【摘要】 将W 2 0 %Cu混合粉末在行星式高能球磨机中机械合金化 (MA)。经过一定时间球磨后可以得到W晶块尺寸 30nm左右的纳米粉末。测定了粉末晶粒尺寸、粉末的粒度、比表面、松装密度和振实密度等性能。粉末的晶块尺寸用XRD分析得出。研究了MAW 2 0 %Cu粉末烧结后的显微组织。研究表明 ,球磨后粉末在 12 0 0～ 130 0℃下烧结即可达到近全致密 ,相对密度在 99 5 %以上 ,拉伸强度达到 780MPa以上 ,伸长率大于 3 5 % ,钨晶粒尺寸在 1～ 2 μm左右。更多还原

【Abstract】 Elemental W-20%Cu powder mixtures were mechanically alloyed in a planetarg high ball milling. After a certain time of high-energy ball milling, nanostructured W-Cu composite powder was obtained where W crystalline size about 30nm. Crystalline sizes of milled powder were analyzed by means of XRD. Meanwhile the powder characterization such as particle size, distribution, apparent density and tap density of MA-ed powder were examined. The green part from the nanostructured powder was then sintered at 1200～1300 ℃ . The relative density of the sample is higher than 99.5%, tensile strength is higher than 780MPa, elongation of the samples higher than 3.5% and tungsten grain is about 1～2μm.更多还原