High velocity compaction technology belongs to dynamic pressing forming, which is a technology of forming powder with the speed that is obviously higher than the traditional technology. Its pressing speed is 2-30m/s, and the dynamic pressure is rapidly formed and densified by the propagation of shock wave or stress wave in the powder.

Warm compaction can improve green density and strength. It is generally believed that the densification mechanism of warm compaction is particles re-arrangement and the plastic deformation.

Warm compaction has great advantages in manufacturing low cost, high density, high strength, high precision and complicated complex parts. As a result, it has a broad application prospect in the preparation of tungsten carbide. 

The primary task of developing the new warm compaction technology is to select or develop a suitable polymer additive, which can be used as a binder / lubricant. For the tungsten carbide powder, the selected polymer needs certain characteristics, such as low vitrification temperature, easily soluble in volatilization agent and so on. Main entry modes of polymer are dry mixing, wet mixing and so on.

The green compact strength of the tungsten carbide billet is an important parameter of the pressed shape, which can be enhanced by two ways during warm compaction. The first way is to increase the density of the blank by the compacted temperature and pressure, and the two is to affect the polymer itself and its action with the powder particles by the heating temperature.

Earrings can be divided into ear chain, ear nail, and ear drop, etc. Women love to wear earrings, for it can make them looks more beautiful and charming.