New developments in powder metallurgy
Journal Article
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· Advanced Materials and Processes
OSTI ID:105925
This article highlights some of the papers presented at the 1995 International Conference on Powder Metallurgy and Particulate Materials sponsored by the Metal Powder Industries Federation May 14--17, 1995, in Seattle. The first truly new process to produce WC-Co powders in the industry`s 70-yr history was described. A new binder with higher resistivity and greater compressibility than earlier binders has improved the performance of microencapsulated powders in both electrical and structural applications. Nitrogen is added under high pressure to some stainless steel alloys to achieve high strength, but this can be expensive because of the equipment required to melt the steel under pressure. A mathematical model was described for the densification of prealloyed powders by supersolidus liquid phase sintering, as a function of process parameters such as temperature, heating rate, liquid-wetting behavior, powder microstructure via liquid nucleation sites, mean liquid film thickness, and grain size. Many secondary processes are used to compress and form powder metal components to full density after sintering. It was suggested that ausforming--forming at temperatures above the martensitic start temperature, but below temperatures that could allow significant diffusion--could produce exceptionally tough, hard surfaces combined with nearly full density. Stainless steels made from prealloyed powders typically have had poor corrosion resistance. It may be that this poor performance is a result of high oxygen content in the stainless steel powders.
- OSTI ID:
- 105925
- Journal Information:
- Advanced Materials and Processes, Journal Name: Advanced Materials and Processes Journal Issue: 3 Vol. 148; ISSN 0882-7958; ISSN AMAPEX
- Country of Publication:
- United States
- Language:
- English
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