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Oxidation Mechanism of Nb–Si-Based Ultra-High Temperature Materials

  • Fengwei GuoEmail author
  • Yongwang Kang
  • Chenbo Xiao
  • Ming Li
  • Meiling Wu
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 217)

Abstract

The oxidation behavior of Nb–Si-based alloy (Nb–20Ti–16Si–3Cr–3Al–2Hf, at%) at 1250 °C in air was investigated. Severe selective oxidation occurred in the alloy, which mainly took place in Nb solid solution and accompanied with large amount of precipitations of Ti-rich oxide. External oxidation of Nb solid solution was the selective oxidation, composed of two steps of solid-phase reaction among the oxides. The morphology of oxide-scale layers varied since the solid-phase reaction between the oxides, and it became porous and multilayer finally. TiNb2O7, Ti2Nb10O29, SiO2, and TiO2 were the main phase constitutions of the oxide layer which were rich in Ti2Nb10O29 in inner oxide-scale layer and TiNb2O7 in outer oxide-scale layer. The protection efficiency of the oxide-scale layer for the Nb–Si-based alloy at high temperature was weak. The weight gain during the beginning oxidation stage fitted the linear oxidation law with the rate of about 6 mg/(cm2 h).

Keywords

Nb–Si High-temperature oxidation Selective oxidation Solid-phase reaction of oxides 

Notes

Acknowledgements

This work was supported by National Key R&D Program of China (No. 2017YFB0702904) and National Natural Science Foundation of China (No. 51601183).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Fengwei Guo
    • 1
    Email author
  • Yongwang Kang
    • 1
  • Chenbo Xiao
    • 1
  • Ming Li
    • 1
  • Meiling Wu
    • 1
  1. 1.Science & Technology on Advanced High Temperature Structural Materials LaboratoryAECC Beijing Institute of Aeronautical MaterialsBeijingChina

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