Journal of Northeastern University(Natural Science) ›› 2022, Vol. 43 ›› Issue (8): 1105-1112.DOI: 10.12068/j.issn.1005-3026.2022.08.006

• Materials & Metallurgy • Previous Articles     Next Articles

Interfacial Reaction and Thermal Stability of SiCf/Ti2AlNb Composites

FU Yue-chun1, WEI Ze-qi1, YANG Li-na2, WANG Yu-min2   

  1. 1. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
  • Revised:2021-07-19 Accepted:2021-07-19 Published:2022-08-11
  • Contact: FU Yue-chun
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Abstract: The layer of interfacial reaction(IR)is an important influencing factor on mechanical properties of SiC fiber (SiCf) reinforced titanium matrix composites. The interfacial reaction, element distribution at the interface and interfacial thermal stability of SiCf/Ti2AlNb composites during hot isostatic pressing and thermal exposure procedures are studied. The results show that the main IR product in SiCf/Ti2 AlNb composites is TiC, and the TiSi2 and NbSi2 phases are observed during the thermal exposure procedure. The thickness of IR layer in the SiCf/Ti2AlNb composite obeys the Arrhenius law, and the growth rate of IR layer increases with the thermal exposure temperature. The activation energy for the IR layer growth is 24.27kJ/mol, and the frequency factor is 2.80×10-4 m/s1/2. The interface of SiCf/Ti2AlNb composites shows good thermal stability at 700℃ and below.

Key words: titanium matrix composites; Ti2AlNb; interfacial reaction; element diffusion; thermal stability

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