TiH2粉注射成形用新型粘结剂的研制及其性能

研发了一种适合TiH2粉注射成形用新型石蜡基粘结剂,对粘结剂组元间的相容性进行了计算,并分析了该粘结剂的流变性能和脱脂性能。结果表明:该新型粘结剂各组元相容性好,能够与TiH2粉实现良好混合,装载量(体积分数)达到70%以上;粘结剂流变性能佳且稳定,在注射温度为160℃和剪切速率为125s-1的条件下,黏度为0.081Pa.s,粘流活化能为36.85kJ.mol-1;与常规石蜡基粘接剂相比,在同样工艺条件下使用正庚烷脱脂时相同时间下脱脂率提高20%～30%;脱脂坯缺陷少、保形性好;与原料粉相比,经过热脱脂后坯样的碳含量仅增加了0.02%,氧和氮含量均降低。

Development and Performance of New-Style Binder Used for TiH2 Powder Injection Molding

A new-style wax-based binder was developed to use for TiH2 powder injection molding,the compatibility between binder components was calculated,and the rheological and debinding properties of the binder were analyzed.The results show that the compatibility between new-style binder components was good for mixing with TiH2 powders,and the loading of TiH2 powders was over 70vol%.Rheological performance of the binder was good and stable,its viscosity and viscosity fluid energy was 0.081 Pa·s and 36.85 kJ·mol-1 under the conditions of 160 ℃ and shear rate of 125 s-1.Compared with ordinary wax-based binder,the debinding ratio of new-style binder increased by 20%-30% during the same time when normal heptane was used for debinding under the same process conditions.Skim billets presented little flaws and good shape-holding.Compared with raw powders,the carbon content after thermal debinding increased by 0.02% only,and oxygen and nitrogen contents reduced.