反应烧结制备FeAl/Al2O3复合材料的研究

对不同成分配比的Fe2O3粉和Al粉末生坯分别进行900,1 000,1 100℃烧结,利用自蔓延反应放热和加热炉加热的综合作用制备FeAl/Al2O3复合材料。用扫描电镜、维氏硬度计、M-200型磨损试验机对烧结合金的金相组织、硬度以及磨损性能进行测试。结果表明:Fe2O3-Al在适当配比和烧结温度下,可以合成以FeAl为基体、Al2O3和铝铁金属间化合物为增强相的复合材料;试样烧结前后相对密度受Al含量和烧结温度的影响,Al含量越高,烧结温度越高,相对密度越大;Al的质量分数为40.3%,1 100℃烧结后的样品具有最高硬度和最佳耐磨性能。

Preparation of FeAl/Al2O3 composite by reaction sintering

FeAl/Al2O3 composite material was prepared with different composition Fe2O3 and Al powder,green compact was sintered at 900,1 000,1 100 ℃,respectively.Self-propagating high temperature and heating furnace acted together as heat source in the process.The microstructure,hardness and wear resistance were tested by scanning electron microscope,Vickers hardness tester,M-200 type wear testing machine.It is found that with Fe2O3-Al in proper proportion and at proper sintering temperature,the composite material can be synthesized with AlFe as matrix,Al2O3 and AlFe intermetallic as reinforcing phase.Relative density of sample before and after sintering is influenced by Al content and sintering temperature,the higher the Al content,the higher the sintering temperature,the greater the relative density.The samples with mass fraction of Al in 40.3%,sintered at 1 100 ℃ achieve the highest hardness and best wear resistance.