To provide a process and a device for forming a ceramic coating film for carrying out plasma electrolytic oxidation of metals and alloys, forming ceramic coatings on surfaces thereof at a rate of 2-10 m/min.
The process comprises the use of high-frequency current pulses of a certain form and having a given frequency range, combined with the generation of acoustic vibrations in a sonic frequency range in the electrolyte. The frequency ranges of the current pulses and the acoustic vibrations are overlapped. The process makes it possible to introduce ultra-disperse powders into the electrolyte, with the acoustic vibrations helping to form a stable hydrosol, and to create the coating film with set properties. The process makes it possible to produce the dense hard microcrystalline ceramic coating film of thickness up to 150 m. The coating film is characterized in that specific thickness of an external porous layer is reduced (less than 14% of the total coating thickness) and roughness of the oxidized surface is made low, Ra 0.6-2.1 m.
SAMSONOV VICTOR IOSIFOVICH
| JPS4223290B1 | ||||
| JP2000510530A | 2000-08-15 | |||
| JPS4223290B1 | ||||
| JP2000510530A | 2000-08-15 |
Arihara Koichi
Matsushima Tetsuo