Thermal coating materials have the advantages of fast deposition speed, high flexibility, easy automatic processing and strong adaptability. Thermal spraying technology uses heat source to melt the coating material onto the substrate material.
Thermal spraying technology with different methods and uses was born in different years
1910: wire flame spraying technology; Flame spraying of wire rod is widely used to prepare corrosion-resistant and wear-resistant coatings on the surface of mechanical parts, chemical containers and rollers. It can also be used to spray plastic powder after changing the nozzle of spray gun. The arc wire spraying technology in the 1920s has the following characteristics:
(1) The steel components are sprayed with special and aluminum coatings for long-term protection.
(2) Spraying aluminum on steel parts can prevent high temperature oxidation.
(3) Spray stainless steel or other wear-resistant metal on iron and steel parts for wear and corrosion protection.
(4) Apply carbon steel, bronze and other materials on the mechanical parts to repair the parts.
(5) Spray shielding coating on plastic products.
(6) Composite copper plate is produced by arc spraying aluminum or spray casting.
50's explosion spraying and plasma spraying technology: high temperature plasma arc flame, suitable for spraying high melting point materials. The density of the coating can reach 85-98%, the bonding strength can reach 35-70mpa, and the spraying quality is much better than that of flame spraying. Mainly used for:
(1) Wear resistant and anti-wear coating;
(2) Corrosion resistant coating;
(3) High temperature oxidation resistance, high temperature airflow erosion resistance, thermal barrier coating;
(4) Manufacturing metal and ceramic composite materials with high soldering point.
At present, thermal coating has become one of the key technologies of high performance aeroengine manufacturing. In addition, according to foreign statistical reports on the application of high-performance ceramic coating, thermal spraying ceramic coating accounts for two-thirds of the high-performance ceramic preparation market in North America, which is basically consistent with domestic reports that the output value of thermal spraying is about one-third of all the output value of surface technology, indicating that thermal spraying technology has become one of the important surface engineering technologies.
The spray material is melted by heat energy, and then atomized by high-speed air flow. Driven by the high-speed air flow, the particles impact the surface of the substrate and condense to form a functional coating, which is called thermal spraying technology.
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