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Effect of operating voltage on microstructure and microhardness of NiCoCrAlYTa-Y2O3 composite coatings on single crystal superalloy produced by electrospark deposition
Wang, De; Wang, Wenqin; Wang, Mingsheng; Li, Yulong; Chen, Xingui; Chi, Changtai; Xie, Yujiang
2019-01-25
Source PublicationSURFACE & COATINGS TECHNOLOGY
ISSN0257-8972
Volume358Pages:628-636
AbstractNiCoCrAlTTa-Y2O3 metal matrix composite coatings were prepared on single crystal superalloy by electrospark deposition (ESD) to improve the wear- and oxidation resistance. The effect of operating voltage during ESD on the deposit morphology, coating growth kinetics, microstructure and properties was investigated. The results showed that, with increasing operating voltage, the dimension (both diameter and depth) of single-pulse deposit increased, leading to thinner deposit thickness, thus resulting in higher cooling rate, finer grains, stronger crystal orientation, and increasing microhardness. Whereas the motion of the molten deposit metal became more turbulent, giving rise to the defect of lack of fusion. However, the grain size increased obviously from bottom layer to top layer for 100 V condition, leading to decreasing microhardness. Meanwhile, the mass gain rate increased but the mass transfer coefficient decreased with the increase of operating voltage. The distribution pattern of Y2O3 particles changed during electrospark deposition, from gathering in the boundary between the powders in the electrode to distributing homogeneously in the whole coating, which contributed to the increase of coating microhardness.
KeywordElectrospark deposition Metal matrix composite coating Single crystal superalloy NiCoCrAlYTa Epitaxial growth
Indexed BySCI
Language英语
WOS IDWOS:000456762300074
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81436
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Wang, De,Wang, Wenqin,Wang, Mingsheng,et al. Effect of operating voltage on microstructure and microhardness of NiCoCrAlYTa-Y2O3 composite coatings on single crystal superalloy produced by electrospark deposition[J]. SURFACE & COATINGS TECHNOLOGY,2019,358:628-636.
APA Wang, De.,Wang, Wenqin.,Wang, Mingsheng.,Li, Yulong.,Chen, Xingui.,...&Xie, Yujiang.(2019).Effect of operating voltage on microstructure and microhardness of NiCoCrAlYTa-Y2O3 composite coatings on single crystal superalloy produced by electrospark deposition.SURFACE & COATINGS TECHNOLOGY,358,628-636.
MLA Wang, De,et al."Effect of operating voltage on microstructure and microhardness of NiCoCrAlYTa-Y2O3 composite coatings on single crystal superalloy produced by electrospark deposition".SURFACE & COATINGS TECHNOLOGY 358(2019):628-636.
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