氧化镧含量对钼板组织与性能的影响  

Effect of Lanthanum Oxide Content on Microstructure and Properties of Molybdenum Plates

作　　者：魏世忠[1] 周玉成[1,2] 段素红[1] 张国赏[1] 

机构地区：[1]河南科技大学河南省耐磨材料工程技术研究中心,河南洛阳471003 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《河南科技大学学报（自然科学版）》2013年第2期1-4,6,共4页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(50972039);河南省重大科技基金专项(092102213111)

摘　　要：采用溶胶凝胶、粉末冶金等工艺制备了氧化镧掺杂钼合金。研究了氧化镧对烧结坯的金相组织和显微硬度的影响。将烧结坯轧制成厚度为1.0 mm的板材,经不同温度退火后进行室温拉伸试验,并利用热-力学物理模拟试验机对其高温拉伸性能进行了测试。研究结果表明:镧以氧化镧的形式存在于钼合金中,并使其晶粒细化而大小均匀,随着氧化镧掺杂量的增多,显微硬度逐渐增加。氧化镧掺杂钼板的室温强度和高温强度比纯钼板有较大提高,并随着氧化镧掺杂量增加而增加。掺杂钼板的室温延伸率较纯钼板高。掺杂钼板的延伸率在掺杂量为1.0%时最好。The molybdenum alloys doped with La2O3 were prepared by sol-gel and powder metallurgy methods.The effect of La2O3 on metallographic structure and micro-hardness of sintering billets was studied.After the sintering billets were rolled into a thickness of 1.0 mm plates,the tensile strength of molybdenum plate annealed at different temperatures was tested at room temperature.And the high temperature deformation behaviors of Mo-La2O3 plates were tested from 900 ℃ to 1 200 ℃.The results show that La ultimately exists in molybdenum alloys in the form of lanthanum oxide,which can refine grain and make grain size be uniform.With the increase in amount of lanthanum oxide,the hardness becomes higher gradually.The tensile strengths under room temperature and high temperature of molybdenum plate doped with lanthanum oxide are improved compared to pure molybdenum plate and increased with the content of lanthanum oxide.The elongation of molybdenum plate is higher than pure molybdenum under room temperature.The elongation of molybdenum plate doped with 1.0% lanthanum oxide is the best among three kinds of doping molybdenum plates.

关 键 词：钼合金 氧化镧 高温性能 溶胶-凝胶法 

分 类 号：TG146.4[一般工业技术—材料科学与工程]