The thermal properties of coatings include coating heat resistance, thermal life, thermal insulation and thermal shock resistance. The main thing is heat resistance and heat insulation, which are two different properties, and their mechanisms and testing methods are both related and different.
Coating Heat Resistance
The heat resistance of the coating is mainly determined by the melting point of the coating material and the porosity of the coating. Because in addition to the melting point, the heat resistance of the coating should include the oxidation resistance of the coating material itself and the ability of the coating to protect the substrate from high temperature oxidation, and the ability to protect the substrate depends on the coating material, coating thickness and porosity. Rate. (Related instruments: Fineness Meter, Thickness Gauge)
As heat-resistant spraying materials, metals, alloys, and ceramics can be used. Usually, various heat-resistant alloys are the main ones, followed by high melting point metals such as tungsten and molybdenum, as well as alloy-based or cobalt-based superalloys, various ceramics, oxidized pins, oxidized diamonds, etc. In addition, carbides, borides and cermets of many high melting point metals can also be used as heat-resistant materials.
