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采用高能球磨技术制备了高氮节镍不锈钢近球形复合粉末,与石蜡基多聚合物组元黏结剂混炼制成金属注射成形喂料,研究了注射喂料的黏度、剪切速率以及温度等对黏度的影响。结果表明:高能球磨能够显著改善高氮不锈钢粉末的工艺特性,球磨60 h得到的粉末颗粒细小,球形度较好,振实密度高,适合用来制作高质量的金属注射成形喂料。其中,粉末装载量为58%的喂料应变敏感因子最小(n=0.45),粘流活化能最低(E=28.70 kJ/mol),综合流变学因子最大(αSTV=2.96),表明该喂料具有最好的综合流变性能,非常适宜进行后续注射成形工艺。
High-energy ball milling technology was used to prepare high-nitrogen nickel near-spherical stainless steel composite powder, and paraffin-based multi-component polymer binder made of metal injection molding feed, the viscosity of the injection feed, the shear rate and temperature Effect on viscosity. The results show that high energy ball milling can significantly improve the process characteristics of high nitrogen stainless steel powder. The powder particles obtained after ball milling for 60 h are fine, sphericity is good and the tap density is high, which is suitable for producing high quality metal injection molding feed. Among them, the strain response factor of 58% powder loading was the lowest (n = 0.45), the lowest was the activation energy of viscous flow (E = 28.70 kJ / mol) and the largest was the comprehensive rheological factor (αSTV = 2.96) The material has the best comprehensive rheological properties, is very suitable for subsequent injection molding process.