摘要
设计并用熔渗法制备Mo/Cu系多层新型密度梯度材料 ,观察Mo/Cu系梯度材料的显微组织并分析烧结熔渗过程。过渡层密度从 8.9g/cm3至 9.9g/cm3沿厚度呈准连续变化 ,热导率和电导率介于Mo与Cu之间且更接近与Cu。在富Cu侧主要是靠熔化的Cu进行液相烧结 ,固相Mo颗粒弥散在铜的基体中。而在富Mo侧 ,晶界扩散和体积扩散机制占主导。梯度层硬度随铜含量增加呈线性降低 ,当Cu≥ 60 %时 ,硬质相Mo的作用几乎丧失。
Mo/Cu system functionally graded material (FGM)is designed and prepared by infiltration sintering. The microstructure of Mo/Cu FGM is observed by SEM, and the mechanism of sintering infiltration is discussed. The density of transition layers changes quasi continuously in the thickness direction within a range of 8.9g/cm 3～9.9g/cm 3, the conductivities of heat and electricity are near to the copper's between the properties of Cu and Mo. The molten sintering occurs on the Cu rich side by copper melting and the Mo solid particles disperses in the copper base. The diffusion is dominant on the Mo rich side. The hardness is directly reduces with the increase of copper content, while the copper is higher than 60%, the effect of Mo on hardness almost disappears. The mechanical property and electrical resistance and thermal fatigue resistance are decreased with the increase of temperature.
出处
《有色金属》
CSCD
2002年第2期12-15,共4页
Nonferrous Metals
