ITEM MADE FROM COMPOSITE MATERIAL WITH CERAMIC COATING (VERSIONS) AND COATING FORMING METHOD Russian patent published in 2009 - IPC C25D9/04 C25D3/02 C25D5/30 

FIELD: metallurgy industry.

SUBSTANCE: invention refers to items made from composite materials, and namely to items consisting of metal with ceramic coating, as well as to the method of applying ceramic coating to metals and their alloys. When forming the ceramic coating on an electrically conducting item, the first electrode containing electrically conducting item is submerged into an electrolyte which contains water solution of metal hydroxide and metal silicate. Vessel wherein there is electrolyte, or electrode submerged in electrolyte is used as the second electrode, and alternate current is passed from resonant power supply through the first electrode used as an anode and the second electrode used as a cathode, thus forming angle ϕ between current and voltage, which equals zero degrees. Voltage between the first and second electrodes is maintained within the specified range for crystal inclusions and high-temperature modifications of oxides to appear in the coating being obtained. There obtained is an item made according to the above method, which contains metal, silicon and oxygen, and wherein silicon concentration increases in the direction from the item surface to external surface of surface layer of ceramic coating.

EFFECT: obtaining the coating with excellent mechanical and safety performance such as very high hardness, increased ultimate tensile strength, wear-and-tear- and heat resistance, strong bonding to the base, low friction factor, high dielectric strength, and very high chemical and corrosion resistance.

31 cl, 2 tbl, 30 dwg, 1 ex