摘要
采用激光与等离子复合热源喷涂技术,在38CrMoAl基体上制备NiCr-Cr3C2涂层,对涂层的结合强度、显微硬度、微观组织结构以及抗高温滑动摩擦磨损性能等进行了测试分析.结果表明,与传统的等离子喷涂层相比,复合热源喷涂时,NiCr-Cr3C2粉末受热熔融更充分,流动性好,铺展均匀.涂层实现了冶金结合,具有更高的结合强度.涂层组织细化结构致密,无明显的孔洞和裂纹.这些显微组织结构上的变化使得复合喷涂NiCr-Cr3C2涂层具有更加优异的抗高温滑动摩擦磨损性能,其摩擦系数低且具有很好的稳定性.
The NiCr-Cr3C2 coating is deposited on the 38CrMoAl substrate by the LHPS(laser hybrid plasma spraying) technology,and the bonding strength,microhardness,microstructures and anti-high-temperature abrasion performance of the coating are tested and analyzed.The test results show that the LHPS NiCr-Cr3C2 coating achieves metallurgy bonding and has higher bonding strength than the plasma spraying coating.The laser power makes the NiCr-Cr3C2 powders melt more sufficiently and have good fluidity and uniformity.The LHPS NiCr-Cr3C2 coating has higher microhardness for its microstructure becomes thin and compact and there are no big cracks and cavities in it.For the changes of its microstructures and the improvements of its basic properties,the LHPS NiCr-Cr3C2 coating has more excellent anti-high-temperature abrasion performance and its friction coefficient is low and stable.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第4期95-98,118,共4页
Transactions of The China Welding Institution
