Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (6): 660-666.DOI: 10.15541/jim20180395

Previous Articles     Next Articles

Simulation of ZrB2 Oxidation Behavior at Constant Temperature Ambient

Shu-Guang ZHOU1,2,Yi-Jun GUO2(),Xiao LIU2   

  1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
    2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2018-08-28 Revised:2018-11-23 Published:2019-06-20 Online:2019-05-23
  • Supported by:
    National Program on Key Basic Research Project Study on Key Basic Problems of Aerodynamics and Flight Control Covering Flow Regimes for Aerospace Craft((2014CB744100))

Abstract:

Zirconium diboride (ZrB2), a thermal protection material for hypersonic vehicle, has received widespread attention in recent years. Here we advance an oxidation model based on oxidation products (ZrO2 and B2O3) and their morphology at different temperatures to simulate the oxidation behavior of ZrB2. This study further establishes the dynamic equilibrium among formation, evaporation and supplement of B2O3 whose concentration at ambient was assumed to be nonzero. Research results indicate that the advanced model can predict the oxidation behavior of ZrB2 under quasi-static low flow conditions and the simulation results are consistent with the data obtained from sample suspended in wire heater furnace at constant temperature. The porosity has a great influence on the oxidation process, and at the same temperature and oxygen partial pressure, the larger the porosity, the higher the oxidation degree. The oxidation rate controlled by diffusion in the presence of liquid B2O3 film laying outer surface of substrate reduces greatly and the material exhibits the strongest oxidation resistance.

Key words: zirconium diboride, oxidation behavior, pore fraction, simulation, film

CLC Number: