Microstructuring of metal surfaces without burr by means of a combined oxidation-sublimation process in the focus of a laser beam

Friedrich G. Lupp; Christoph A. O. Hamann

doi:10.1117/12.281096

18 August 1997 Microstructuring of metal surfaces without burr by means of a combined oxidation-sublimation process in the focus of a laser beam

Friedrich G. Lupp, Christoph A. O. Hamann

Author Affiliations +

Proceedings Volume 3097, Lasers in Material Processing; (1997) https://doi.org/10.1117/12.281096
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

Hydrodynamical bearings for X-ray tubes made of molybdenum offer several advantages over ball bearings, one being the reduced noise, another the extended life time. A process has been developed to texture a molybdenum surface with a laser beam without generating blur. In order to avoid melt which may cause burr the material is evaporate via its oxides. A two step oxidation followed by the sublimation has been identified as governing process. The flat bottom of the groove is explained by the limited diffusion velocity of the oxygen and the reaction products. Incorporating a process control an accuracy of +/- 3 micrometers at groove depth of 20 micrometers was realized.

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Friedrich G. Lupp and Christoph A. O. Hamann "Microstructuring of metal surfaces without burr by means of a combined oxidation-sublimation process in the focus of a laser beam", Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); https://doi.org/10.1117/12.281096

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