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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第6期    总第196期    2010年12月

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文章编号:1672-7207(2010)06-2122-05
悬浮液粉体质量浓度对C-AlPO4高温抗氧化涂层
结构和性能的影响
杨文冬,黄剑锋,曹丽云,夏昌奎

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

摘 要: 以方石英型磷酸铝(C-AlPO4)粉体为原料,异丙醇为溶剂,碘为荷电介质,在不同悬浮液粉体质量浓度条件下采用水热电泳沉积的方法在C/C-SiC复合材料表面制备高温C-AlPO4抗氧化涂层。借助XRD和SEM对涂层的晶相组成和显微结构进行表征,通过黏结-拉伸实验测定涂层与基体的结合强度和涂层的抗氧化性能。研究结果表明:悬浮液粉体质量浓度对涂层的显微结构、涂层与基体的结合力和涂层的抗氧化性能有较大的影响;涂层中C-AlPO4晶相的结晶程度随着悬浮液粉体质量浓度的升高而提高;增加悬浮液的粉体质量浓度有利于获得表面致密、厚度均匀且结合力好的涂层;不同悬浮液载荷下涂层的沉积量与时间呈线性关系;涂层试样的抗氧化性能随悬浮液粉体质量浓度的增加而提高。

 

关键字: 磷酸铝;碳/碳复合材料;水热电泳沉积;涂层;氧化

Effects of suspension powder content on structure and properties of cristobalite aluminum phosphate high temperature oxidation protective coatings
YANG Wen-dong, HUANG Jian-feng, CAO Li-yun, XIA Chang-kui

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

Abstract:Cristobalite aluminum phosphate high temperature oxidation protective coatings were deposited on C/C-SiC composites by a novel hydrothermal electrophoretic deposition process in suspensions with different powder contents using cristobalite aluminum phosphate crystallites, isopropanol and iodine as source materials, solvent and charging agent, respectively. The surface and cross-section morphologies and phase composition of the as-prepared coatings were characterized by scanning electronic microscopy (SEM) and X-ray diffraction (XRD). The bonding strength between the coating and substrate was tested by a shear strength testing experiment. Oxidation resistance of the cristobalite aluminum phosphate coatings was tested. The results show that suspension powder content has a significant effect on the microstructure and the bonding strength between the coating and substrate, further on its antioxidation property. The crystallization of cristobalite aluminum phosphate particles, thickness and density of the as-prepared coatings are improved with the increase of suspension powder content. The deposition amount and bonding strength of the cristobalite aluminum phosphate coatings also increase with the increase of suspension powder content. The deposition mass per unit area of the coatings and the deposition time at different suspension powder contents satisfy linear relationship. The antioxidation property of the coated C/C composites improves with the increase of suspension powder content.

 

Key words: aluminum phosphate; carbon/carbon composites; hydrothermal electrophoretic deposition; coatings; oxidation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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