The coating material can strengthen or modify the surface of the substrate, so that the substrate has more powerful properties, such as abrasion resistance, corrosion resistance, stability, high temperature resistance, or special properties that the substrate does not originally have, such as conductivity and magnetism. , Optical and insulation properties. Therefore, the development of coating deposition technology is getting faster and faster, and is valued by various industries. As a coating deposition technology, plasma spraying technology is uniquely different from other spraying technologies, because the spraying material sprays a relatively large area, and the thermal shock effect on the workpiece is relatively small, the deposition efficiency is high, and it will not be affected by some special factors The influence of such factors as the area of the substrate and the shape factor can play an important role in various fields.
In fact, plasma spraying is a kind of thermal spraying, which has a unique coating deposition process: metal and non-metal powder are processed at high temperature under the action of high temperature and high-speed plasma beam, waiting for the molten or semi-molten state, and then quickly hit The substrate will gradually solidify on the surface of the substrate, and then a layer of coating will be formed. In addition to its composition, the performance of the coating is also related to the content of internal defects, such as pores formed during the deposition process. The porosity of the coating prepared by plasma spraying technology is generally greater than 5%, which also adversely affects the performance and service life of the coating. To
How can we increase the density of plasma sprayed coatings? Steps are required: first prepare the powder; dry the obtained powder; sequentially degrease, sandblast, clean and dry the substrate; prepare the surface coating, then deposit the dry powder with a plasma spraying equipment, and load the dry powder on the low-frequency vibration matrix material On top, a coating is formed.