Vacuum system for plasma spraying is a process in which plasma-enhanced coatings can be coated on the surface in vacuum. This vacuum plasma spraying process can change some characteristics of the surface, but the carrier material will not change. The vacuum system is applied to plasma spraying when the volume of the vacuum chamber is 19 000 liters. Why should vacuum system be used in plasma spraying?
Plasma spraying is a technology of surface strengthening and surface modification of materials. It can make the surface of matrix have the properties of wear resistance, corrosion resistance, high temperature oxidation resistance, electrical insulation, heat insulation, radiation protection, wear reduction and sealing. Plasma spraying technology is a method of using plasma arc driven by direct current as heat source, heating ceramics, alloys, metals and other materials to melt or semi-melt state, and spraying at high speed to the surface of pre-treated workpiece to form a solid surface layer. Plasma spraying is also used for medical purposes. A coating of tens of microns is sprayed on the surface of artificial bones as a method of strengthening artificial bones and enhancing their affinity.
What is plasma spraying
Vacuum plasma spraying is a technology of spraying in a sealed chamber with controllable atmosphere of 4-40Kpa. Because the working gas is plasma ejected at the expansion volume in a low pressure atmosphere, the jet velocity is supersonic, and it is very suitable for materials highly sensitive to oxidation.
The technically required plasma spraying system coating process requires a double-wall water-cooled vacuum chamber. The parts to be coated are placed inside, and then the processing room is closed. The vacuum system discharges the chamber at a pressure of 0.08 millibars. This ensures that the oxygen in the atmosphere and the water vapor attached to the components are completely evacuated without any negative impact on the components. This also creates conditions for producing extremely pure gas environment. Then, the pressure of the treatment chamber and argon gas will be refreshed to 100 millibars, and then further evacuated to 1 millibars.
The actual coating will start only when the process gas mixture enters and the plasma burner is turned on. This is customized for individual coatings and materials. The coating is mainly affected by energy input, gas and gas mixture used, temperature, coating time and pressure level of a single process step.
At present, the vacuum system is mainly active in the field of medical technology. Vacuum plasma spraying process creates biocompatible coatings for implants and provides the best conditions for the growth of bone cells. The application of vacuum system in plasma spraying can create the best production conditions and environment for many industries. It is believed that there will be greater development in the future.
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