Something you should know about thermal barrier coatings

Thermal barrier coating is mostly studied in thermal spraying technique, and it’s one of the most important coatings which with most development potential.

Usually, thermal barrier coating works in a high temperature9(above 1000℃）)environment, the thermal barrier coating is a "Laminated" type, metal and ceramic composite coating

Which is composed of metal buffer layer and thermal protection ceramic functional coating which with good heat resistance and thermal insulation. Work coating of surface ceramics are combined with high temperature alloy substrate recur to the metal bonding layer between substrate and ceramic coating.

The bonding layer has good adhesion with surface ceramic layer and basis metallic material, and with excellent high temperature resistance and oxidation resistance, thermal expansion coefficient between base metal and surface ceramic layer, it can improve heat matching between ceramic and metal materials, reducing interfacial stress, and improving the boding strength, thermal shock resistance and operating life.

Preparation of thermal barrier coating is usually sprayed with plasma spraying process, HVOF flame spray coating technology is more suitable for functionally Graded thermal barrier coatings. YSZ is the most practical ceramic materials for preparation of thermal barrier coatings, usually, bonding materials are alloy materials of MCrAIY.  Based on some correlational studies, except the choosing of materials, the structure design of coating is also an important factor which affects practical performance of thermal barrier coating. 

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