Novelty phase synthesis mechanism and morphology in resin-bonded Al-Al2O3-TiO2 composites at high temperatures under flowing N2
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An Al-AlN core-shell structure is beneficial to the performance of Al-Al2O3 composites. In this paper, the phase evolution and microstructure of Al-Al2O3-TiO2 composites at high temperatures in flowing N2 were investigated after the Al-AlN core-shell structure was created at 853 K for 8 h. The results show that TiO2 can convert Al into Al3Ti (~1685 K), which reduces the content of metal Al and rearranges the structure of the composite. Under N2 conditions, Al3Ti is further transformed into a novelty non-oxide phase, TiCN. The transformation process can be expressed as follows: Al3Ti reacts with C and other carbides (Al4C3 and Al4O4C) to form TiCx (x < 1). As the firing temperature increases, Al3Ti transforms into a liquid phase and produces Ti(g) and TiO(g). Finally, Ti(g) and TiO(g) are nitrided and solid-dissolved into the TiCx crystals to form a TiCN solid solution.
Keywordsaluminum titanium oxide alloys titanium carbonitride
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Authors acknowledge the financial support from the National Natural Science Foundation of China (No. 51872023).
- C.A. Qiu and R. Metselaar, Thermodynamic evaluation of the Al2O3-Al4C3 system and stability of Al-oxycarbides, Z. Metallkd., 86(1995), No. 3, p. 198.Google Scholar
- M. Sujata, S. Bhargava, and S. Sangal. On the formation of TiAl3 during reaction between solid Ti and liquid Al, J. Mater. Sci. Lett., 16(1997), No. 13, p. 1175.Google Scholar
- M.W. Chase Jr, NIST-JANAF Thermochemical Tables, 4th ed., American Chemical Society and the American Institute of Physics for the National Institute of Standards and Technology, Washington DC, 1998.Google Scholar