高温扩散对超音速火焰喷涂NiCrBSi结晶器涂层组织与性能的影响
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摘要
为提高超音速火焰喷涂Ni Cr BSi结晶器涂层的质量和使用性能,对喷涂后的涂层分别进行1000、1020、1040、1060℃的真空高温扩散处理,使用电子探针、扫描电镜和激光热导仪等仪器分析了涂层在扩散前后的组织和性能变化。结果表明:高温扩散对涂层的微观结构、显微硬度、摩擦磨损性能以及导热性能等都有一定影响。在经过1000℃以上的高温扩散之后,喷涂涂层的层状结构消失,组织缺陷减少,孔隙率降低。涂层的显微硬度下降,但硬度分布更为均匀。扩散之后涂层的耐磨性能提高,且在扩散温度为1020℃时提升效果最好。另外,高温扩散后涂层的导热系数明显提高,导热能力增强。
To improve the quality and properties of HVOF sprayed Ni Cr BSi mold coating,the vacuum high temperature diffusion was carried out at 1000,1020,1040 and 1060 ℃ respectively. The microstructure and properties of the coating before and after diffusion were studied by means of electron probe,scanning electron microscope( SEM) and laser thermal conductivity instrument. The results show that the thermal diffusivity has a certain effect on the microstructure,micro hardness,wear resistance and thermal conductivity of the coating. After high temperature diffusion over 1000 ℃,the lamellar structure of the sprayed coating disappears,and the microstructure defects decreases. The micro hardness of the coating decreases,but the hardness distribution becomes uniform. After diffusion,the wear resistance of the coating is improved,and the best effect is achieved when diffusion treated at 1020 ℃. In addition,the thermal conductivity of the coating is improved significantly after high temperature diffusion.
To improve the quality and properties of HVOF sprayed Ni Cr BSi mold coating,the vacuum high temperature diffusion was carried out at 1000,1020,1040 and 1060 ℃ respectively. The microstructure and properties of the coating before and after diffusion were studied by means of electron probe,scanning electron microscope( SEM) and laser thermal conductivity instrument. The results show that the thermal diffusivity has a certain effect on the microstructure,micro hardness,wear resistance and thermal conductivity of the coating. After high temperature diffusion over 1000 ℃,the lamellar structure of the sprayed coating disappears,and the microstructure defects decreases. The micro hardness of the coating decreases,but the hardness distribution becomes uniform. After diffusion,the wear resistance of the coating is improved,and the best effect is achieved when diffusion treated at 1020 ℃. In addition,the thermal conductivity of the coating is improved significantly after high temperature diffusion.
引文
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[3]岳灿甫.连铸结晶器铜板及表面处理技术进展[J].材料开发与应用,2011,26(4):56-58.Yue Canfu. Progress of copper plate and surface treatment technology for continuous casting mould[J]. Development and Application of Materials,2011,26(4):56-58.
[4]钱明,姚书典.连铸结晶器铜板的现状与发展趋势[J].冶金设备,2008(6):62-66.Qian Ming,Yao Shudian. Current situation and tendency on progress of copper plates mould in continuous casting[J]. Metallurgical Equipment,2008(6):62-66.
[5]张伟,李喜月.结晶器铜板表面修复技术综述[J].工程技术(全文版),2016,27:269.
[6]Bergant Z, Grum J. Quality improvement of flame sprayed, heat treated,and remelted Ni CrBSi coatings[J]. Journal of Thermal Spray Technology,2009,18(3):380-391.
[7]Liu Liming,Xu Haifeng,Xiao Jinkum,et al. Effect of heat treatment on structure and property evolutions of atmospheric plasma sprayed Ni CrBSi coatings[J]. Surface and Coatings Technology,2017,325:548-554.
[8]陈忠,张世宏,陈默含.超音速火焰喷涂结晶器铜板Ni60A涂层真空退火研究[J].热加工工艺,2015,44(6):133-135.Chen Zhong, Zhang Shihong, Chen Mohan. Research on vacuum annealing of HVOF sprayed crystallizer copper Ni60A coating[J]. Hot Workong Technology,2015,44(6):133-135.
[9]田立辉,毛淑滑,芦笙,等.等离子喷涂-重熔Ni CrBSi涂层的显微组织与耐磨性能[J].焊接学报,2016,37(6):92-94.Tian Lihui,Mao Shuhua,Lu Sheng,et al. Microstructure and wearresistance of Ni CrBSi coating sprayed-remelted by plasma process[J].Transactions of China Welding Institution,2016,37(6):92-94.
[10]Yaran Niu,Xuebin Zheng. Microstructure and thermal property of tungsten coatings prepared by vacuum plasma spraying technology[J].Fusion Engineering and Design,2010(85):1521-1526.
[11]付翀,刘宁,张宇慧,等.真空退火对等离子喷涂Ag/Sn O2涂层组织和性能的影响[J].金属热处理,2016,41(6):128-130.Fu Chong, Liu Ning, Zhang Yuhui, et al. Influence of vacuum annealing on microstructure and properties of plasma sprayed Ag/SnO2coating[J]. Heat Treatment of Metals,2016,41(6):128-130.
[12]Bharat Bhushan. Introduction to Tribology[M].北京:机械工业出版社,2006:182-195.
[13]牛永辉.结晶器CuCrZr铜板表面超音速等离子喷涂Cr2O3涂层的组织与性能[D].西安:西安建筑大学,2015:30-36.
[14]李国斌,崔红.流体力学与热工基础[M].北京:北京理工大学出版社,2016:126-128.