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Updated: Jan 3, 2026
Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
Published on: October 6, 2017
On Interfacial Microstructure Evolution in an Isothermally Exposed SiC Fiber-Reinforced Ti-17 Matrix Composite
1AECC Beijing Institute of Aeronautical Materials, Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, Key Laboratory of Aeronautical Materials Testing and Evaluation, Aero Engine Corporation of China, Beijing100095, China.
Abstract:
The kinetics and mechanisms of interface reactions in a unidirectional continuous SiC fiber-reinforced Ti-17 matrix composite were investigated using transmission electron microscopy and scanning electron microscopy. It was found that a reaction zone (RZ) consisting of two-layered TiC-type carbide forms at the fiber/matrix interface during fabrication of the composite. After isothermal exposure at elevated temperatures, the two-layered TiC-type carbide is inherited, and a new TiC-type carbide layer forms within the RZ after exposure at temperatures lower than 900°C, while a new Ti3C2-type carbide layer forms after exposure at 900°C. It was also observed that the growth of RZ is a diffusion-controlled and temperature-dependent process, obeying the Fick's law-based parabolic relationship and the Arrhenius equation. Two material constants, the temperature-independent rate constant k0 and activation energy Q, are determined as 31.5 × 10-4µm/s1/2 and 49.9 kJ/mol, respectively.
