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Proceedings Paper

Microstructuring of metal surfaces without burr by means of a combined oxidation-sublimation process in the focus of a laser beam
Author(s): Friedrich G. Lupp; Christoph A. O. Hamann
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Paper 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.

Paper Details

Date Published: 18 August 1997
PDF: 8 pages
Proc. SPIE 3097, Lasers in Material Processing, (18 August 1997); doi: 10.1117/12.281096
Show Author Affiliations
Friedrich G. Lupp, Siemens AG (Germany)
Christoph A. O. Hamann, Siemens AG (Germany)

Published in SPIE Proceedings Vol. 3097:
Lasers in Material Processing
Leo H. J. F. Beckmann, Editor(s)

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