期刊
SURFACE ENGINEERING
卷 33, 期 1, 页码 72-82出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670844.2016.1258769
关键词
Nanostructure; Coatings; HVOF spraying; Heat treatment; Abrasive wear
资金
- Alberta Innovates Canada (nanoWorks Collaborative program)
- Government of Libya
This study investigates the effect of heat treatment on changes in microstructure and wear behaviour of WC-NiCr coatings. Two feedstock powders with a similar chemical composition and different particle sizes (near nano-structured WC-17NiCr and microstructured WC-15NiCr) were used. High-velocity oxyfuel spraying technique was used to deposit coatings on to a mild steel substrate using identical spraying parameters. Coated samples were then heat treated in a nitrogen atmosphere at 500 and 700 degrees C. The effect of heat treatment on changes in hardness and wear performance of the coatings was studied using microstructural analysis, micro-hardness indentation and abrasive wear tests. The results showed that the heat treatment increased the hardness of both coatings and a corresponding increase in wear resistance was recorded. The formation of a brittle CrWO4 phase in the microstructured coating resulted in brittle fracture of the coating and this gave lower wear resistance compared to the nanostructured coatings.
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