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The basic concept of thermal spraying

Author: langfeng Time: 2017-08-01

The basic concept of thermal spraying

2.1 definitions
Thermal spraying is a process that the original series of: in some form of heat source to heat spraying materials, the heated material forming molten or partially molten state of particles, the particles at a certain speed impact and deposited on the substrate surface, forming has certain characteristics of the spraying layer.
2. 2 coating material
Materials for spraying powder, wire, tape and different forms, such as, their composition is metal, alloy, ceramic, metal, ceramic and plastic, etc. Powder material in the important position, species more than one hundred kinds. Wire and strip for metal or alloy (composite wire is containing ceramic or plastic); Only a dozen bar, oxide ceramics.
2.3 spraying method
In order to provide the different heat source, can be divided into combustion method and electric heating method. The former includes the combustion flame spraying, explosion spraying and high-speed flame spraying (HVOF); The latter including electric arc spraying and plasma spraying (and atmospheric plasma spraying and water stable plasma spraying). Important influence on coating spraying process, the spraying humidity (strictly speaking, is the drop impact the temperature of the substrate surface) and on the surface of the drop impact speed.
 
2.4 the formation of the coating and its evaluation
Spraying materials after spraying equipment with a heat source, form injection, before reaching the by spraying the surface of the substrate, the flight time only a few thousand a fraction of a second or less. In such a short period of time, it is heating, melting or half melted, the small and dispersed droplet formation, ran to the substrate surface, be into flat folding shape small pieces, and the previously generated flat piece and is covered by the successor, quickly formed by many flat fold into the cover, is the spray coating. The higher heat humidity, drop impact velocity, the greater the formation of the coating is more dense. Coating performance is associated with many factors.
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