Powder metallurgy products refer to metallic materials, composite materials, and various types of components manufactured by processing metal powders (or mixtures of metal and non-metal powders) through processes such as forming and sintering. The following is a detailed introduction to powder metallurgy products:

Main features

High material utilization: Powder metallurgy employs near-net-shape forming processes, typically achieving a material utilization rate of over 95%. Compared to conventional machining, this significantly reduces waste generation.

Capable of manufacturing parts with complex shapes: Using precision molds, it’s possible to press-form parts with intricate structures—such as side recesses, threads, and multi-step features—in a single operation—a feat that is difficult to achieve with traditional machining methods.

Controllable material composition: The pore size and number can be precisely controlled, enabling the fabrication of porous materials such as oil-impregnated bearings and filters. Additionally, different materials can be combined to create composite materials, such as silver-tungsten and copper-graphite for electrical contact materials.

The product exhibits excellent performance: Due to the use of fine powders as raw materials, the product features a uniform internal microstructure with fine grains and no segregation, resulting in superior overall mechanical properties, dimensional stability, and thermal treatment stability.

High production efficiency: The powder metallurgy pressing process is fast and can be highly automated for continuous production, making it ideal for large-scale manufacturing with low per-unit production costs.

Production process

Powder Production: Powder-making methods include mechanical methods and physicochemical methods. Mechanical methods encompass solid crushing and liquid crushing (such as atomization); physicochemical methods include reduction, electrolysis, thermal decomposition, and others.

Molding: The mixed powder is formed into compacted blanks of specific shapes and dimensions. Common molding methods include pressing, as well as pressureless forming techniques such as slurry casting and freeze casting.

Sintering: The formed green compact is placed in a sintering furnace and subjected to high-temperature sintering, enabling metallurgical bonding between powder particles through mechanisms such as diffusion and recrystallization, thereby enhancing the strength of the final product.

Post-sintering treatment: Depending on requirements, the products undergo processes such as pressure working, impregnation, heat treatment, and surface treatment to enhance their performance and precision.

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