Ti−6Al−4V alloy powder was taken as raw material. 60%(mass fraction) paraffin, 35%low density polyethylene and 5%stearic acid were employed as binders to prepare injection feedstocks. Capillary rheometer was adopted to determine the rheological parameters and to analyze the rheological properties of the feedstocks at different milling time, powder loading and temperature. It is indicated through the results that the viscosity increases and the value of n decreases with the increase of milling time. The more the powder loading is, the higher the viscosity is. The empirical formula on the relationship between the viscosity and the powder loading is: rb max/ A(1 / ) mη ηη φφ −= = − . The value m is calculated as 0.33. The flow activation energy Ea decreases with the increase of shear rate.%以Ti−6Al−4V合金粉末为原料，选用60%(质量分数)石蜡、35%低密度聚乙烯和5%硬脂酸为粘结剂配方制备注射成型喂料。采用毛细管流变仪测定喂料的流变参数，分析不同球磨时间、粉末装载量、温度下喂料的流变学性能。结果表明：随着球磨时间的增加，喂料粘度增加，n 值减小；粉末装载量越高，喂料的粘度值越大，而且粘度与粉末装载量满足经验公式： mA −=−=(1/)/ maxbr φφηηη，经计算，m的值为0.33。粘性流动激活能Ea值随剪切速率的增加而减小。
展开▼
