无压烧结ZnAl/Fe基非晶复合材料的导热性能研究

采用无压烧结制备韧性Zn Al颗粒增强Fe基非晶复合材料,利用X射线衍射仪、扫描电镜、差热分析仪和激光闪射热导率测试仪分析了复合材料的结构、热稳定性及导热性能。结果表明:在过冷液相区内无压烧结可得到致密的Zn Al/Fe基非晶复合材料;Zn Al的引入没有影响Fe基非晶基体的本质;烧结过程中没有界面反应相生成;复合材料的热稳定性有所降低,但降低幅度不大;在298~423 K范围内,复合材料比Fe基非晶合金有更低的热传导系数,其热扩散系数随温度的升高变化不大,表明材料具有较好的保温性能。

Thermal Conductivity Properties of ZnAl/ Fe-based Amorphous Composites Manufactured by Pressureless Sintering

The Fe-based amorphous composites reinforced by toughness ZnAl particle were prepared using pressureless sintering methods, and the structure, thermal stability and thermal conductivity of the composite material were investigated by XRD, SEM, DSC and laser indeed thermal conductivity tester, respectively. The results illustrate that compact ZnAl/ Fe-based amorphous composites can be formed by using pressureless sintering technique in the supercooled liquid region. ZnAl has no effect on the nature of Fe-based amorphous matrix. There is no interface reaction phase generated in sintering process, but the thermal stability slightly decreases. Within the scope of the 298 K to 423 K, the heat conduction coefficient of composites is lower than that of the Fe-based amorphous alloy, and the thermal diffusion coefficient slightly change with the raising the temperature, which show that the composite materials has the better thermal insulation property.