EP 1488024 A2 20041222 - PROCESS AND DEVICE FOR FORMING CERAMIC COATINGS ON METALS AND ALLOYS
Title (en)
PROCESS AND DEVICE FOR FORMING CERAMIC COATINGS ON METALS AND ALLOYS
Title (de)
VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG N VON KERAMISCHEN BESCHICHTUNGEN AUF METALLEN UND LEGIERUNGEN
Title (fr)
PROCEDE ET DISPOSITIF PERMETTANT DE FORMER DES REVETEMENTS EN CERAMIQUE SUR DES METAUX ET DES ALLIAGES
Publication
Application
Priority
- GB 0204305 W 20020923
- GB 0207193 A 20020327
- US 12301002 A 20020415
Abstract (en)
[origin: WO03083181A2] There is disclosed a process and apparatus for carrying out plasma electrolytic oxidation of metals and alloys, forming ceramic coatings on surfaces thereof at a rate of 2-10 microns per minute. 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 being overlapping. 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 coatings with set properties. The process makes it possible to produce dense hard microcrystalline ceramic coatings of thickness up to 150 microns. The coatings are characterised by reduced specific thickness of an external porous layer (less than 14% of the total coating thickness) and low roughness of the oxidised surface, Ra 0.6-2.1 microns.
IPC 1-7
IPC 8 full level
C25D 5/18 (2006.01); C25D 11/04 (2006.01); C25D 5/20 (2006.01); C25D 11/00 (2006.01); C25D 11/02 (2006.01); C25D 11/06 (2006.01); C25D 11/26 (2006.01); C25D 11/30 (2006.01); C25D 11/34 (2006.01)
CPC (source: EP US)
C25D 5/18 (2013.01 - EP US); C25D 5/20 (2013.01 - EP US); C25D 5/611 (2020.08 - EP US); C25D 5/617 (2020.08 - EP US); C25D 5/627 (2020.08 - EP US); C25D 11/005 (2013.01 - EP); C25D 11/024 (2013.01 - EP); C25D 11/026 (2013.01 - EP)
Citation (search report)
See references of WO 03083181A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
WO 03083181 A2 20031009; WO 03083181 A3 20040910; AU 2002329410 A1 20031013; AU 2002329410 A8 20031013; CN 100503899 C 20090624; CN 1623013 A 20050601; EP 1488024 A2 20041222; EP 1488024 B1 20170503; HK 1059804 A1 20040716; JP 2005521794 A 20050721; JP 2008038256 A 20080221; JP 4182002 B2 20081119; JP 4722102 B2 20110713; NO 20034936 D0 20031106; NO 20034936 L 20040109
DOCDB simple family (application)
GB 0204305 W 20020923; AU 2002329410 A 20020923; CN 02828521 A 20020923; EP 02765036 A 20020923; HK 04102314 A 20040330; JP 2003580609 A 20020923; JP 2007243844 A 20070920; NO 20034936 A 20031106