Sol-gel nanocomposite hard coatings

Sol-gel processing is a versatile technology for obtaining multifunctional (hydrophobic, scratch, abrasion and corrosion resistant, anti-bacterial, anti-reflective, etc.) coatings on different substrates, and a judicious selection of precursors is required to form a sol for obtaining coatings with the required properties. Organic–inorganic hybrid nanocomposite coatings blend the properties of organic polymeric materials with those of ceramics: the inorganic components improve properties like scratch resistance, durability, impact strength, and the gloss of the coating, while the organic moieties increase the flexibility, critical thickness and impart low temperature coating curability. For several industrial applications, hard coatings need to be deposited on various substrates (with varying temperature sensitivities) to improve their mechanical properties. These coatings are usually characterized by their scratch hardness, abrasion resistance, nanoindentation hardness and adhesion. This chapter presents a comprehensive review of the sol-gel derived nanocomposite hard coatings investigated on different substrates, along with typical examples of industrial applications, as appropriate.

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