原位合成(TiB_2+Fe_2B)/铁基复合材料的力学性能和耐磨性  

Mechanical Properties and Wear Resistance of In-situ Synthesized(TiB_2+Fe_2B)/Ferro-base Composites

作　　者：匡加才[1] 符寒光[2] 

机构地区：[1]长沙理工大学材料科学与工程系,湖南长沙410076 [2]清华大学先进成形制造教育部重点实验室,北京100084

出　　处：《润滑与密封》2007年第8期81-84,共4页Lubrication Engineering

基　　金：中国博士后科学基金项目(2004036058)

摘　　要：在含0.15%～0.45%C, 0.20%～0.50%Si, 0.60%～1.20%Mn和0.50%～1.50%Cu的Fe-C合金中加入硼和钛,原位合成了颗粒增强铁基复合材料.借助光学显微镜、扫描电镜和X衍射分析等手段,分析了颗粒增强相和基体组成;采用冲击试验机、材料试验机和磨损试验机等测试了复合材料的力学性能和耐磨性.研究发现,铁基复合材料的原位合成增强相是TiB2和Fe2B,且以TiB2为主.热处理后,铸态时呈条块状和针状的增强相变成团球状和颗粒状,使复合材料力学性能改善,耐磨性提高,并分析了原位合成颗粒增强相改善材料性能的原因.By adding titanium and boron in the Fe-C melt whose compositions are 0. 15% -0. 45% C ,0. 2U% -0. 50% Si ,0.60% - 1.20% Mn and 0. 50% - 1.50% Cu,in-situ reinforced particulates/Fe composites were fabricated. The reinforced phase and matrix were studied with optical microscopy（OM） , scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The mechanical properties and abrasion resistance of composites were measured in impact testing machine, materials testing machine and wear testing machine. The results show that the in-situ reinforced particulates of composites are TiB2 and Fe2 B, and TiB2 is the most. After heat treatment in-situ reinforced particulates whose shapes are strip, block and needle at as-cast turn into nodular and granular, which improves the mechanical properties and abrasion resistance of composites. The reason that in-situ reinforced particulates improve the properties of composites was analyzed.

关 键 词：复合材料 原位合成 力学性能 耐磨性 

分 类 号：TB333[一般工业技术—材料科学与工程]