Investigation of the effects of nonconventional beam geometries in laser surface treatment of ceramics: Theoretical analysis
| Autor: | Lin Li, F.H. Stott, D Triantafyllidis |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Thermal shock
Materials science Metallurgy Biomedical Engineering Microstructure Laser Atomic and Molecular Physics and Optics Finite element method Electronic Optical and Magnetic Materials law.invention law visual_art Thermal visual_art.visual_art_medium Ceramic Composite material Instrumentation Beam (structure) Solid solution |
| Zdroj: | Journal of Laser Applications. 18:161-168 |
| ISSN: | 1938-1387 1042-346X |
| DOI: | 10.2351/1.2193176 |
| Popis: | Laser surface treatment of ceramics by melting and resolidification generally leads to the formation of fully densified and homogeneous surfaces, with enhanced mechanical and physical properties. A common problem associated with the process is the formation of thermally induced cracks on solidification and cooling. This, however, can be eliminated by controlling the cooling rates and thermal gradients during processing. Such control can be achieved by applying pre- and postheating methods or by scanning the laser beam at relatively slow speeds to modify the thermal shock conditions to which the surface is subjected. The latter technique has been successfully applied to the development of crack-free surfaces in Al2O3-based refractory ceramics. The relatively slow speed, however, limits the practicability of the technique. This article presents a novel theoretical analysis of the effects of various nonconventional beam geometries on cooling rates and, hence, on interaction times and processing speeds, durin... |
| Databáze: | OpenAIRE |
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