摘要
采用等离子喷涂在金属钼棒表面沉积W涂层,对所得W/Mo棒进行高温烧结-旋锻处理,观察处理前后沉积层、基体及界面的显微形貌,测试W涂层与Mo基体的晶粒度、相对密度和显微硬度,研究高温烧结-旋锻处理对W/Mo棒结构与性能的影响。结果表明:高温烧结-旋锻后,W沉积层的相对密度达到98.5%,比处理前提高了15.9%,显微硬度为620.4HV0.025,提高了81.6%;而Mo基体的相对密度为99.5%,提高了0.71%,显微硬度为244.5HV0.025,降低了4.8%;W沉积层晶粒长大不明显,外部晶粒轴向拉长最明显,中部次之,内部几乎没有变形;而Mo基体晶粒明显长大至300μm,变形程度比W显著;此外,W/Mo界面高温烧结后形成100μm的大小晶粒过渡区,旋锻后没有出现明显的裂纹。
A molybdenum bars and a tungsten deposition on the surface of metal molybdenum rod （W/Mo bars） are processed by high temperature sintering and rotary swaging. Microstructure before and after the treatment of tungsten layer, molybdenum matrix and W/Mo interface are observed, and tungsten coating and molybdenum substrate grain size, relative density and micro hardness are tested. Effect of high temperature sintering-rotation swaging treatment to properties and structure of W/Mo rod are discussed. The results show that, after high temperature sintering （2 300℃, 6 h）and rotary swaging, tungsten deposition layer density is 98.5 %, increased by 15.9 % than that before the treatment, the micro-hardness is 620.4HV0.025, increased by 81.6%, and the density of molybdenum matrix is 99.5%, increased by 0.71%, the micro-hardness of Mo is 244.5HV0.025, reduced by 4.8%. Tungsten deposition layer grain growth is not obvious, elongation grade of external grains of tungsten coating is more obvious than the central one, and the internal one is undeformed. While the Mo matrix grains grow up to 800 μm, is more significant than W coating. In addition, the W/Mo interface and grain transition zone with grain size 100 μm are formed after high temperature sintering, but no obvious crack is found after rotary swaging.
出处
《中国钨业》
CAS
2014年第6期35-40,共6页
China Tungsten Industry
基金
中国博士后科学基金面上项目(2013M531804)
中国博士后科学基金特别项目(2014T70784)
湖南省自然科学基金面上项目(10JJ5056)
材料复合新技术国家重点实验室开放基金(2015-KF-14)
粉末冶金国家重点实验室开放基金(2014-SKL-33)
关键词
W沉积层
Mo基体
高温烧结
旋锻
组织
W coating
Mo substrate
high temperature sintering
rotary swaging
microstructure
