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

被引：0
|
作者：
Li Z.-S. [1 ]
Wu H.-L. [1 ]
Chen H.-T. [1 ]
Cong D.-L. [1 ]
Zhang M. [1 ]
He Q.-B. [1 ]
Peng D. [1 ]
机构：
[1] Southwest Institute of Technology and Engineering, Chongqing
来源：
Surface Technology | 2023年 / 52卷 / 10期
关键词：
ablation resistant coating; electrospark deposition; linear ablation rate; mass ablation rate; molybdenum; tungsten;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.10.020
中图分类号：
学科分类号：
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. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
引用
收藏
页码：250 / 258
页数：8
相关论文
共 35 条
  • [1] LIU Yan-hong, ZHANG Ying-chun, GE Chang-chun, Research Progresses on Preparation Technologies of Tungsten Coating, Materials Science and Engineering of Powder Metallurgy, 16, 3, pp. 315-322, (2011)
  • [2] ZHU Qi, WANG Lin, YANG Qin-li, Et al., Study on Microstructure and Properties of Molybdenum Tungsten Alloy, China Molybdenum Industry, 37, 5, pp. 49-51, (2013)
  • [3] PAN Ye-jin, Molybdenum, Tungsten and Their Alloys, China Molybdenum Industry, 25, 2, pp. 44-47, (2001)
  • [4] WANG Shuang, LUO Lai-ma, ZHAO Mei-ling, Et al., Current Status and Development Trend of Toughening Technology of Tungsten-Based Materials, Chinese Journal of Rare Metals, 39, 8, pp. 741-748, (2015)
  • [5] SU Yu, LIU Ning, TANG Zhen-qi, Et al., Valence Electron Structure and Property of W-Mo Solid Solution Alloy, Heat Treatment, 30, 6, pp. 13-16, (2015)
  • [6] HONG Xiang, FENG Ke, TAN Ye-fa, Et al., Effects of Process Parameters on Microstructure and Wear Resistance of TiN Coatings Deposited on TC11 Titanium Alloy by Electrospark Deposition, Transactions of Nonferrous Metals Society of China, 27, 8, pp. 1767-1776, (2017)
  • [7] WANG Wen-quan, DU Ming, ZHANG Xin-ge, Et al., Microstructure and Tribological Properties of WC-Ni Matrix Cermet Coatings Prepared by Electrospark Deposition on H13 Steel Substrate, Acta Metallurgica Sinica, 57, 8, pp. 1048-1056, (2021)
  • [8] ZHANG Yong, LI Li, CHANG Qing, Et al., Research Status and Prospect of Electro-Spark Deposition Technology, Surface Technology, 50, 1, pp. 150-161, (2021)
  • [9] WANG Yan-fang, SI Shuang-shuang, SONG Zeng-jin, Et al., Microstructure and Tribology Behaviors of Zr-Based Amorphous Coating on ZL101 by Electro-Spark Deposition, Transactions of the China Welding Institution, 39, 7, pp. 121-124, (2018)
  • [10] WANG Xi, ZHU Chun-ming, JIN Hao, Et al., Oxidation Behavior of Electrospark Depositing NiCrAlY Coating on Gun Steel, Journal of Shenyang Ligong University, 40, 3, pp. 41-45, (2021)
1234