Ceramic materials are generally characterized by high hardness, high melting point, thermal stability and chemical stability, which can be used as a coating to effectively improve the wear resistance, high-temperature resistance, high -temperature oxidation, heat resistance and corrosion resistance of matrix materials, and some of these characteristics can be obtained by the proper selection of materials.
Oxide ceramic is a fairly common ceramic coating material which has a lot of kinds, besides the alumina ceramic and zirconia ceramics that is familiar to us, titanium oxide, chromium oxide, mullite, spinel ceramics are also included according to the main composition of oxide ceramic material.
The melting points of most oxides are high that is more than 2000 ℃, so they’re stable in oxidizing atmospheres, and that’s where the stability of the oxide ceramics comes in. In addition, the electrical insulation and insulation of oxide ceramics are also obtained from oxide in the high-temperature environment.
The significant feature of oxide ceramics in thermal spraying is that it can be sprayed directly in the atmospheric environment without the need of vacuum or protective atmosphere, which is good for equipment manufacturing, spraying shop design and cost reduction. Therefore, the oxide ceramics has become a widely used ceramic coating material with a wide application in thermal spraying.
At present, the application field of thermal spraying ceramic coating based on oxide has been widely applied, including chemical and metallurgical fields such as petrochemical, metallurgy, etc. As well as the mechanical and conveyance field that uses its wear-resisting property; and the aerospace engines field by using its heat – resistant and thermal barrier properties.
In addition, oxide ceramics also work well in the fields of electrical insulation, magnetic shielding, the solid electrolyte, infrared radiation and so on.
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