氮化硼含量对热化学反应法制得陶瓷涂层耐高温氯腐蚀性能的影响
Effect of BN Content on High Temperature Chlorine Corrosion Resistance of Ceramic Coating Prepared by Thermochemical Reaction Method
初希 1俞卫新 1徐应根 2代真 1胡树森 1王平3
作者信息
- 1. 中电华创电力技术研究有限公司,苏州 215123
- 2. 中电国际新能源海南有限公司,海口 571924
- 3. 合肥科德电力表面技术有限公司,合肥 230081
- 折叠
摘要
采用热化学反应法以复合磷酸盐为黏接剂,在 Q235 钢基体上制备了不同氮化硼(BN)含量的氧化铝基陶瓷涂层;运用扫描电子显微镜和X射线衍射仪研究了BN含量对热化学反应陶瓷涂层形貌和组织结构、热膨胀系数和耐高温氯腐蚀性能的影响.结果表明:热化学反应涂层与基体反应产生了新相Al0.67Fe0.33PO4,随着陶瓷涂层中 BN 含量的增加,涂层表面的裂纹和孔隙先减少后增加,30%BN-Al2O3 和 50%BN-Al2O3 陶瓷涂层的热膨胀系数分别为 7.9×10-6 和 7.7×10-6,与基体材料 Q235 的较为接近;热化学反应涂层显著改善了 Q235 钢的耐高温氯腐蚀性能,其中 50%BN-Al2O3 陶瓷涂层的耐高温氯腐蚀性能最好.
Abstract
Alumina-based ceramic coatings with different content of boron nitride(BN)were prepared on Q235 substrate using a thermochemical reaction method and composite phosphate as the adhesive.The effects of BN content on the morphology and microstructure,thermal expansion coefficient,and high-temperature chloride corrosion resistance of thermochemical reactive ceramic coatings were studied using scanning electron microscopy and X-ray diffraction.The results indicate that a new phase of Al0.67Fe0.33Po4 was formed by the reaction between the thermochemical reaction coating and the substrate.As the BN content in ceramic coatings increased,the cracks and pores on the coating surface first decreased and then increased.The thermal expansion coefficients of 30%BN-Al2O3 and 50%BN-Al2O3 ceramic coatings were 7.9×10-6 and 7.7×10-6 respectively,which were relatively close to the matrix material Q235.Ceramic coatings significantly improved the high temperature chlorine corrosion resistance of Q235 steel,and 50%BN-Al2O3 ceramic coating had the best high temperature chlorine corrosion resistance.
关键词
热化学反应/氮化硼/高温氯腐蚀/磷酸铝/陶瓷涂层Key words
thermochemical reaction/boron nitride/high temperature chlorine corrosion/aluminum phosphate/ceramic coating引用本文复制引用
出版年
2024
NETL
NSTL
万方数据