Effect of powders and binders on material properties and molding parameters in iron and stainless steel powder injection molding process
Effect of powders and binders on material properties and molding parameters in iron and stainless steel powder injection molding process
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DOI：
10.1016/j.powtec.2009.03.010
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发表时间：
2009-07-25
影响因子：
5.2
通讯作者：
German, Randall M.
中科院分区：
文献类型：
--
作者：
Ahn, Seokyoung;Park, Seong Jin;German, Randall M.
为了开发成功的粉末注射成型工艺，必须研究和优化多个目标函数，如粘结剂系统设计、进料、零件几何形状、模具设计和工艺条件。对具有不同粘结剂体系组合的粉末和具有不同粉末体系组合的粘结剂体系进行了实验和模拟相结合的研究。首先，通过实验流变学研究了粉末/粘结剂组合对碳化铁和不锈钢粉末注射成形(PIM)原料的流变性和热稳定性的影响。第二，基于原料的表征。模拟研究表明，在所研究的颗粒属性范围内，壁面剪应力、注射压力和夹紧力等与压力相关的参数主要取决于粘结剂体系，而与粉末特性关系不大。第三，对于熔体前沿温差、冷却时间等与温度相关的参数，粘结剂的选择比粉末的选择更为关键。第四，对于与速度相关的参数。为了保证最大剪切速率，粉末和粘结剂系统的选择在控制中至关重要。研究表明，在PIM的发展阶段，仿真研究是必不可少的。爱思唯尔出版公司(Elsevier B.V.)
It is essential to study and optimize multiple objective functions such as binder system design, feedstock, part geometry, mold design, and processing conditions in order to develop a successful powder injection molding process. A powder with different combinations of binder systems and a binder system with different combinations of powder systems were investigated with a combined experimental and simulation study. First, an experimental theological study was performed to evaluate the influence of the powder/binder combinations on the rheological behavior and thermal stability of carbonyl iron and stainless steel powder injection molding (PIM) feedstocks. Second, based on the characterization of the feedstock. the simulation study revealed that the pressure-related parameters such as wall shear stress, injection pressure, and clamping force were mainly dependent on the binder system and not much on the powder characteristics, in the range of particle attributes studied. Third, to the temperature-related parameters such as melt front temperature difference and cooling time, binder selection is more critical than powder selection. Fourth, for the velocity-related parameter. maximum shear rate, the selection of both powder and binder system is critical in control. It is demonstrated that the simulation study is essential in the development stage for successful PIM. Published by Elsevier B.V.