Laser stereolithography of ZrO2 toughened Al2O3 |
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| Affiliation: | 1. Dipartimento di Ingegneria dell’innovazione, Università degli Studi di Lecce, Campus Universitario, Via per Arnesano 73100 Lecce, Italy;2. Dipartimento di Ingegneria Civile ed Ambientale, Politecnico di bari, Bari, Italy;1. Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning Province 116024, People’s Republic of China;2. Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269, USA;1. Swiss Federal Laboratories for Materials Science and Engineering, Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland;2. IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017 Barcelona, Spain;1. Centre for Advanced Jet Engineering Technologies (CaJET), School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Shandong University, Ministry of Education, PR China;3. Shandong Special Equipment Inspection Institute, Jinan 250013, PR China |
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| Abstract: | Ceramic laser stereolithography is a manufacturing process suitable candidate for the production of complex shape technical ceramics. The green ceramic is produced layer by layer through laser polymerisation of UV curable ceramic suspensions. A number of critical issues deserve attention: high solid loading and low viscosity of the suspensions, high UV reactivity, prevention of interlayer delamination in the green and in the sintered body, good mechanical performance. In this work, ZrO2 reinforced Al2O3 components have been obtained from an acrylic modified zircon loaded with alumina powders. The zircon compound is effective as organic photoactivated resin and allows the dispersion of a high volume fraction of Al2O3 powder (up to 50 vol.%) while keeping viscosity at reasonable low values. The zircon compound also represents a liquid ceramic precursor that converts to oxide after burning out of the binder. Thanks to the good dispersion of the alumina powder in the zircon acrylate, a uniform dispersion of ZrO2 submicron particles is obtained after pyrolysis. These are located at the grain boundaries between alumina grains. Formation of both monoclinic and tetragonal ZrO2 occurs as evidenced by XRD. No delamination occurs in bending tests as evidenced by SEM fractography, satisfactory modulus and strength values were concurrently found. |
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