金属注射成形17-4PH不锈钢脱脂保形性研究

Compact Shape Retention for Metal Injection Molding 17-4PH Stainless Steel

摘要:

研究了粘结剂配方，粉末装载量，喂料热力学性质，注射成形工艺等多个因素对金属注射成形17-PH不锈钢脱脂保形性的影响。结果表明具有较高热分解温度，较低熔解热的HDPE作为第2组元的蜡基粘结剂，具有比采用EVA为第2组元的粘结剂更好的保形性能。试样变形率随着粉末装载量，注射压力，注射温度的增加而下降，而且存在一最佳的工艺条件，包括粉末装载量，注射压力，注射温度，此时试样最不容易变形，试样变形比例最小。

Abstract:

The effects of the binder composition, powder loading, thermal properties of feedstocks, and the injection molding parameters on the compact shape retention for metal injection molding 17-4PH stainless steel were investigated. HDPE is more effective as a second component of the wax-based binder to retain compact shape than EVA due to its higher pyrolytic temperature and higher heat of fusion. The compact distortion decreases with the increase of powder loading, molding pressure and molding temperature. There exists a best process condition, including powder loading, molding pressure and molding temperature. Under this process condition, the lowest percentage is there of distorted compacts.