期刊
MATERIALS & DESIGN
卷 81, 期 -, 页码 65-72出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.05.022
关键词
Self-propagating high-temperature synthesis (SHS); Microstructure Atmospheric plasma spraying (APS); Coating; ZrC-ZrB2
资金
- National Natural Science Foundations of China [51404157, 51101143, 51472235]
- Open Foundation of Zhejiang Provincial Key Laboratory for Cutting Tools [ZD201307, ZD201309]
Reaction behavior and microstructure of products in a Co-Zr-B4C system during self-propagating high-temperature synthesis (SHS) were investigated. With an increase in Co content, the combustion temperature decreased monotonically, the ignition delay time first decreased and then increased. The final products consisted of the major phases of ZrC and ZrB2 and minor phases of ZrCo3B2 and BCo2. The ZrCo3B2 was formed at the cooling stage of SHS due to the reaction between resultant ZrB2 and Co, which inevitably led to the presence of ZrCo3B2 in the products regardless of Co content, preheating and Zr/B4C mole ratio. The grain size of ZrC and ZrB2 particles decreased to less than 0.5 lm with Co content increasing to 40-50 wt.%. The in situ ZrC-ZrB2 ceramic composites powders synthesized by the SHS reactions in the Co-Zr-B4C system have attractive application in the wear resistant coatings. Magnesium alloy substrate was successfully plasma sprayed with the ZrC-ZrB2 ceramic composites coatings using the SHS synthesized powders. The produced coatings provided superior wear resistance for magnesium alloy substrate and bonded well with the substrate. (C) 2015 Elsevier Ltd. All rights reserved.
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