P/M (Powder Metallurgy) involves the use of metal powders in industrial applications with the primary utilization being the net shape manufacture of parts. P/M represents the fastest growing sector in manufacturing as several techniques are competitive with investment casting, discrete machining, and can produce materials not possible via traditional manufacturing methods. However, P/M methods are not fully realized in the jewelry manufacturing industry.

This paper will present an overview of the science of P/M and many of the P/M technologies that are well developed in industry including press and sinter (P&S), metal injection molding (MIM), hot pressing, hot and cold isostatic pressing, roll compaction, extrusion, and fusion processes (braze and solder pastes, thermal spray and spray forming). A review of the current status of P&S and MIM in jewelry manufacturing will be presented as well. This presentation of alternative manufacturing methods using P/M may seed some ideas for potential P/M applications in jewelry manufacturing.

Author: Dr. Joseph Tunick Strauss