Novelty phase synthesis mechanism and morphology in resin-bonded Al-Al2O3-TiO2 composites at high temperatures under flowing N2

Yang Sun; Yong Li; Li-xin Zhang; Shi-ming Li; Ming-wei Yan; Jia-lin Sun

doi:10.1007/s12613-019-1829-2

Volume 26 Issue 9

Sep. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(9): 1177-1185

Yang Sun, Yong Li, Li-xin Zhang, Shi-ming Li, Ming-wei Yan, and Jia-lin Sun, Novelty phase synthesis mechanism and morphology in resin-bonded Al-Al₂O₃-TiO₂ composites at high temperatures under flowing N₂, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1177-1185. https://doi.org/10.1007/s12613-019-1829-2

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Yang Sun, Yong Li, Li-xin Zhang, Shi-ming Li, Ming-wei Yan, and Jia-lin Sun, Novelty phase synthesis mechanism and morphology in resin-bonded Al-Al2O3-TiO2 composites at high temperatures under flowing N2, Int. J. Miner. Metall. Mater., 26(2019), No. 9, pp. 1177-1185. https://doi.org/10.1007/s12613-019-1829-2

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Research Article

Novelty phase synthesis mechanism and morphology in resin-bonded Al-Al₂O₃-TiO₂ composites at high temperatures under flowing N₂

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Corresponding author:
Yong Li E-mail: lirefractory@vip.sina.com
Received: 15 December 2018; Revised: 12 March 2019; Accepted: 17 March 2019

Abstract

Abstract

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 TiC_x (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 TiC_x crystals to form a TiCN solid solution.
- aluminum;
- titanium oxide;
- alloys;
- titanium carbonitride

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References

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