Preparation and anti-oxidation characteristics of ZrSiO4-SiBCN(O) amorphous coating

In this paper, a dense and seamless SiBCN(O) amorphous coating with a few ZrSiO4 particles is prepared by low-cost slurry method and sintered at 1573 K, namely ZrSiO4-SiBCN(O) amorphous coating. During its preparation process, by employing the polyborosilazane (PBSZ)-ethanol solution as the precursor, the sintering temperature of the coating is significantly reduced and its densification is greatly improved as well. The coating was heat-treated in stagnant laboratory air at 1773 K from 5 min to 8 h. It shows high oxidation protecting performance during oxidation and the oxidation mechanism includes three stages, that are active oxidation, defection healing and oxygen diffusion at 1773 K. It was also found that, by introducing the ZrSiO4 particles into the SiBCN(O) amorphous coating, the propagation of micro-cracks during its oxidation process is prominently inhibited. (C) 2015 Elsevier B.V. All rights reserved.