Aluminum alloys have been widely used in engineering like architecture, automobile, military, navigation, aviation and aerospace, due to their good thermal conductivity, light weight and good mechanical strength and corrosion resistance. Regrettably, friction coefficient and wear rate of the aluminum alloy are very high under dry sliding. Consequently, indispensable methods are needed to improve the tribological properties of the aluminum alloys for many special applications.Composite coatings are widely applied to mechanical components due to their high mechanical, chemical and tribological properties, as well as perfect corrosion and oxidation resistance. The excellent properties are attributed to the microstructure of the composite coatings incorporated with micro-ceramic particles, which can be further tailored by designing the compositions.
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