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Journal of Ceramic Science and Technology 1/2013

Vol. 4, No. 1 · May 2013

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Laser-Assisted Microwave Plasma Processing of Ceramic Coatings

M. Willert-Porada, P. Pontiller, H.-S. Park, A. Rosin

Pages 1-10 · DOI: 10.4416/JCST2013-00003

The aim of Laser-Assisted Microwave Plasma Processing of materials, abbreviated as LAMPP, is to utilize a spatially well-confined laser beam to ignite and localize a microwave plasma plume as an energy source for the sintering, melting or recrystallization of ceramic coatings. The energy required for the high-temperature treatment is supplied to a significant extent from the microwave source that feeds the plasma while the laser beam is used to scan the microwave plasma over the surface area to be treated. The phenomena underlying ignition and sustainment of the plasma are described in respect …

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Submicrometer Silica Spheres Generated by Laser Fuming

C.M. Gomes, R. Müller, J. Günster, T. Mühler, R. Görke, J.G. Heinrich

Pages 11-18 · DOI: 10.4416/JCST2012-00033

The production of agglomerate-free SiO2 particles exhibiting a monomodal distribution of particle sizes of around 300 nm by means of direct laser fuming of micrometric SiO2 powders has been successfully demonstrated. With a 12 kW cw CO2 laser system, a production rate of up to 1 kilogram powder per hour was achieved. Almost ideal spherical amorphous SiO2 particles in a broad particle size distribution between 10 nm and several 100 nm (d50 ≈ 300 nm) were synthesized. Several observations suggest weak agglomeration forces between the particles. A temperature reduction of 200 °C for sintering pow …

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Hybrid Laser Ablation of Al₂O₃ Applying Simultaneous Argon Plasma Treatment at Atmospheric Pressure

C. Gerhard, S. Roux, F. Peters, S. Brückner, S. Wieneke, W. Viöl

Pages 19-24 · DOI: 10.4416/JCST2012-00034a

In this work, we present a hybrid laser-plasma ablation technique for material processing of ceramics. Atmospheric pressure argon plasma treatment as well as laser ablation and hybrid laser-plasma ablation experiments were performed on aluminium oxide in order to investigate the impact of the assisting plasma in terms of material removal efficiency and energy-related aspects. It was shown that by means of pure plasma treatment, surface roughness was decreased, resulting in an increase in surface energy and polarity, respectively. Further, by simultaneously applying a plasma beam at atmospheric …

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Experimental and Numerical Investigations of Laser Beam Polishing of Quartz Glass Surfaces

J. Hildebrand, B. Wittor, K. Hecht, J. Bliedtner, H. Müller

Pages 25-32 · DOI: 10.4416/JCST2012-00027

The aim of laser beam polishing is to achieve an even surface finish in the shortest possible time without changing the contour of the material. Laser radiation acts as a topology-independent sub-aperture tool. Analyses of influences on the process, interaction between laser radiation and the quartz glass as well as comprehensive evaluation of the results with regard to surface quality, and manipulation of tensions and mechanical properties support the development of an industrially applicable laser polishing technology. The polishing process was investigated with the commercial FE-software SY …

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Selective Laser Sintering as an Additive Manufacturing Method for Manufacturing Ceramic Components

M. Ahlhelm, H.-J. Richter, K. Haderk

Pages 33-40 · DOI: 10.4416/JCST2012-00024

Selective Laser Sintering (SLS) offers the advantage of directly manufacturing complex-shaped parts without the uneconomic loss of material so common when conventional manufacturing methods are applied. Originating from the laser sintering of polymers, lots of research has been conducted on advanced materials like metals and ceramics. In recent years the Fraunhofer IKTS has conducted research on the laser sintering of SiC and different hydroxyapatite (HAp) powders. The HAp powders have been characterized based on their laser sintering ability with the variation of process parameters like sprea …

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Preparation of Transparent Microspheres in the K_0.5Na_0.5NbO₃ System by Laser Fusing

F.J. Hmood, C. Oelgardt, R. Görke, J.G. Heinrich

Pages 41-48 · DOI: 10.4416/JCST2012-00040a

Transparent microspheres have been synthesized from K0.5Na0.5NbO3 using a CO2-5 kW laser beam. The influence of the laser power on the transparent fraction of the resulting microspheres has been investigated. Particle size (d50), chemical composition, microstructure, crystallization behavior and the optical transmission of the resulting microspheres have been characterized. The particle size of the resulting microspheres is 62.5 μm ± 1.4 μm. The highest transparent fraction is 68.5 % ± 1.6 %, achieved with the optimum laser power of 2 kW. The glass transition temperature (Tg) and the first tem …

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