Characterisations of plasma sprayed and laser remelted NiCrAlY bond coats and Ni3Al coatings on boiler tube steels
Characterisations of plasma sprayed and laser remelted NiCrAlY bond coats and Ni3Al coatings on boiler tube steels
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DOI：
10.1016/j.msea.2003.10.281
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发表时间：
2004-03
期刊：
影响因子：
6.4
通讯作者：
B. S. Sidhu;D. Puri;S. Prakash
中科院分区：
文献类型：
--
作者：
B. S. Sidhu;D. Puri;S. Prakash
采用包覆等离子喷涂技术在锅炉管钢ASTM-SA210-A1、ASTM-SA213-T-11和ASTM-SA213-T-22上获得了NiCrAlY和Ni3Al涂层。在应用Ni3Al涂层之前，NiCrAlY也被用作粘结层。对涂层进行了金相、X射线和扫描电子显微镜/能谱分析。沿截面测量了涂层的显微硬度。对于NiCrAlY粘结层，激光重熔后硬度值显著降低。由于原子间的相互扩散，激光重熔导致了涂层的显著稀释。激光熔覆层获得了致密均匀的组织。
NiCrAlY and Ni3Al coatings were obtained on boiler tube steels namely ASTM-SA210-Grade A1, ASTM-SA213-T-11 and ASTM-SA213-T-22 through shrouded plasma spray process. NiCrAlY was also used as a bond coat before applying Ni3Al coatings. The coatings were subjected to metallography, XRD and SEM/EDAX analysis. The microhardness of the coatings has been measured along the cross-section. Considerable reduction in the hardness values has been observed after laser remelting in case of NiCrAlY bond coats. The laser remelting has resulted in significant dilution of coating due to inter diffusion of atoms. Very dense and homogeneous structures have been obtained by laser remelting of coatings.