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Modelling powder concentration distribution from a coaxial deposition nozzle for laser-based rapid tooling

Research output: Contribution to journalJournal article

Published

Journal publication date02/2004
JournalJournal of manufacturing science and engineering-Transactions of the asme
Journal number1
Volume126
Number of pages9
Pages33-41
Original languageEnglish

Abstract

Direct laser deposition is a solid freeform fabrication process that is capable of producing fully dense components with full structural integrity and is greatly enhanced by. the use of an onmidirectional coaxial powder nozzle to supply the build material. In order to optimize the technique, accurate control of the two critical operational parameters of material feed rate and incident laser power intensity is necessary. Both parameters are affected by the axial powder stream concentration between the nozzle and the deposition point. In this work, a mathematical model for the powder concentration distribution is developed and the results from it compared with an experimental investigation using optical and image analysis techniques. The two show good agreement. The application of the model to the evaluation of nozzle geometry and the calculation of laser beam attenuation are demonstrated.