首页|Design CuZr alloy to control Ti diffusion and reaction layer thickness in C/C-TC4 joins
Design CuZr alloy to control Ti diffusion and reaction layer thickness in C/C-TC4 joins
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NSTL
Elsevier
? 2022Brazing C/C composites and Ti6Al4V (TC4) can expand their practical applications, but the too much brittle TiC at C/C side is harmful to joint strength. The key to high-quality brazing joints is to control the excessive diffusion of Ti element from TC4 and TiC reaction layer at C/C. Herein, a new type of CuZr brazing alloy was designed, since Cu element can react with Ti, and Ti element are infinitely miscible in Zr. The interfacial microstructures showed that CuZr alloy reacted with Ti to form Ti2Cu + (Zr, Ti)2Cu, preventing diffusing Ti and optimizing reaction layer thickness. The effects of brazing temperature and holding time on microstructure changes were analyzed. When the temperature and holding time was insufficient, TiC+ZrC reaction layer was formed not well and inhomogeneous Ti(s, s) and Ti2Cu were dispersed in (Zr, Ti)2Cu, leading to a relatively low shear strength. Microstructures of continuous TiC+ZrC reaction layer and homogeneous (Zr, Ti)2Cu + Ti2Cu were optimized as temperature and holding time increased. Optimal microstructure of the joints was brazed at 970 °C for 10 min, which was C/C-TiC+ZrC/Ti2Cu + (Zr, Ti)2Cu/Ti(s, s)-TC4, and the joint reached the maximum shear strength about 54.2 MPa.
C/C compositesCuZr alloyReaction layerTi elementTi-Cu-Zr system
Li P.、Yan Y.、Ba J.、Liu B.、Lin J.、Cao J.、Qi J.
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State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology
NSTL
Elsevier
