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

  • Yang Sun
  • Yong LiEmail author
  • Li-xin Zhang
  • Shi-ming Li
  • Ming-wei Yan
  • Jia-lin Sun
Article
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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 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.

Keywords

aluminum titanium oxide alloys titanium carbonitride 

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Acknowledgements

Authors acknowledge the financial support from the National Natural Science Foundation of China (No. 51872023).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yang Sun
    • 1
  • Yong Li
    • 1
    Email author
  • Li-xin Zhang
    • 2
  • Shi-ming Li
    • 3
  • Ming-wei Yan
    • 1
  • Jia-lin Sun
    • 1
  1. 1.School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Sinosteel Refractory Co. Ltd.HenanChina
  3. 3.Beijing Cisri-nmt Environmental Science and Technology Co. Ltd.BeijingChina

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