JLA Vol:15 Iss:1 (Dual laser beam modification of high alumina ceramics)
Authors:
D. Triantafyllidis
Array
J. R. Bernstein
Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom
L. Li
Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom
F. H. Stott
Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United KingdomAlumina-based refractory materials are extensively used in high-temperature applications, such as linings in waste incinerators. A sign...
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JLA Vol:19 Iss:2 (Femtosecond laser microstructuring of hot-isostatically pressed zirconia ceramic)
Authors:
Niko Ba¨rsch
Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, Germany
Kristian Werelius
Department of Prosthodontics, Johann Wolfgang Goethe University Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt/Main, Germany
Stephan Barcikowski
Fernando Liebana
Uwe Stute
Andreas Ostendorf
Laser Zentrum Hannover, Hollerithallee 8, 30419 Hannover, GermanyDensely sintered zirconia ceramics—especially hot-isostatically pressed forms of zirconia ceramics like hot-isostatically pressed yttria-stabilized tetragonal zirconia polycrystal (HIP Y-TZP)—have the potential of superseding conve...
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JLA Vol:26 Iss:1 (Investigation on reducing distortion by preheating during manufacture of aluminum components using selective laser melting)
Authors:
Damien Buchbinder
Wilhelm Meiners
Norbert Pirch
Konrad Wissenbach
Fraunhofer Institute for Laser Technology (ILT), Aachen 52074, Germany
Johannes Schrage
Chair for Laser Technology, RWTH Aachen University, Germany 52024, AachenThe additive manufacturing process selective laser melting (SLM) can be used to directly produce functional components made out of metal. During the construction process, however, thermally induced residual stress occurs due to the layered build-up and the local input of energy by means of a focused laser beam, which can lead to distortion of the component or sections of the component itself....
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JLA Vol:8 Iss:5 (Diode‐pumped Nd:YAG laser for precision laser machining)
Authors:
Jason Machan
Marcy Valley
Gerry Holleman
Marc Mitchell
Dave Burchman
Jim Zamel
George Harpole
Hagop Injeyan
Len Marabella
TRW R1/1184, One Space Park, Redondo Beach, CA 90278, U.S.A.Results are presented on a high power, diode‐pumped, pulsed Nd:YAG laser for precision laser machining. The laser is an unstable resonator with a graded reflectivity outcoupler, generating a beam with excellent beam quality. The gain medium is a single zig‐zag slab, pumped symmetrically by diode arrays. The use of diode arrays minimizes the thermal loading on the slab, and the zig...
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JLA Vol:2 Iss:1 (The Energy Transfer Efficiency in Laser Welding Process)
Authors:
T. H. Kim
Charles E. Albright
Schichan Chiang
Department of Welding Engineering, The Ohio State University, 190 W. 19th Ave., Columbus, Ohio 43210The process efficiency of laser beam welding was measured as a function of travel speed. Temperature measurements were carried out during the bead‐on‐plate laser welding of mild steel with a focused 2KW CO2 laser beam at various welding travel speeds. The laser welding process efficiency (power delivered to work/power in the beam) was calculated from the ratio of the heat content of the welded the specimen to the available laser beam energy (power × time). In the deep penetr...
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