High Heating Temperature Powder Manufacturing Equipment Fast Cooling Speed

Overview

Radio-frequency plasma torch possesses high energy density, strong heating strength, and its plasma arc is huge. Due to no electrodes available, it can not generate polluting products caused by electrode vaporing.

The principle of radio-frequency plasma powder balling technology refers to that inert gas (like argon) is ionized under the effect of high-frequency power supply and formed as hot inert-gas plasma; and the irregular raw powder is sprayed by vector gas (nitrogen) into the plasma through powder feeding device, and these powder particles absorb large amount of heat in hot plasma and their surfaces are melted rapidly; then these melted powder are sent into reaction device by extremely high speed, and chilled down under inert gas environment. Consequently, they are cooled down and solidified into spherical powder by surface tension; furthermore, they are sent into material gathering room and are gathered.

Features

1. Heating temperature is high, cooling speed is fast, and no electrode pollution is produced;

2. Reaction materials are dynamically dispersed in plasma torch, in this way it can avoid the accumulation and growth of powders, and it is applied to melting and balling of powder particles;

3. It is applied to preparation of hard-melted metal and oxide powders in high temperature, such as W, Mo, Ti, W, WC, Al₂O₃, silicon oxide, zirconia and so on;

4. The shape of powder is regular, its balling rate is high, the surface is bright and clean, and also has good flow-ability; The compactness and accumulation density of powder are increased.

Core Module Structure Technology

Radio-frequency plasma torch balling powder producing equipment is constructed with following seven components and peripheral components:

1. Radio-frequency plasma torch;

2. Radio-frequency plasma power supply;

3. Gas supplying and powder feeding system;

4. Reaction room and collection room, frame as well;

5. Vacuum pumping system;

6. Electric controlling and measuring system;

7. Cooling water machine unit.

Radio-frequency plasma torch:

It is the core key technology of the entire equipment, possessing proprietary intellectual property right. And it applies ceramic constraining pipe and divergent nozzles, allowing its performances under inert gas, reduction and oxidation environment.

High-frequency plasma power supply:

Power 100KW, frequency 3.0±0.5MHz.

Gas sending and powder feeding system:

Powder feeding device adopts an imported product made by Canadian TEKNA Company, and it sends powder material into plasma torch. The diameters of sent powder particles are 10-200µm; on the other hand, gas supplying system applies precise float flowmeter (4 road), providing working gas (argon) for the torch. Reaction room, gathering room and frame: reaction room and gathering room utilize double-layer water cooling structure, and they are made of stainless steel, entirely adopting vacuum sealing pattern; the frame is spray-painted by carbon steel, partial materials are aluminum alloy which are strong, hard, steady and safe.

Air pumping system:

It is equipped with water-circulating vacuum pump + mechanical pump + lobe pump + regulating valve + pipes + corrugated bellows, and switched to maintain required loading voltage for booting the system its operation. Extreme vacuum is 8 x 10^-2Pa.

Electric controlling and measuring system:

Temperature and pressure measurement, regulation on filter back flushing, powder sending control, and gas flow.

Industrial cooling water machine unit:

30P, adopting air cooling pattern and providing clean cooling water for power supply and plasma torch.