Interfacial Reactions and Mechanical Properties Studies of C-Coated and C/B4C Duplex-Coated SiC Fiber-Reinforced Ti2AlNb Composites

Shuming Zhang; Minjuan Wang; Mao Wen; Jianhong Chen; Hu Li; Chuan Xie; Wangtengfei Fan; Qingfeng Wang; Hao Huang

doi:10.3390/ma12193257

Interfacial Reactions and Mechanical Properties Studies of C-Coated and C/B₄C Duplex-Coated SiC Fiber-Reinforced Ti₂AlNb Composites

Materials (Basel). 2019 Oct 6;12(19):3257. doi: 10.3390/ma12193257.

Authors

Shuming Zhang¹, Minjuan Wang², Mao Wen³, Jianhong Chen⁴, Hu Li⁵, Chuan Xie⁶, Wangtengfei Fan⁷, Qingfeng Wang⁸, Hao Huang⁹

Affiliations

¹ State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China. smzhang89@yeah.net.
² AECC Beijing Institute of Aeronautical Materials, P.O.Box: 81-15, Beijing 100095, China. juanjuanyuer@yeah.net.
³ State Key Laboratory of Superhard Materials, Department of Materials Science, Key Laboratory of Automobile Materials, MOE, Jilin University, Changchun 130012, China. wenmao225@163.com.
⁴ State Key Laboratory of Superhard Materials, Department of Materials Science, Key Laboratory of Automobile Materials, MOE, Jilin University, Changchun 130012, China. jhchen19@yeah.net.
⁵ AECC Beijing Institute of Aeronautical Materials, P.O.Box: 81-15, Beijing 100095, China. lihu989@163.com.
⁶ AECC Beijing Institute of Aeronautical Materials, P.O.Box: 81-15, Beijing 100095, China. xiechuan1990@163.com.
⁷ AECC Beijing Institute of Aeronautical Materials, P.O.Box: 81-15, Beijing 100095, China. 17888803196@163.com.
⁸ State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China. wqf67@ysu.edu.cn.
⁹ AECC Beijing Institute of Aeronautical Materials, P.O.Box: 81-15, Beijing 100095, China. huanghaoxj@126.com.

Abstract

Continuous SiC fiber-reinforced Ti₂AlNb matrix composites have a great potential for high-temperature aviation structure applications, and their properties strongly depend on the microstructure of the interfacial reaction layer. Notably, introducing diffusion barrier coatings has still been a popular strategy for optimizing the interfacial structure and interfacial properties of SiC_f/Ti. In this work, C coating and C/B₄C duplex coating were successfully fabricated onto SiC fibers via chemical vapor deposition (CVD), then consolidated into the SiC_f/C/Ti₂AlNb and the SiC_f/C/B₄C/Ti₂AlNb composites, respectively, via hot isostatic pressing (HIP) under the condition of 970 °C, 150 MPa, 120 min, and finally furnace cooled to room temperature. The C- and C/B₄C-dominated interfacial reactions in the SiC_f/C/Ti₂AlNb and the SiC_f/C/B₄C/Ti₂AlNb were explored, revealing two different reaction products sequences: The different-sized TiC and the coarse-grained (Ti,Nb)C + AlNb₃ for the SiC_f/C/Ti₂AlNb; and the fine-grained TiB₂ + TiC, the needle-shaped (Ti,Nb)B₂/NbB + (Ti,Nb)C, the coarse-grained (Ti,Nb)C + AlNb₂ for the SiC_f/C/B₄C/Ti₂AlNb. Annealing experiments were further carried out to verify the different reaction kinetics caused by C coating and C/B₄C duplex coating. The reaction layer (RL)-dominated interfacial strength and tensile strength estimations showed that higher interface strength and tensile strength occurred in the SiC_f/C/Ti₂AlNb instead of the SiC_f/C/B₄C/Ti₂AlNb, when the same failure mode of fiber push-out took place.

Keywords: C coating; C/B4C duplex coating; SiCf/Ti2AlNb composite; interfacial reaction; tensile strength.

Abstract

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