P/M Manufacturing - Basic Process and Advantages

The Basic Powder Metallurgy Process

In conventional powder metallurgy manufacturing, elemental, partially alloyed or pre-alloyed powders are fed into a die, compacted into the desired shape, and ejected from the die. The component is then sintered at a temperature below the melting point of the base material in a controlled atmosphere furnace to form metallurgical bonds between the powder particles. Mixing metal powders in the solid state allows opportunities to engineer material properties unique to powder metallurgy. After sintering, a variety of secondary processes and value-added operations may be performed.

Advantages of Powder Metallurgy

The powder metallurgy process offers a number of advantages over other metalworking processes. The powder metallurgy process:

• Offers net shape capability
• Eliminates or minimizes machining
• Eliminates or minimizes scrap losses
• Maintains close dimensional tolerances
• Utilizes a wide variety of alloy systems
• Produces good surface finishes
• Provides materials that may be machined, heat treated, plated or welded to further improve properties and performance characteristics.
• Provides predictable & consistent porosity
• Enables cost-effective, high volume manufacture of complex or unique shapes impractical with other metalworking processes
• Offers long term performance reliability in critical applications

In addition to these advantages, powder metallurgy permits design engineers to use a number of unique features and shapes, including:

Gear Forms

• Spur
• Involute
• Bevel
• Helical

Unique Shapes

• Splines
• Geometric
• Keys, Keyways
• Eccentric

Detailed Surface Features

• Lot numbers
• Company logo
• P/Ns with revisions

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