Rheological characteristics of injection molded titanium alloys powder  

注射成形钛合金粉末流变特性(英文)

作　　者：王家惠[1] 史庆南[2] 吴承玲[1] 席健[2] 

机构地区：[1]昆明理工大学 城市学院,昆明650051 [2]昆明理工大学 材料科学与工程学院,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第9期2605-2610,共6页中国有色金属学报（英文版）

摘　　要：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： ηr=η/ηb=A（1-Ф/Фmax）/^- m . 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/)rbmax,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。

关 键 词：injection molding titanium alloy FEEDSTOCK rheological properties 

分 类 号：TF12[冶金工程—粉末冶金]