| Popis: |
The method of microplasma spraying provides a small size of the spraying spot (a few millimeters), is characterized by small dimensions of relevant equipment and a low level of noise. A plasmatron with a device for feeding a wire has been designed to use wire as a material for coating spraying. Experiments on microplasma spraying of coatings were conducted using molybdenum, tungsten, titanium, nichrome, copper, brass, tin, aluminum, steel and stainless steel wires. The use has been made of wires with a diameter of 0.2-0.4 mm. Relationship between the wire material and diameter at a wire feed speed ensuring optimal conditions of the spraying process has been established. Structure and properties of coatings produced by the microplasma wire spraying method have been studied. Results of the studies are indicative of the possibility of thus producing the dense coatings at a spraying spot size of 3-8 mm. |
