Replication of metal microstructures by micro powder injection molding

In this paper, a study on the production of 316L stainless steel microstructures by muPIM (powder injection Moulding) is presented. Two types of mold inserts were used and the moulding was conducted on a conventional injection moulding machine. Based on the characteristics of the mold inserts and the feedstock, suitable processing parameters were selected. Some requirements for the production of the microstructures are discussed. For example, a relatively high mold temperature, high injection pressure and holding pressure were required. The Study showed that 316L stainless steel microstructures of phi100 x 200 mum can be injection molded, but there were incomplete filling and demoulding problem in the case of smaller microstructures of phi60 x 191 mum. The molded parts were successfully debound and sintered. (C) 2004 Elsevier Ltd. All rights reserved.