Plasma spraying technology is one of the thermal spraying technologies in surface engineering. Its main feature is that plasma flame is used as spraying heat source. Due to the characteristics of high temperature, concentrated energy and controllable spraying atmosphere, plasma flame is a good heat source for all kinds of refractory materials, and the flying speed of powder materials in the flame is very high, so it provides conditions for obtaining spray coating with good combination and compact structure.
The process characteristics of plasma spraying are as follows
(1) The substrate is little heated, the parts are not deformed, and the heat treatment state is not changed.
(2) A wide range of materials and coatings can be sprayed.
(3) The process is stable and the coating quality is high.
Application of plasma spraying technology:
With the development of aeroengine to high performance, high repair life, high reliability, low fuel consumption and low cost, thermal spraying technology has also been developed rapidly. A new engine has more than 3000 surfaces of thousands of parts, which need to be coated by thermal spraying technology. It can be seen that thermal spraying technology has been widely used in aviation industry. Among them, plasma spraying has many advantages, such as low cost, high efficiency, simple operation, good coating quality and suitable for large-scale mass production, which has accounted for more than 80% of all spray parts of aero-engine.
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