流动温压成形W70Cu异形件  

W70Cu part with complex shape manufacture by warm flow compaction

作　　者：曹顺华[1] 谢湛[1] 蔡志勇[1] 李春香[1] 邹仕民[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2007年第8期1291-1296,共6页The Chinese Journal of Nonferrous Metals

摘　　要：尝试采用含量较高的粘结剂利用流动温压成形结合熔渗制备W70Cu杯状异形件。通过改变钨骨架中Cu粉类型(包括雾化Cu粉,电解Cu粉和超细Cu粉)、粘结剂添加量和成形温度,考察不同工艺参数对杯状试样的密度分布影响,以获得流动温压成形异形钨骨架的最佳工艺。结果表明:添加体积分数35%的粘结剂时提高压制温度会明显改善钨骨架孔隙度分布的均匀性;同时,由于不同Cu粉具有不同的表面形貌及粒度,对于钨骨架的孔隙度分布均匀性也有较大的影响。压制温度55℃时添加表面光滑形状规则的超细Cu粉和35%(体积分数)粘结剂的混合粉末成形的钨骨架的孔隙分布最均匀,该骨架在1 200℃熔渗30 min后,密度分布均匀,整体密度达到14.2 g/cm3(相对密度为99.0%)。W70Cu materials with a complex ＂cup＂ shape manufactured by a novel process （warm flow compaction＋ sintering filtration） were studied systematically. The effects of the type of copper powder （atomization copper powder, electrolytic copper powder and ultra-fine grained copper powder）, content of binder, and pressing temperature on porosity distribution were investigated. The results show that the complex W-skeleton with a homogeneous porosity distribution can be obtained with 35% binder addition and fairly high temperature for compaction. Meanwhile, different types of copper powders with different particle sizes and surface morphologies greatly affect the porosity distribution of the complex W-skeleton. The W-skeleton with a homogeneous porosity distribution can be obtained at 55 ℃, as the ultra-fine copper powder with slick and regular surface is used as a copper source and 35% binder is dispersed in the powder composite. As a result, a homogeneous density distribution and a general density of 14.2 g/cm^3 （relative density 99.0%） can be achieved by infiltrating at 1 200 ℃ for 30 rain.

关 键 词：W70Cu 流动温压成形 形状复杂零件 熔渗 

分 类 号：TF125[冶金工程—粉末冶金]