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Thermal spray coating methods'definition and technology functions(二)

Author: langfeng Time: 2017-07-24

 

Thermal spray coating methods'definition and technology functions(二)

2 Basic Concepts 
2.1 Definitions 
Thermal spraying is a series of processes such original: a heat source in a form of coating material is heated, the heated particulate material to form a molten or semi-molten state, the particles impact at a certain speed and deposited on the substrate surface, formation of a certain characteristic the sprayed layer. 
2. 2 spray material 
Powder coating materials have different forms, lines, rods, etc. and with their component metals, alloys, ceramics, cermets and plastics. Powder material occupies an important position, over a hundred kinds of species. Multi-wire and strip metal or alloy (composite wires still contain ceramic or plastic); bars only a dozen, mostly oxide ceramics. 
2.3 spraying 
To provide a heat source can be divided into combustion and heating method. The former includes the combustion flame spraying, explosive and HVOF spraying (HVOF); latter includes arc spraying and plasma spraying (and sub-atmospheric plasma spraying and plasma spraying water stability). Significant impact on the coating process is spray coating humidity (strictly speaking, the temperature of the droplet impact on the substrate surface) and the surface of the droplet impact velocity. 
2.4 coating formation and evaluation 
After the coating material spray device having a heat source in the form of injection, before reaching the surface of the substrate to be coated, the flight time of a few thousandths of a second or less. In such a short time, it is heated, melted or semi-melted to form a dispersion of fine droplets and, toward the substrate surface, a flat stack of shot-like small pieces of flat sheet previously generated and was subsequently covered by , soon formed by a number of stacked flat Lo formed coating layer is sprayed layer. Heat and humidity, the greater the impact of the droplet velocity, the more dense the coating is formed. Coating performance and many other factors. 
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