Plasma Spraying

Product Detail

To force the free ARC ARC "compressed" so that energy is more concentrated, full ionization of gases in the arc column, this arc is known as plasma, plasma arc, also known as compressed arc, it is different from the arc, arc welding the arc of. Because they are not subject to external constraints, they are also called free arcs. Usually improve arc stability by increasing the arc power to solve, but due to the free arc temperature is not high, and average only around 6000--8000K. Tungsten electrode to supply cathode, the nozzle to supply cathode, plasma arc between tungsten electrode and nozzle, in ionic air under pressure, from arc flame sprayed out of the nozzle, forming plasma.

When tungsten and artifacts along with a high voltage and high frequency oscillator excitation, ionization forms arc, arc through a special hole-shaped nozzle, by mechanical compression, small cross-sectional area. In addition, when the arc through a special nozzle cooling with water, because external constantly sent to the cold air and good thermal conductivity of the cooling effect of the water-cooled wall of nozzle hole, the arc is further compressed, resulting in current only from the Center through the arc column, then the arc current density increased dramatically. Due to arc within of with points particles in arc column within of movement himself produced magnetic field of electromagnetic force, makes they Zhijian mutual attract, is electromagnetic contraction effect, results makes arc again further was compression, such was compression Hou of arc energy will height concentrated, temperature also reached very high of degree (about 1--20,000 degrees), arc column within of gas get has height of ionization. When the compression effect and after thermal balance inside the arc, arc turned into stable plasma arc. Arc between tungsten electrode and the work piece and nozzle temperature of anode spots in the workpiece near the heights of up to 30,000 degrees.

Spray characteristics:

Main spraying high melting temperature of metallic powder, ceramic metal powder, high wear resistance of the workpiece after spraying, insulation, good heat resistance, spray deposition and good workpiece deformation of the body itself does not feature.

Scope of application:

Medium temperature and medium pressure hydraulic valves, hydraulic support rods, intake valves, valves of internal combustion engine, a boiler in a steam valve, mechanical seals, hot tools, etc.