1. Introduction
Metal powder atomizing equipment is characterized by small environmental pollution, high degree of ball-shape powder, low oxygen content and fast cooling rate and so on. Through many years’ constant innovation and improvement, our company has updated our gas atomization powder-manufacturing technique and technology several times in order to produce metal and alloy powders of high performance. Currently, the technology has become the leading factor to support and promote atomization powder-manufacturing equipment, new material research and new technology development.
The operating principle of atomizing equipment refers to the powder-manufacturing process that smelting metal or alloy under certained condition with metal liquid poured obliquely to heat preservation crucible flowing out through liquid diversion mouth (downward), and takes advantage of the high pressure gases of nozzle to crush metal liquid into large amounts of fine and small liquid drop; The flying liquid drops solidify into ball-shape or sub ball-shape particles and thus complete the whole powder-manufacturing process.
2. Features and parameters
I. Metal powder atomizing equipment has the following features:
1.1 Meeting the requirements of manufacturing metals and its alloy that can not manufactured by water atomization.
1.2 Manufacturing ball-shape or sub ball-shape powder.
1.3 Manufacturing numerous special alloy powders for overcoming aliquation due to fast solidification.
1.4 Adopting suitable processing method to make the powder’s particle reach the required range.
Structure and Composition of metal powder atomizing equipment
The metal powder atomizing equipment mainly contains the following parts: Medium frequency smelting furnace(10kg, 25kg, 50kg, 100kg, 200kg), holding furnace, (10kg, 25kg), atomization system, atomization tank, powder and dust collecting system, gas supply
system, water cooling system, control system, medium frequency power source, holding furnace power supply system(10kg, 25kg level ones are not equipped with holding furnace) and so on.
3.1 Induction smelting furnace:
It is a multi-function induction smelting furnace in fact. It is composed of furnace body, furnace cover, elevation mechanism, temperature measuring mechanism, induction coil, tilting furnace mechanism. The induction coil is the core of the smelting and matches the intermediate power; the crucible is located in the induction coil and it can pour and cast with electricity; the tilting mechanism(10kg, 25kg level ones are equipped with manual casting) is connected with hydraulic and the casting speed can be controlled by the hydraulic proportional valve.
3.2 Holding furnace:
The holding furnace is a metal liquid container located on the spray nozzle system and has the insulation function. It is smaller than the crucible of smelting system with slender body to ensure the metal liquid’s pressure energy. The holding furnace has heating system and temperature measuring system. The heating system of holding furnace is divided into two types of resistance heating and induction heating. The resistance heating can reach 1200C, while the induction heating around 1900C. However, user have to choose the suitable crucible material. There are two choices of holding furnace’s power supply. The resistance heating one is heavy current power regulator and the induction heating one SCR medium frequency power supply.
3.3 Atomization system:
It is made of spray nozzle, high pressure windpipe, valve and so on.
3.4 Tank(Atomization chamber):
Actually it is a container that could connect all the devices according to the requirements. It is space for condensation of metal liquid drops. The internal wall is stainless steel and the external wall is carbon steel and the size of the tank is related to the powder manufacturing requirements and capcity.
3.5 Powder and dust collection system:
During the powder-manufacturing process, there are especially fine powders flying through the pipeline along the high speed air current. It has the secondary collection function when going through the equipment and achieves the effect of reduced environmental pollution and consumption of materials. At present the colleting is processed through cyclone separating device and water phase collection.
3.6 Hydraulic system:
The system mainly provice hydraulic power to the tilting of the device and elevation of the furnace cover.
3.7 Gas supply system:
It consists of intelligent valve, pressure control valve, pressure-reducing valve, pressure sensor, high pressure hose and
pressure indicator. Adopting the intelligent system, the operating personnel can adjust the gas supply pressure of atomization nozzle online at any time during long distance operation and record with PC for later reference and research in order to acquire the precise powder-manufacturing operation technique. The system can also be optional, divided into manual control and automatic control.