微晶蜡基WC-10Co注射成形喂料的流变性能及溶剂脱脂行为  

Rheological property and solvent debinding behavior of microcrystalline wax based feedstocks for injection molding

作　　者：袁建坤 杨宇 陈鹏起 程继贵[1,2] YUAN Jian-kun;YANG Yu;CHEN Peng-qi;CHENG Ji-gui(School of Material Science and Engineering,Hefei University of Technology,Hefei 230009,China;Research Centre for Powder Metallurgy Engineering and Technology of Anhui Province,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]安徽省粉末冶金工程技术研究中心,合肥230009

出　　处：《粉末冶金技术》2022年第5期413-420,共8页Powder Metallurgy Technology

基　　金：安徽省重点研究与开发计划资助项目(202104a05020046)。

摘　　要：以微晶蜡为粘结剂主要组元,与WC–10Co(YG10)粉末密炼混合,得到注射成形喂料。通过线性拟合计算出喂料的非牛顿指数、粘流活化能和综合流变学因子,考察不同温度与剪切速率下喂料的流变性能。对成形坯体在不同温度下于不同脱脂溶剂中的失重进行分析,考察坯体的溶剂脱脂动力学行为。结果表明,微晶蜡基喂料呈现假塑性流体的剪切稀化特征,对剪切速率和温度的敏感性较为稳定,综合流变性能良好。可溶性粘结剂组元的脱除主要发生在脱脂前期,由扩散所控制,且随着坯体厚度和体积的减小及脱脂温度的升高,扩散系数增大。Microcrystalline wax was mixed with the WC–10Co(YG10)powders to obtain the injection molding feedstocks as the main component of the binders.The non-Newtonian index,viscous flow activation energy,and synthetic rheological factor of the feedstocks were calculated by linear fitting,and the rheological properties of the feedstocks at the different temperatures and shear rates were investigated.The kinetic behavior of the solvent debinding for green bodies was investigated by analyzing the weight loss of the green bodies in the different debinding solvents at the different temperatures.The results show that,the microcrystalline wax based feedstocks exhibit the shear thinning characteristics of pseudoplastic fluid.The feedstocks have the stable sensitivity to the shear rate and temperature fluctuation,and show the good comprehensive rheological properties.The removal of soluble binder components mainly occurs in the pre-solvent debinding stage,which is controlled by diffusion,and the diffusion coefficient increases with the decrease of the thickness and volume of the green body and the increase of the debinding temperature.

关 键 词：金属注射成形 硬质合金 微晶蜡 流变性能 溶剂脱脂 

分 类 号：TF124.3[冶金工程—粉末冶金]