Microstructure and growth behavior of Hf(Ta)C ceramic coating synthesized by low pressure chemical vapor deposition

被引:24
作者
Li, Zehao [1 ]
Wang, Yalei [1 ]
Xiong, Xiang [1 ]
Li, Xiaobin [2 ]
Chen, Zhaoke [1 ]
Sun, Wei [1 ]
机构
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
[2] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China
关键词
XRD; TEM; Microstructure; Growth behavior; Hf(Ta)C coating; CARBON-CARBON COMPOSITES; CARBON/CARBON COMPOSITES; ABLATION BEHAVIOR; HFC; TAC; FLAME;
D O I
10.1016/j.jallcom.2017.02.101
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hf(Ta)C ceramic coating was synthesized on graphite by low pressure chemical vapor deposition with gaseous mixtures of hafnium halide, tantalum halide, methane, hydrogen and argon. The phase composition and microstructure of as-prepared coating were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscope (TEM). The growth behavior of coating was also discussed. Results show that the as-prepared coating is composed of nano-sized Hf0.7Ta0.3C solid solution and rare of carbon. The Hf(Ta) C coating exhibits a nanocomposite structure with Hf0.7Ta0.3C grains embedding in amorphous carbon, which can be contributed to the rapid nucleation of Hf1-xTaxC, as well as the inhibition of carbon in the growth of Hf1-xTaxC grains. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:79 / 88
页数:10
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