沉积电压对SiC-C/C复合材料表面水热电泳沉积SiCn-MoSi2复合抗氧化涂层的影响

doi:10.3724/SP.J.1077.2010.01291

无机材料学报 ›› 2010, Vol. 25 ›› Issue (12): 1291-1297.DOI: 10.3724/SP.J.1077.2010.01291

沉积电压对SiC-C/C复合材料表面水热电泳沉积SiC_n-MoSi₂复合抗氧化涂层的影响

王博, 黄剑锋, 刘淼, 曹丽云, 吴建鹏

(教育部轻化工助剂化学与技术重点实验室, 陕西科技大学, 西安 710021)

收稿日期:2010-03-23 修回日期:2010-05-10 出版日期:2010-12-20 网络出版日期:2010-11-24
基金资助:
国家自然科学基金(50772063); 教育部博士点基金(20070708001); 新世纪优秀人才支持计划(NCET-06-0893); 陕西
科技大学科研创新团队基金(TD09-05); 陕西科技大学研究生创新基金

Influence of Deposition Voltage on the SiC_n-MoSi₂Coating for C/C Composites Prepared by a Hydrothermal Electrophoretic Deposition Process

WANG Bo, HUANG Jian-Feng, LIU Miao, CAO Li-Yun, WU Jian-Peng

(Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology, Xi’an 710021, China)

Received:2010-03-23 Revised:2010-05-10 Published:2010-12-20 Online:2010-11-24
Supported by:
National Natural Science Foundation of China (50772063); Doctorate Foundation of Ministry of Education in China
(20070708001); Program for New Century Excellent Talents in University (NCET-06-0893); Research Team Innovation Foundation of SUST (TD09-05); Graduate Innovation Foundation of SUST

摘要/Abstract

摘要： 采用水热电泳沉积法在SiC-C/C复合材料表面制备纳米碳化硅和二硅化钼的复相(SiCn-MoSi₂)抗氧化涂层.分别采用XRD和SEM等测试手段对涂层的晶相组成和显微结构进行了表征. 主要研究了沉积电压对涂层显微结构及高温抗氧化性能的影响, 分析了涂层试样在1500℃下的静态氧化行为及热循环失效机理. 结果表明: 外涂层主要由MoSi₂和β-SiC晶相组成. 当沉积电压为100~180V时, 外涂层的致密程度、厚度及抗氧化性能随着沉积电压的升高而提高. 沉积电压过高(220V)时, 复合涂层中出现裂纹等缺陷, 涂层的氧化保护能力相应减弱. 抗氧化性能测试表明复合涂层可在1500℃的静态空气中有效保护C/C复合材料346h, 失重率仅1.41wt%. 涂层的高温失效是由于涂层试样在热循环过程中产生了贯穿性裂纹导致的.

关键词: C/C复合材料, 复合涂层, 水热电泳沉积, 沉积电压

Abstract: In order to protect carbon/carbon (C/C) composites from oxidation at high temperature, a nano SiC_n-MoSi₂ coating was prepared on SiC pre-coated C/C composites by novel hydrothermal electrophoretic deposition. The phase compositions of the as-prepared coatings were analyzed by XRD, the morphologies of the multi-layer coatings were observed by SEM and the high temperature anti-oxidation properties of the multi-coatings were investigated by isothermal oxidation test. The influence of hydrothermal electrophoretic deposition voltage on the phase composition, microstructure and high temperature oxidation resistance of the multilayer coating were particularly investigated. The invalidation behavior of the coated sample during the thermal cycle process was analyzed. Results show that the outer layer coatings are mainly composed of β-SiC and MoSi₂ phases. The thickness, density and anti-oxidation properties of the SiC_n-MoSi₂ coating are improved with the increase of deposition voltage from 100V to 180V. However, cracks are observed at a high deposition voltage (220V) and the decrease in oxidation resistance is detected. The multi-layer coatings deposited at 180V exhibit excellent oxidation resistance ability, which can effectively protect C/C composites from oxidation in air at 1500℃ for 346h with a weight loss of 1.41%. The failure of the coating after 80 thermal cycles between 1500℃ and room temperature is due to the generation of cross-cracks in the coating during the test.

Key words: carbon/carbon composites, multilayer coating, hydrothermal electrophoretic deposition, deposition voltage

中图分类号:

TB332

王博, 黄剑锋, 刘淼, 曹丽云, 吴建鹏. 沉积电压对SiC-C/C复合材料表面水热电泳沉积SiC_n-MoSi₂复合抗氧化涂层的影响[J]. 无机材料学报, 2010, 25(12): 1291-1297.

WANG Bo, HUANG Jian-Feng, LIU Miao, CAO Li-Yun, WU Jian-Peng. Influence of Deposition Voltage on the SiC_n-MoSi₂Coating for C/C Composites Prepared by a Hydrothermal Electrophoretic Deposition Process[J]. Journal of Inorganic Materials, 2010, 25(12): 1291-1297.

参考文献

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沉积电压对SiC-C/C复合材料表面水热电泳沉积SiC_n-MoSi₂复合抗氧化涂层的影响

Influence of Deposition Voltage on the SiC_n-MoSi₂Coating for C/C Composites Prepared by a Hydrothermal Electrophoretic Deposition Process

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