In plasma spraying, the coating material is heated and melted by a certain heat source, and atomized into very thin particles by a high-speed air flow. And high-speed spraying on the surface of the workpiece to form a coating. Depending on the hardness of the coating, thermal spray alloy powders can be divided into nickel-based, iron-based and cobalt-based alloy powders for repairing and protecting mechanical components. It can make mechanical parts have wear resistance, corrosion resistance, oxidation, heat resistance and other properties.
The problems that should be paid attention to in the plasma thermal spraying treatment are as follows.
1. Heating paint, amino drying paint, phenolic blend paint, nitro paint, X-622 epoxy paint and PVF paint must be used.
2. Draw the paint temperature 1 and a degree curve in advance, and choose the appropriate temperature.
3. Be careful when choosing a thermosetting paint for thermal spraying, because during heat transfer or heating cycle, it is easy to cause a thermal curing reaction, which thickens and gelatinizes the paint.
Therefore, the heating temperature must be much lower than its thermal curing reaction temperature. The above amino coatings and X-622 epoxy coatings are thermosetting coatings. The thermal spraying temperature of amino paint should be around 60℃, while the thermal spraying temperature of X-622 epoxy paint should be lower than 80℃.
4. For electric heating, the power supply voltage shall not exceed the rated voltage of the heater.
5. When the electric heating circuit is uncoated, the power supply cannot be controlled.
6. Before installing the oxygen cylinder, the oxygen valve should be slightly opened (functions: stop, diversion, pressure stabilization, diversion, etc.. Remove dirt and prevent dust and garbage (garbage) from clogging the pressure reducer and causing accidents.
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