for the application of new composite structural ceramic material systems.
