粉末注射成形钛合金溶剂脱脂过程研究

Research on Solvent Debinding Process for Titanium Alloy Injection Molded Compacts

研究粉末注射成形(PIM)Ti-6Al-4V注射坯的溶剂脱脂行为,分析了脱脂温度、溶剂种类、注射坯形状对脱脂率的影响。结果表明,脱脂温度对注射坯的溶剂脱脂行为影响显著,随着脱脂温度的升高,脱脂率增加;而注射坯的形状对脱脂率的影响不显著。通过对溶剂脱脂动力学分析表明,正庚烷的活化能为40.39 kJ.mol-1.K-1,大于二氯甲烷的活化能(38.41 kJ.mol-1.K-1);在相同温度下,正庚烷的扩散系数高于二氯甲烷的。

The solvent debinding process of titanium alloy compacts injected by powder injection molding（PIM）was studied.Effects of debinding temperature,solvent,shape of green parts on binder removal were investigated.The results showed that temperature was the dominant parameter,debinding rate would increase with temperature increase;However,the effect of green parts＇shape on debinding rate was not significant.The diffusion active energy of normalheptane is 40.39 kJ·mol-1·K-1,which is higher than methylene chloride（38.41 kJ·mol-1·K-1）,The diffusion coefficient of normalheptane is higher than methylene chloride under the same temperature.