Abstract: Multi-layer composite product, featuring low emissivity in the mid-infrared band (as wavelength range 2,5–5 ?m) and far-infrared (as wavelength range 8.0–14.0 ?m) bands, as well as low reflexivity in the near-infrared (at a wavelength range of 0.7–2.5 ?m) and in the visible (as wavelength range 0.3–0.7 ?m) bands, including a base constructed with low-density and/or high thermal-resilience structural materials, covered with optionally doped coating, and where, between the base and the coating, at least one intermediate layer of metals or metal oxides is planned for insertion.

Abstract: Multi-layer composite product, featuring low emissivity in the mid-infrared band (as wavelength range 2,5-5 &mgr;m) and far-infrared (as wavelength range 8.0-14.0 &mgr;m) bands, as well as low reflexivity in the near-infrared (at a wavelength range of 0.7-2.5 &mgr;m) and in the visible (as wavelength range 0.3-0.7 &mgr;m) bands, including a base constructed with low-density and/or high thermal-resilience structural materials, covered with optionally doped coating, and where, between the base and the coating, at least one intermediate layer of metals or metal oxides is planned for insertion.

Abstract: Process for the preparation of articles in Titanium coated with a layer of Titanium oxide is described, wherein the metallic Titanium is subjected to the following steps: optional conditioning of the surface; anodic oxidation treatment, in an electrolytic cell of which it represents the anode, in a bath made of an aqueous solution comprising sulfuric acid, hydrochloric acid and hydrofluoric acid; and forming onto the metallic surface, by effect of electrolysis, an oxide layer having a >1 &mgr;m thickness and containing a single crystalline phase made of anatase (one of the two allotropic tetragonal shapes of Titanium oxide). Object of the invention are also the articles in Titanium coated with a thick layer of anatase so obtainable, and the use thereof as photocatalysts, under the action of an ultraviolet radiation.