CNTs/Cu复合超细粉末及其复合材料的制备

Fabrication of CNTs/Cu ultrafine powders and composite materials

以硝酸铜和预处理碳纳米管(CNTs)为原料,采用喷雾干燥-煅烧-还原工艺获得超细CNTs/Cu复合粉体。将复合粉体分别利用模压成形(MP)和冷等静压成形(CIP)两种工艺分别制备出CNTs/Cu复合材料。比较两种工艺下得到的复合材料的致密度、硬度、导电率和导热性能。结果表明:喷雾干燥法制备的复合粉体纯度高,CNTs分散均匀。冷等静压成形优于模压工艺,冷等静压工艺制备的复合材料中CNTs含量为0.5%(质量分数)时,硬度和热导率分别达到105.24 HV和407.84W/(m·K)。

CNTs/Cu ultrafine powders were prepared from copper nitrate and pre-treated carbon nanotubes via spraying drying-calcination-hydrogen reduction method. CNTs/Cu composites with different CNTs contents were prepared by mould pressing（MP） and cold isostatic pressing（CIP） of the CNTs/Cu ultrafine powders. The relative density, microhardness, eletrical conductivity and thermal conductivity of the CNTs/ Cu composites were compared. The results indicate that the CNTs powders is high pury and distributes homogeneously, the cold isostatic pressing method is superior to the mould pressing method, especially for the 0.5%（mass fraction） CNTs composite formed by cold isostatic pressing, the microhardness and thermal conductivity increase to 105.24 HV and 407.84 W/（m·K）, respectively.