Low-Temperature Oxidation Behavior of (Zr1/3Nb1/3Ti1/3)C Solid-Solution Ceramics in Air [(Zr1/3Nb1/3Ti1/3)C固溶体陶瓷的低温氧化行为研究]

作者：Ye B.; Wen T.; Chu Y.^*

来源：Materials China, 2020, 39(12): 918-923.

DOI：10.7502/j.issn.1674-3962.202004021

• Carbides
• Microstructure
• Oxidation
• Solid solutions
• Ultra-high temperature ceramics

In order to investigate the low-temperature oxidation behavior of the ternary carbide solid-solution ceramics, the low-temperature oxidation behavior of (Zr1/3Nb1/3Ti1/3)C (ZNTC) solid-solution ceramics was investigated by the isothermal-exposure oxidation test at 1073~1473 K in air for 120 minutes. The results showed that ZNTC samples possessed good low-temperature oxidation resistance and their oxidation process could be described by a parabolic rate law. As oxidation temperature increasing from 1073 to 1473 K, the calculated parabolic rate of ZNTC decreased slowly from 1073 to 1173 K, then increased rapidly from 1173 to 1273 K, and finally decreased gradually from 1273 to 1473 K. This behavior was primarily attributed to the evolution of the composition and microstructure in the oxide layers. Specifically, the oxidation products were mainly composed of ZrO2, Nb2O5, and TiO2 at 1073~1173 K, and then transformed into the composition of ZrTiO4, TiNb2O7, and Nb2Zr6O17 at 1273~1473 K. In addition, in the view of surface and cross-section, the morphology feature of oxidation products changed with the oxidation temperature.

• 单位
  华南理工大学