纳米金属涂层对模具钢性能的影响分析  

Effect Analysis of Nano-metal Coating for Properties of Die Steel

作　　者：吴新梁 孙初锋[1] 

机构地区：[1]西北民族大学化工学院,甘肃兰州730124

出　　处：《热加工工艺》2014年第6期137-139,142,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51167017)

摘　　要：在4Cr5MoSiV1模具钢表面进行大气等离子喷涂纳米钨粉或纳米铬粉,并进行了高温硬度、耐热磨损性能和耐热疲劳性能的测试与分析。结果表明,大气等离子喷涂纳米钨粉或纳米铬粉,可有效提高模具钢的高温硬度、耐热磨损性能和耐热疲劳性能。优选为大气等离子喷涂纳米钨和纳米铬的混合粉末,其中纳米铬粉:纳米钨粉=2∶1。喷涂混合纳米粉后的试样在300℃时的硬度从202 HV增加到2042 HV;900℃摩擦磨损时的体积磨损率从1.91%减小到0.17%,热疲劳主裂纹级别从9级降至1级。Nano-tungsten or nano-chromium was spayed on the surface of 4Cr5MoSiV1 die steel by air plasma spraying, and hardness at high temperature, then, the thermal wear resistance and thermal fatigue resistance were tested. The results show that nano-tungsten or nano-chromium treated by air plasma spraying can improve efficiently the hardness at high temperature, thermal wear resistance and thermal fatigue resistance of die steel. The preference method is spraying the composite powder ofnano-tungsten and nano-chromium, and the ratio of nano-chromium to nano-tungsten is two to one. The hardness at 300℃ of the sample sprayed composite nano powder increases from 202 I-IV to 2042 HV, wear volume loss at 900℃ decreases from 1.91% to 0.17%, and the grade of lead thermal fatigue crack decreases from 9 to 1.

关 键 词：模具钢 纳米金属涂层 性能 纳米钨 纳米铬 

分 类 号：TG174[金属学及工艺—金属表面处理]