Tungsten Powder Compact Principle

Tungsten powder compacts principle is the powder forming process, the powder densified into a certain nature, size, porosity and strength of the green body process. The physical and mechanical properties of tungsten powder are related to the density and strength of green compact. The density and strength of green compact are related to the characteristics of the material such as the morphology and size distribution of tungsten powder.

The process of compaction of tungsten powder has the shape, size and performance requirements of powder compacts. The shape and size of the finished compact of the tungsten powder should be such that the final product will meet the requirements of the drawing. Tungsten powder compacts performance density, strength, qualified tungsten powder compacts should not exist, such as stratification, cracks and other defects.

The pressed green density of the tungsten powder depends on factors such as forming method, pressing pressure, powder properties, lubricant, structure of the stamper and surface finish. The density of the compact requirements should consider the value of the size and distribution of two aspects of uniformity.

By separately weighing the weight of the compacts in the air and the weight of the compacts in the air and in the water after waterproofing, the density of the compacts can be calculated using the Archimedes principle. The strength of the green compact mainly depends on the mechanical meshing between the powder particles and the binding force between the metal atoms on the surface. Increasing the specific surface area of the powder and the roughness of the particle surface, reducing the bulk density, reducing the surface oxidation and pollution of the particles and increasing the density of the green compact can improve the strength of the green compact.

The green strength is determined by pressing 5 rectangular test pieces under specified conditions. Then under uniform conditions under uniform application of transverse force until fracture, calculate the five samples of the transverse rupture strength of the arithmetic mean obtained compacts strength value.

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