钢表面电火花沉积合成W-Mo高熔点复合涂层  

High Melting Point Composite Coating of W-Mo Alloy Synthesized by Electrospark Deposition on Steel Surface

作　　者：李忠盛[1] 吴护林[1] 陈海涛 丛大龙[1] 张敏[1] 何庆兵[1] 彭冬 LI Zhong-sheng;WU Hu-lin;CHEN Hai-tao;CONG Da-long;ZHANG Min;HE Qing-bing;PENG Dong(Southwest Institute of Technology and Engineering,Chongqing 400039,China)

机构地区：[1]西南技术工程研究所,重庆400039

出　　处：《表面技术》2023年第10期250-258,共9页Surface Technology

基　　金：联合基金(6141B02030201)。

摘　　要：目的 采用ZY-10型电火花堆焊/涂层沉积设备,分别以钼和钨棒料为电极,以超纯氩气为保护气体,在PCrNi3MoVA钢基体表面沉积合成W-Mo高熔点复合涂层。方法 在PCrNi3MoVA钢基体表面先沉积出一定厚度的钼涂层作为打底层,在此基础上,采用更高的电参数沉积硬度和熔点都较高的钨涂层。作为同族元素的钼和钨,在高温电弧作用下能较好地合成W-Mo高熔点复合涂层。通过对复合涂层的成分、微观形貌等进行观察和分析,用等离子烧蚀实验检测复合涂层的抗烧蚀性能,并计算复合涂层的质量烧蚀率和线烧蚀率。结果 采用电火花沉积工艺在PCrNi3MoVA钢基体表面成功制备了W-Mo高熔点复合涂层,其厚度达到100μm以上,该复合涂层主要由W、Mo、Fe等成分组成,且越靠近涂层表面,W和Mo元素的含量越高,复合涂层主要有Mo、MoC、Fe_(2)Mo_(3)、Fe_(2)W等物相,复合涂层的耐烧蚀性能较好,在前10 s内其线烧蚀率仅为0.090~0.267 mm/s。结论 W-Mo高熔点复合涂层的厚度随着沉积次数和沉积电压的增加而增加;复合涂层与基体相互熔融,具有较好的冶金结合特征;复合涂层能够承受等离子火焰的短时高温冲击与冲刷,增加复合涂层的厚度可以有效抑制涂层试样烧蚀率的增加。The high melting point composite coating of W-Mo alloy with a thickness of 100 μm was prepared on the surface of PCrNi3MoVA steel by ZY-10 type EDM surfacing/coating deposition equipment,with tungsten and molybdenum rods as electrodes and ultrapure argon as protective gas.In terms of technology,a molybdenum coating of a certain thickness was firstly deposited on the surface of the PCrNi3MoVA steel substrate as the primer,and then tungsten coating was deposited on the surface of molybdenum coating.Since tungsten had a higher melting point and hardness than molybdenum,it was more difficult to deposit tungsten coating on the surface of PCrNi3MoVA steel substrate.During deposition of tungsten coating,parameters such as pulse voltage,deposition frequency and duty cycle higher than those of molybdenum coating were used.The pulse voltage was above 60 V,deposition frequency was 700-800 Hz,duty cycle was 50%,molybdenum and tungsten electrodes were3 mm.The micro morphology of the surface and cross section of the composite coating were observed by type QUANTA 200environment scanning electron microscope from FEI and metallographic microscope,the composition of the composite coating was analyzed by INCA energy dispersive spectrometer from OXFORD,and the phase composition of the composite coating was analyzed by EMPYREAN X-ray diffractometer from PANalytical.The ablation resistance of the W-Mo high melting point composite coating was tested by a new type of plasma flame simulation ablation test system developed by the Southwest Institute of Technology and Engineering.The equipment relied on the ultra-high temperature plasma jet to vertically burn the surface of the sample,ablate or burn through the materials to be tested,measure the back surface temperature and ablation time during the ablation process of the sample,measure the thickness and mass change of the sample before and after the test,and calculate the linear ablation rate,mass ablation rate and other indicators of the sample.The results indicated that W-Mo high melti

关 键 词：电火花沉积 钨 钼 耐烧蚀涂层 质量烧蚀率 线烧蚀率 

分 类 号：TG174[金属学及工艺—金属表面处理]