What is powder metallurgy ? PM is a metal-forming process performed by heating compacted metal powders to just below their melting points. Although the process has existed for more than 100 years, over the past quarter century it has become widely recognized as a superior way of producing high-quality parts for a variety of important applications. This success is due to the advantages the process offers over other metal forming technologies such as forging and metal casting, advantages in material utilization, shape complexity, near-net-shape dimensional control, among others. These, in turn, contribute to sustainability, making powder metallurgy a recognized green technology.
In reality, powder metallurgy comprises several different technologies for fabricating semi-dense and fully dense components. The conventional powder metallurgy process, referred to as press-and-sinter, was used to produce the planetary carrier shown here. The surgical scissor parts were formed through the metal injection molding (MIM) process, the manifold was manufactured through hot isostatic pressing (HIP), while the connecting rod was produced using powder forging (PF). Meanwhile, new to the scene, metal additive manufacturing (AM) is gaining popularity.
Using many of these PM processing techniques, as well as other processes such as spray forming, roll compaction, rapid solidification, and others, components are also produced today from particulate materials other than metal powders. Today’s advanced materials are seldom made of metals and metallic alloys alone, often incorporating ceramics, ceramic fibers, and intermetallic compounds. These include:
- cermets
- intermetallic compounds
- metal matrix composites
- nanostructured materials
- high-speed steels
Powder metallurgy is an integral part of our lives.
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Source: MPIF
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