Electrospark deposition of Al2O3–TiB2/Ni composite-phase surface coatings on Cu–Cr–Zr alloy electrodes
| Autor: | Ping Luo, Zhong Zheng, Shixuan Sun, Shijie Dong, Wang Huihu, Anzhuo Yangli |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Materials science
Scanning electron microscope Composite number Clay industries. Ceramics. Glass Copper alloy electrode 02 engineering and technology engineering.material 01 natural sciences Indentation hardness symbols.namesake Coating 0103 physical sciences 010302 applied physics Aluminum oxide–titanium diboride Metallurgy 021001 nanoscience & nanotechnology Microstructure Galvanization TP785-869 Electrode Ceramics and Composites engineering symbols 0210 nano-technology Electrospark deposition |
| Zdroj: | Journal of Asian Ceramic Societies, Vol 3, Iss 1, Pp 103-107 (2015) |
| ISSN: | 2187-0764 |
| DOI: | 10.1016/j.jascer.2014.11.005 |
| Popis: | To improve electrode life during the resistance spot welding of galvanized steel plates, an Al 2 O 3 –TiB 2 composite coating was synthesized on the surfaces of spot-welding electrodes through an electrospark deposition process. The microstructure, elemental composition, phase structure, and mechanical properties of the coating were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, and microhardness testing. It was found that extensive cracking occurred in the monolithic Al 2 O 3 –TiB 2 coating and at the coating–electrode interface. When the Al 2 O 3 –TiB 2 coating was deposited on electrodes precoated with Ni, the number of defects decreased significantly. Further, delamination did not occur, and fewer cracks were formed. The average hardness of the multilayered Al 2 O 3 –TiB 2 /Ni coating was approximately 2200 HV and higher than that of the monolithic Al 2 O 3 –TiB 2 coating (1100 HV). |
| Databáze: | OpenAIRE |
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