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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

C/C复合材料表面水热电泳沉积SiCn/SiC复合抗氧化涂层研究

刘 淼, 黄剑锋, 王 博, 曹丽云, 吴建鹏   

  1. （陕西科技大学 教育部轻化工助剂化学与技术重点实验室, 西安 710021）
  • 收稿日期:2009-03-16 修回日期:2009-05-14 出版日期:2009-11-20 网络出版日期:2010-04-22

SiCn/SiC Multilayer Oxidation Protective Coatings for C/C Composites
Prepared by a Hydrothermal Electrophoretic Deposition Process

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

  1. (Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China)
  • Received:2009-03-16 Revised:2009-05-14 Published:2009-11-20 Online:2010-04-22

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被引次数

1

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（SiCn）涂层. 采用XRD和SEM对涂层的晶相组成、表面和断面的微观结构进行了表征. 主要研究了水热沉积温度对涂层的结构及高温抗氧化性能的影响, 并分析了涂层试样在1600℃的高温氧化气氛下失效行为. 结果表明：纳米碳化硅涂层主要由β-SiC组成. 涂层的致密程度和厚度随着水热沉积温度的升高而提高. 随着水热温度的提高, 涂层试样的抗氧化性能也有明显的提高. 在120℃水热沉积温度下制备的涂层试样可在空气气氛1500℃下有效保护C/C复合材料202h，而氧化失重仅为2.16×10-3g/cm2. 在1600℃下氧化64h后失重为3.7×10-3g/cm2. 其高温失效是由于长时间的氧化挥发后表面SiO2膜不能完全封填表面缺陷, 内涂层中产生了贯穿性的孔隙所致.

关键词: C/C复合材料, 纳米碳化硅, 水热电泳沉积

Abstract: Nano-SiC coatings (SiCn) were deposited on SiC-C/C composites surface by a hydrothermal electrophoretic deposition. Phase compositions, surface and cross-section morphologies of the as-prepared multilayer coatings were characterized by XRD and SEM. The influences of hydrothermal deposition temperatures on the microstructures and high temperature oxidation resistance of the SiCn coatings were particularly investigated. And the invalidation behaviors of the as-prepared multilayer coatings coated samples at 1600℃ were analyzed. Results show that the as-prepared nano-SiC outer layers are composed of β-SiC. The thickness and density of the nano-SiC coatings improve with the increase of hydrothermal temperature. With the increase of hydrothermal temperature, the anti-oxidation properties of the coating samples increase. The prepared coating samples deposited at 120℃ can effectively protect C/C composites from oxidation at 1500℃ in air for 202h with weight loss only about 2.16×10-3g/cm2. While the weight loss of coated C/C composites after 64h oxidation at 1600℃ in air is 3.7×10-3g/cm2. The failure of the coatings is due to the long time volatilization of SiO2 thin film at high temperature, which makes the coating defects fail to be self-cured by SiO2 glass layer and form the penetrative microholes in the SiC bonding layer.

Key words: C/C composites, nano-SiC, hydrothermal electrophoretic deposition

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