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采用溶胶-喷雾干燥-煅烧-氢气还原的方法制备了纳米晶Mo-18Cu、Mo-30Cu、Mo-40Cu复合粉末,研究了纳米晶Mo-Cu粉末的烧结行为以及Cu含量对致密化的影响。结果表明,纳米晶Mo-Cu复合粉末致密化程度高,速度快,在1050～1200°C烧结,Mo-30Cu和Mo-40Cu的相对密度可达98%以上,且合金晶粒细小,而Mo-18Cu在1350°C以上烧结,相对密度也可达98%以上,但晶粒聚集长大到5μm左右。研究发现Mo-Cu复合粉末形成了亚稳态的超饱和Mo(Cu)固溶体,随着烧结温度的升高,Cu相逐渐从亚稳态的超饱和Mo(Cu)固溶体颗粒中析出。
The nanocrystalline Mo-18Cu, Mo-30Cu, Mo-40Cu composite powders were prepared by sol-spray drying-calcination-hydrogen reduction method. The sintering behavior of nanocrystalline Mo-Cu powders and the effect of Cu content on densification were investigated. The results show that the relative density of Mo-30Cu and Mo-40Cu sintered at 1050 ~ 1200 ° C can reach over 98%, and the grain size of the alloy is small. The Mo -18Cu sintered at 1350 ° C or above, the relative density of up to 98%, but the grain grow up to about 5μm. The results show that the Mo-Cu composite powders form a metastable supersaturated Mo (Cu) solid solution, and the Cu phase gradually precipitates from the metastable supersaturated Mo (Cu) solid solution particles as the sintering temperature increases.