激光燃烧合成掺杂钨精矿FeAl复合材料组织及性能

通过对掺杂不同含量钨精矿粉末Fe-Al系粉末压坯进行激光点燃自蔓延烧结(SHS), 利用XRD、 SEM、 硬度测试、 磨损测试表征手段, 分析研究了钨精矿粉含量对烧结合金微观组织结构及宏观性能的影响。实验结果表明: 在烧结过程中, 压坯实现了自蔓延燃烧。合金组织为针状组织, 且随着钨精矿粉含量的增加, 针状组织长大。产物物相主要为AlFe、 AlFe₃、 WO₃以及Fe₇W₆。当钨精矿粉添加量为1%时, 烧结合金显微硬度最大, 达到HK956, 烧结合金的密度最大, 为4.27 g/cm³, 孔隙率最小, 为12.2%, 烧结合金的相对磨损率最低, 达到0.05%。

Microstructure and properties of Fe-Al composite material blended with tungsten concentrate powder prepared by laser combustion synthesis

Fe-Al alloy blended with different levels of tungsten concentrate powder was prepared by laser ignition induced self-propagating high-temperature synthesis(SHS).By means of the XRD,SEM,hardness test and abrasion test,the effect of the content of tungsten concentrate powder on the sintered alloy microstructure and macroscopic properties was studied.The experimental results show that through the sintering process,the self-propagating combustion synthesis of the blank was achieved.The structures of the sintered alloy are acicular,which grow up with the increase of the content of tungsten concentrate powder.The product phase of the sintering alloy are AlFe,AlFe3,WO3 and Fe7W6.When the mass fraction of the tungsten concentrate powder is 1%,the micro-hardness and the density of the sintering alloy are both the biggest,which are HK956 and 4.27 g/cm3 respectively,while the porosity and the relative wear rate of the sintering alloy are the lowest,which are 12.2% and 0.05% respectively.