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Laser surface cladding of aluminium with oxide ceramics

Laserbeschichten von Aluminium mit Oxidkeramik
: Nowotny, S.; Müller, A.; Techel, A.; Franz, U.

Fabbro, R.; Kar, A.; Matsunawa, A. ; Laser Institute of America -LIA-:
Laser Materials Processing Conference 1997. Proceedings. Vol. 1
Orlando, Fla.: LIA, 1997 (LIA 83A)
ISBN: 0-912035-56-0
S.37-44 : Ill., Lit.
International Congress on Applications of Lasers and Electro Optics (ICALEO) <1997, San Diego/Calif.>
Laser Materials Processing Conference <1997, San Diego/Calif.>
Fraunhofer IWS ()
Beschichten; ceramic coating; ceramics; cladding; Keramik; keramisches Beschichten; laser; Leichtmetall; light metal; Oberflächenbehandlung; surface treatment

Today, intricate problems of surface treatment can be solved through precision cladding using advanced laser technology. Metallic and carbidic coatings have been produced with high power lasers for years, and current investigations show that laser cladding is also a promising technique for the production of dense and precisely localized ceramic layers. In the present work, powders based on Al2O3/TiO2 were used to clad aluminium light alloys. The compact layers are up to 1 mm thick and show a non-porous cast structure as well as a homogeneous network of vertical cracks. The high adhesive strength is due to several chemical and mechanical bonding mechanisms and may exceed that of plasma-sprayed coatings. Compared to thermal spray techniques, the material deposition is strictly focused onto small functional areas of the workpiece. Thus, being a precision technique, laser cladding is not recommended for large-area coatings. Examples of applications are filigree parts of pump casings.