Effect of heating-cooling rates on microstructure evolution of ZrB2-based coatings during oxidation. Issue 15 (December 2019)

• Record Type: Journal Article
• Authors: Li, Chong; Niu, Yaran; Zhong, Xin; Liu, Tao; Pan, Xiaohui; Shi, Minhao; Zheng, Xuebin; Ding, Chuanxian
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 15(2019)
• Page Start: 4565
• Page End: 4574
• Publication Date: 2019-12
• Subjects: ZrB2-based composite coatings -- Heating-cooling rates -- Microstructure -- Oxidation; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.07.015
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In this work, the influence of heating-cooling rates on the microstructure of ultra-high temperature ceramics (UHTCs) during oxidation was firstly reported. Four different kinds of processes (low-heating and low-cooling rates, low-heating and high-cooling rates, high-heating and low-cooling rates, high-heating and high-cooling rates) combined with static oxidation at 1500 °C were applied on ZrB2 -SiC-WB composite coatings. The results showed that the oxide layers of the samples presented different microstructure characters under different heating-cooling modes. A relatively thick liquid layer with obvious bubble phenomenon was generated under the high-heating rate, while a thin liquid layer without bubbles was formed under the low-heating rate. Certain amount of sheet B2 O3 crystals with large sizes were formed under the high-cooling rate, while did not for the low-cooling rate. The formation mechanisms of these unique microstructures were analyzed and the influence of heating and cooling rates was explained.