摘要铁铝基金属间化合物作为一种新型的高温结构材料具有低成本、低密度、良好 的耐磨性和优秀的抗硫化、抗氧化性能。本文运用了沉淀法离心分离的方法制取了 Ba0。25Sr0。75SO4 固溶体粉体，并且把该粉体与纯的 Fe3Al 混合球磨在真空热压烧结炉中 制备成所需的复合材料。且分别制备 Ba0。25Sr0。75SO4 含量各为 15wt%和 30 wt%，分别 简称为 FBS15 和 FBS30。后依次使用扫描电镜，X 射线衍射仪分析 FBS15 和 FBS30 复合材料组成和微观结构,用能谱仪得到其微观形貌分布图。又通过万能力学试验机 和真空摩擦磨损试验机等方法测出 FBS15 和 FBS30 的摩擦系数，磨损率和磨斑电镜 照片，所得结论如下：制得的 FBS15 和 FBS30 的纯度很高，杂质的量很少；相比于 大气环境，真空环境下添加 Ba0。25Sr0。75SO4 的复合材料使得 Fe3Al 的摩擦系数明显降 低；在一定载荷下，复合材料的摩擦系数受载荷的大小影响很小，且 Ba0。25Sr0。75SO4 量的改变对滑动摩擦的影响也不大；而磨损率与载荷成正比且随着 Ba0。25Sr0。75SO4 的 增大而减少；由 FBS15 和 FBS30 在不同载荷下的磨斑电镜照片可得，Ba0。25Sr0。75SO4 的增加了 Fe3Al 在真空环境下的抗磨损性能。81125

毕业论文关键词：Fe3Al 金属间化合物;Ba0。25Sr0。75SO4;真空摩擦;磨损机理

Abstract Fe-Al inter-metal compound as a new high-temperature structural materials have a low cost, low density, good wear resistance and excellent resistance to sulfide oxidation resistance。 In this paper, the methods centrifugal sedimentation separation took Ba0。25Sr0。75SO4 solid solution powder, and the powder milled to Fe3Al mixed with pure into the desired composite material in a vacuum sintering furnace。 And were prepared Ba0。25Sr0。75SO4 content of each of 15wt% and 30 wt%, respectively referred to as FBS15 and FBS30。 After the sequential use of scanning electron microscopy, X-ray diffraction analysis FBS15 and FBS30 composite composition and microstructure, with  a spectrometer to obtain its microstructure distribution。 And measured by universal mechanical testing machine and vacuum tribometer methods such as the coefficient of friction FBS15 and FBS30 wear rate and wear scar electron micrographs of the resulting conclusions are as follows: high obtained FBS15 and FBS30 purity, the amount of impurities are less; compared to the atmosphere, adding Ba0。25Sr0。75SO4 composite material under vacuum so that the friction coefficient decreased Fe3Al; at certain load, the size of the impact of the friction coefficient of the composite by the load is small, and Ba0。25Sr0。75SO4 Effect of change 。The amount of sliding friction is not great; but the wear rate is proportional to the load and with increasing Ba0。25Sr0。75SO4 is reduced; and by the FBS15 FBS30 wear scar electron micrographs at different loads available , Ba0。25Sr0。75SO4 Fe3Al increased wear resistance in a vacuum environment。

Keywords: Fe3Al intemetallics; Ba0。25Sr0。75SO4;Vacuum friction; wear mechanism

目 录

第一章 绪论 1

1。1 铁铝系金属间化合物的特点 1

1。1。1 金属间化合物简介 1

1。1。2 Fe-Al 系金属间化合物简介 2

1。1。3 Fe-Al 金属间化合物的力学性能 2

1。1。4 Fe3Al 金属间化合物的摩擦学性能 5

1。1。5 Fe-Al 系金属间化合物的现状和前景 6

1。2 摩擦与磨损 8

1。2。1 摩擦磨损的分类