Thermal spraying method - plasma spraying process

       【Summary】:

Plasma spraying uses a plasma flame as a heat source to heat the sprayed material. The plasma used in plasma spraying is a conductive gas composed of atoms, molecules, ions and electrons of electric ions. When atoms in a gas are excited to higher energy levels, these atoms release electrons and become positively charged ions, forming a conductive gas. Plasma spraying is generally sprayed in an atmospheric environment. In order to avoid oxidation of the spraying material, it can also be carried out in a vacuum chamber filled with low-pressure protective gas, which is called vacuum plasma spraying, but the beam density in vacuum plasma spraying is low, so the transfer rate of thermal energy and kinetic energy is reduced.

Plasma spraying uses a plasma flame as a heat source to heat the sprayed material. The plasma used in plasma spraying is a conductive gas composed of atoms, molecules, ions and electrons of electric ions. When atoms in a gas are excited to higher energy levels, these atoms release electrons and become positively charged ions, forming a conductive gas. Plasma spraying is generally sprayed in an atmospheric environment. In order to avoid the oxidation of the spraying material, it can also be carried out in a vacuum chamber filled with low-pressure protective gas, which is called vacuum plasma spraying, but the beam density in vacuum plasma spraying is low, so the transfer rate of thermal energy and kinetic energy is reduced, and the spraying effect is high. Materials with a melting point are disadvantageous. The biggest advantage of plasma spraying is that the flame temperature is high, and the spraying material is suitable for a wide range of applications, especially for spraying high melting point materials. The density of the plasma sprayed layer can reach 85%-98% of the theoretical density, the vacuum spraying can reach 95%-99.5%, the bonding strength is also high (35-70MPa), and there are fewer inclusions in the coating, and the spraying quality is much better than Flame spray coating. The spray quality is far superior to flame spray coatings. The spray quality is far superior to flame spray coatings. The spray quality is far superior to flame spray coatings. The spray quality is far superior to flame spray coatings.