How to use the raw materials of plasma spraying?

       

The raw material plasma used in plasma spraying can be divided into three categories: nuclear fusion research uses high temperature and high pressure plasma, with an ionization degree of 100% and a temperature of hundreds of millions of degrees; low temperature and low pressure plasma ionization degree is less than 1%, and the temperature is only 50-250 ℃ ; In high temperature and low pressure plasma, more than 1% of the gas is ionized, and the temperature reaches tens of thousands of degrees

The kinetic energies of ions, free electrons and unionized atoms are close to thermal equilibrium. This plasma is used in thermal spraying. Compared with the free arc, the ion arc is a constriction arc. Compared with the free arc, it has the characteristics of thin arc column, high current density and high gas ionization degree.

 

What are the plasmas used in plasma spraying? And we can start spraying according to some different voltage connection methods. When different voltage methods stop, there are three types of ion arcs used in plasma spraying under normal conditions: non-transferred arc: refers to the plasma arc generated between the cathode and the nozzle.

 

In this condition, the positive pole is connected to the nozzle, and the workpiece is not charged. An arc is created between the cathode and the inner wall of the nozzle. The working gas is heated by the arc between the cathode and the nozzle, causing total or partial ionization, which is then ejected from the nozzle to form a plasma flame (or plasma jet). This plasma arc is used for particle spraying.