Ceramic coating with improved scratch resistance and heat conduction properties

Ceramic coating intended to be applied on a metal support comprises a matrix including a metal polyalkoxide in the form of dispersed particles having a diameter of 0.01-50 mu m. The ceramic coating is present in the form of a continuous film having a thickness of 2-100 mu m. The particles are made from a material having a thermal conductivity of >= 10 W.m -> 1>.K -> 1> and a bulk density of 3.9 g/cm 3>. Independent claims are included for: (1) an article comprising a layer of the coating; and (2) manufacturing the ceramic coating on a surface of a metal article, comprising (i) treating a surface of the metal article to improve the adhesion of a sol-gel layer, (ii) preparing a sol-gel composition with a sol-gel precursor consisting of metal alkoxides, particles, optionally reactive silicone oil, structuring filler and/or pigment, (iii) hydrolyzing the sol-gel precursor by introducing water and a catalyst, acid or base, followed by performing a partial condensation reaction for obtaining a sol-gel composition, (iv) applying, on the surface, a layer of sol-gel composition, (v) drying of the layer at a temperature of 40-90[deg] C, and (vi) curing the coated article at a temperature of 150-400[deg] C.