首页|Oxidation behavior of (NbTaZrW)C high-entropy carbide at 800–1000 °C
Oxidation behavior of (NbTaZrW)C high-entropy carbide at 800–1000 °C
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
? 2022 Elsevier Inc.To enrich the database of HECC oxidation and to assess the potential of the hard-and-tough (NbTaZrW)C for high temperature application in oxygen-containing environments, in the current study, the oxidation resistance and behavior of this W-incorporated high-entropy carbide ceramic (HECC) was evaluated and investigated. To achieve this end, isothermal oxidation tests were conducted in a temperature range of 800–1000 °C. Natures of the oxidation products were systematically characterized. The results show that, the oxidation of (NbTaZrW)C follows the parabolic rule, suggesting the abeyance of a diffusion-controlled oxidation process at 800–1000 °C. Mechanistically, the oxidation of (NbTaZrW)C is dominated by the inward diffusion of O2 with no sign of outward diffusion of cation-site metallic elements. Varying with temperature, a few compositionally complex oxides, including (Nb0.5Ta0.5)2Zr6O17, ((Nb0.5Ta0.5)2O5)15(WO3)2, (Nb0.5Ta0.5)16W18O94, as well as (NbTaZrW)Ox with unknown structure. During oxidation, laminated structures with inter-laminate cracks tend to form due to the combined effects from residual stress and gaseous products. Our final comparison shows that, (NbTaZrW)C exhibits significantly lower oxidation resistance than a few other HECCs, such as (HfTaZrNb)C and (HfZrTaNbTi)C. The low oxidation resistance, as quantified by the extremely high kp values, of (NbTaZrW)C suggest its unsuitability for application in high temperature oxygen-containing environment.
High-entropy carbideOxidation resistanceUltra-high temperature ceramicsW-incorporated oxide
Chen H.、Wang L.、He L.、Li Z.、Yan H.、Peng F.、Wu Z.、Ma Y.、Yang T.
展开 >
College of Mechanical Engineering Zhejiang University of Technology
College of Materials Science and Engineering Hunan University
Key Laboratory for Light-weight Materials Nanjing Tech University
Department of Mechanical Engineering City University of Hong Kong
NSTL
Elsevier
