Thermal spray techniques are classified according to its heat source and shape of selected materials. Nowadays, thermal spraying technology mainly include plasma spraying, arc spraying, flame spraying and so on.
Plasma spraying
Plasma spraying is widely used due to it can spray many kinds of materials, process is relatively simple, and good combination of coating and matrix. The main obstacle to obtain high quality coating of plasma spraying is that the complicated control of the large number of related parameters of spraying process. One of the main aspects of the past research is to improve the performance of thermal spray equipment,
The present study is the process of coating formation, including combination between the coatings, combination of coating and substrate, porosity, not-melt particle control and so on. The ultimate goal of these studies is that led to the whole process control and automation of plasma spraying.
Arc spraying
Arc spray is an economic and reliable thermal spray technology, generally speaking, spraying material is limited to metals and alloys, spray on a variety of substrates. Its applications include wear-resistant coating, structure anticorrosion coating and wear parts repair, etc, and it may also be applied to seal field in the future. The current research focus on how to realize the automatic control of spraying process.
The traditional flame spraying is made of combustible gas combustion flame as a heat source, heating the flame spraying powder to melt and spray on the substrate surface. High speed oxy-fuel spraying (HVOF) is one of the main flame spraying technology.
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