Tungsten Copper Power Warm Compacting Process — Key Technologies(1/2)

Warm compacting process is a kind of new process of high precision powder metallurgy that develops based on conventional molding process. Compared with conventional process, warm compacting process is in the process of pressing the powder in a conventional method and the mold is heated to a certain temperature after pressing to obtain high-density powder compact, which achieves sintered body with high density and high performance. Warm compacting process can be suitable for whether iron-based materials or tungsten (W), copper (Cu), aluminum (Al) and other metal powder, which has many advantages, such as higher compacting and sintering density, uniform distribution, higher compacting strength, lower releasing pressure, lower spring back and cost. The influencing factors include the powder (apparent density, the granularity, the content and porosity, etc.), the choice of lubricant, the temperature and other parameters controlling, which are the key technologies to ensure the molding process. Next, we will discuss the key technologies of tungsten copper composite powder warm compacting process according to the aspects above.

1. Powder: The choice of powder includes that the granularity, the content, apparent density, the porosity and so on. Tungsten-copper composite powders for warm molding not only require good compressibility in heating, transport and pressing process, liquidity and stability constant bulk density, and require consistency between the performances of the parts made of It is also high. Particle size, size distribution and powder itself mixed powder formulations are to some extent determines the density of the material and non-porosity. Related foreign researchers developed a patented powder, heated at 130 ℃ to either incubated or in powder 130 ℃ under cooling to room temperature, warming cycle effect, the powder flowability and bulk density as well as 600MPa by pressing the blank density are very stable.

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