李忠盛,吴护林,陈海涛,丛大龙,张敏,何庆兵,彭冬.钢表面电火花沉积合成W-Mo高熔点复合涂层[J].表面技术,2023,52(10):250-258.
LI Zhong-sheng,WU Hu-lin,CHEN Hai-tao,CONG Da-long,ZHANG Min,HE Qing-bing,PENG Dong.High Melting Point Composite Coating of W-Mo Alloy Synthesized by Electrospark Deposition on Steel Surface[J].Surface Technology,2023,52(10):250-258
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
投稿时间:2022-09-21  修订日期:2023-01-09
DOI:10.16490/j.cnki.issn.1001-3660.2023.10.020
中文关键词:  电火花沉积      耐烧蚀涂层  质量烧蚀率  线烧蚀率
英文关键词:electrospark deposition  tungsten  molybdenum  ablation resistant coating  mass ablation rate  linear ablation rate
基金项目:联合基金(6141B02030201)
作者单位
李忠盛 西南技术工程研究所,重庆 400039 
吴护林 西南技术工程研究所,重庆 400039 
陈海涛 西南技术工程研究所,重庆 400039 
丛大龙 西南技术工程研究所,重庆 400039 
张敏 西南技术工程研究所,重庆 400039 
何庆兵 西南技术工程研究所,重庆 400039 
彭冬 西南技术工程研究所,重庆 400039 
AuthorInstitution
LI Zhong-sheng Southwest Institute of Technology and Engineering, Chongqing 400039, China 
WU Hu-lin Southwest Institute of Technology and Engineering, Chongqing 400039, China 
CHEN Hai-tao Southwest Institute of Technology and Engineering, Chongqing 400039, China 
CONG Da-long Southwest Institute of Technology and Engineering, Chongqing 400039, China 
ZHANG Min Southwest Institute of Technology and Engineering, Chongqing 400039, China 
HE Qing-bing Southwest Institute of Technology and Engineering, Chongqing 400039, China 
PENG Dong Southwest Institute of Technology and Engineering, Chongqing 400039, China 
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中文摘要:
      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100 μm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、Fe2Mo3、Fe2W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。
英文摘要:
      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 were 3 mm. The micro morphology of the surface and cross section of the composite coating were observed by type QUANTA 200 environment 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 melting point composite coating was successfully synthesized on the surface of PCrNi3MoVA steel substrate by the electrospark deposition process. The ablation resistance of the composite coating was good. The linear ablation rate in the first 10 seconds was 0.090-0.267 mm/s. The thickness of the composite coating is greatly affected by the deposition times and deposition voltage. The composite coating is mainly composed of W, Mo, Fe and other components, and the closer to the coating surface, the higher the content of W and Mo elements. The composite coating is mainly composed of Mo, MoC, Fe2Mo3, Fe2W and other phases. The microstructure of the composite coating is compact, uniform and continuous and no cracks, holes and other defects are found on the coating, forming a good metallurgical bond with the steel substrate. The composite coating can withstand the high temperature short-time impact and erosion of the plasma flame, and the increase of the composite coating thickness can effectively inhibit the increase of the coating ablation rate, improving the ablation resistance.
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