CAJ | 학술논문

研究超细98W?1Ni?1Fe 粉末的注射成形。系统研究球磨和硬脂酸(SA)添加对粉末特性以及喂料流变行为的影响。结果表明：球磨和SA添加均有效提高喂料的装载量。SA添加可以避免喂料制备过程中粉末与粘结剂间的表面反应，从而缩短混炼时间。SA添加可以降低喂料的粘度，但这种效果随温度升高而逐渐消失，在125°C以上时变为一种不利的效果。SA添加可以降低注射所需的温度。添加SA的粉末喂料在115°C时具有最低的粘度及剪切敏感性，而未加SA的粉末喂料在135°C时才具有最低的粘度及剪切敏感性。同时，添加SA的粉末喂料相比未添加SA的粉末喂料具有较低的温度敏感性及较佳的综合流变性能，因此，更适合于超细98W?1Ni?1Fe粉末的注射成形。
연구초세98W?1Ni?1Fe 분말적주사성형。계통연구구마화경지산(SA)첨가대분말특성이급위료류변행위적영향。결과표명：구마화SA첨가균유효제고위료적장재량。SA첨가가이피면위료제비과정중분말여점결제간적표면반응，종이축단혼련시간。SA첨가가이강저위료적점도，단저충효과수온도승고이축점소실，재125°C이상시변위일충불리적효과。SA첨가가이강저주사소수적온도。첨가SA적분말위료재115°C시구유최저적점도급전절민감성，이미가SA적분말위료재135°C시재구유최저적점도급전절민감성。동시，첨가SA적분말위료상비미첨가SA적분말위료구유교저적온도민감성급교가적종합류변성능，인차，경괄합우초세98W?1Ni?1Fe분말적주사성형。
Ultrafine 98W?1Ni?1Fe powder injection molding was studied. The influence of ball milling and stearic acid (SA) addition on ultrafine powder characteristics and feedstock rheological behavior was investigated systematically. Results show that ball milling and SA addition can effectively increase powder loading of feedstock. SA addition can also avoid surface interactions between powder and binder during feedstock preparation, thus shortening the mixing time. SA addition is effective in reducing feedstock viscosity, but this effect decreases with increasing temperature and becomes disadvantageous when temperature is higher than 125 °C. SA addition can also reduce the temperature required for injection molding. The feedstock of powder with SA addition gets its best shear stability and lowest viscosity at 115 °C, while the feedstock of powder without SA addition obtains its best shear stability and lowest viscosity at 135 °C. Meanwhile, the former has lower temperature sensitivity and better comprehensive rheology than the latter, so the former is more suitable for ultrafine 98W?1Ni?1Fe injection molding.