杨二娟,李勇,李巍,李太江,李毅超,刘峰,米紫昊,王博.WC含量对激光熔覆NiCrBSi-WC复合涂层显微结构及力学性能的影响[J].表面技术,2019,48(9):238-244.
YANG Er-juan,LI Yong,LI Wei,LI Tai-jiang,LI Yi-chao,LIU Feng,MI Zi-hao,WANG Bo.Effect of WC Particle Content on Microstructure and Mechanical Properties of Laser Cladded NiCrBSi-WC Composite Coating[J].Surface Technology,2019,48(9):238-244
WC含量对激光熔覆NiCrBSi-WC复合涂层显微结构及力学性能的影响
Effect of WC Particle Content on Microstructure and Mechanical Properties of Laser Cladded NiCrBSi-WC Composite Coating
投稿时间:2019-02-25  修订日期:2019-09-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.09.027
中文关键词:  金属陶瓷复合涂层  激光熔覆  WC颗粒  显微组织  硬度  断裂韧性  耐磨性
英文关键词:composite coating  laser cladding  WC particle  microstructure  hardness  fracture toughness  wear resistance
基金项目:中国华能集团科技项目(HNKJ17-H22-02)
作者单位
杨二娟 1.西安热工研究院有限公司,西安 710054 
李勇 1.西安热工研究院有限公司,西安 710054 
李巍 1.西安热工研究院有限公司,西安 710054 
李太江 1.西安热工研究院有限公司,西安 710054 
李毅超 2.华能西藏雅鲁藏布江水电开发投资有限公司,拉萨 860000 
刘峰 2.华能西藏雅鲁藏布江水电开发投资有限公司,拉萨 860000 
米紫昊 1.西安热工研究院有限公司,西安 710054 
王博 1.西安热工研究院有限公司,西安 710054 
AuthorInstitution
YANG Er-juan 1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China 
LI Yong 1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China 
LI Wei 1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China 
LI Tai-jiang 1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China 
LI Yi-chao 2.Huaneng Tibet Yarlung Zangbo River Hydropower Development Investment Co., Ltd, Lhasa 860000, China 
LIU Feng 2.Huaneng Tibet Yarlung Zangbo River Hydropower Development Investment Co., Ltd, Lhasa 860000, China 
MI Zi-hao 1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China 
WANG Bo 1.Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China 
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中文摘要:
      目的 为盾构、勘探及采矿等高载荷严苛磨损条件下的构件表面防护提供一种新的涂层方法。方法 以激光熔覆技术为手段,在NiCrBSi粉末中混入30%~80%(体积分数)的球形WC颗粒,用以制备NiCrBSi-WC复合涂层。研究了WC颗粒含量对涂层显微组织形成、硬度、断裂韧性和耐磨性的影响规律。采用SEM分析了涂层的显微组织;通过显微维氏硬度计测试涂层的硬度;通过压痕法测试涂层的断裂韧性;采用磨粒磨损试验表征涂层的耐磨性。结果 当WC颗粒体积分数低于60%时,熔融金属的黏度较低,密度更大的WC颗粒会沉淀,导致涂层表层的WC颗粒含量较低;当WC颗粒体积分数介于60%~80%时,WC颗粒在涂层内均匀分布,涂层内无气孔及裂纹等缺陷。当WC颗粒体积分数达到80%时,熔体黏度过大,使气体难以及时逸出,在涂层内形成大量气孔。随着WC体积分数由30%上升到80%时,涂层的平均硬度由67HRC提高到85HRC。涂层的断裂韧性随WC含量的提高,出现先升高后下降的反常现象。60%WC含量的复合涂层表现出最佳的耐磨性,比滚刀常用材料H13钢提高约9倍。结论 采用常规激光熔覆技术时,添加40%~60%范围内的硬质陶瓷颗粒,可获得硬质颗粒分布均匀且耐磨性与抗冲击性能优异的复合涂层。
英文摘要:
      The work aims to provide a new coating method for protecting component surface under severe wear conditions of high load during shielding, exploration, mining, etc. NiCrBSi/WC composite coating was prepared by laser cladding through adding 30%~80% spherical WC particles in NiCrBSi powders. Effect of the WC particle content on microstructure formation, hardness, fracture toughness and abrasive wear resistance was systematically investigated. Microstructure of coating was analyzed by SEM, hardness was tested by the Vickers hardness tester, the fracture toughness was investigated by indentation method and the wear resistance was characterized by abrasive wear test. When mass fraction or volume fraction of WC particle was lower than 60%, the viscosity of molten metal was lower, and WC particles with higher density precipitated, resulting in lower WC particle content in the coating surface layer. When the content of WC particles ranged from 60% to 80%, WC particles were uniformly distributed in the coating, and there were no defects such as pores and cracks in the coating. As mass fraction of WC particles increased to 80%, the melt viscosity was too high, which made it difficult for gas to escape in time and formed a large number of pores in the coating. As the WC mass fraction increased from 30% to 80%, the average hardness of the coating increased from 67HRC to 85HRC. The fracture toughness of the coating increased first and then decreased with the increase of WC content. The composite coating with 60%WC content showed the best wear resistance, which was about 9 times higher than that of H13 steel as the common hob material. When conventional laser cladding technology is adopted, a composite coating with uniform distribution of hard particles and excellent wear resistance and impact resistance can be obtained by adding hard ceramic particles in the range of 40%~60%.
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