钨渗铜材料高温力学性能与组织研究

Research on the Mechanical Properties and Microstructure of W-Cu Composite Used in High-temperature Field

从不同原料钨粉粒度和不同钨骨架密度的角度,研究其对于材料高温强度性能的影响,同时结 合SEM断口形貌观察,研究材料在高温下的断裂机制。结果表明:(1)随着钨骨架密度的提高,材料的高温 强度都相应提高,在一定的骨架密度范围内,高的骨架密度有利于材料高温强度的提高;(2)对于两种粉末 原料的钨渗铜试样,在相近骨架相对密度的情况下,由于细晶强化的作用,细颗粒试样从800℃～1800℃的 高温强度都明显高于相应的中颗粒试样;(3)对于钨渗铜材料,从800℃～1800℃的过程中,断裂形式由穿 晶和沿晶断裂两种形式并存逐渐过渡到单一的沿晶断裂。

The effect of different W-powder sizes and W-skeleton densities on the high-temperature strength of W/Cu composile is studied. Also, the research on its fracture mechanism at high temperature is conducted by SEM micrograph observation. The results show that (1) high-temperature strength of the composite is increased with the W-skeleton density increasing, and in certain skeleton density, high density is benefit to high-temperature strength increasment; (2) for two kinds of W/Cu powder samples of relative density of similar skeleton, samples fabricated by fine particle powder have obviously higher strength than that of med-particle powder at temperatures of 800℃ to 1 800℃ due to fine particle strengthening; (3) this material fracture is changed from transgranular, intergranular to intergranualar alone at above temperatures range.