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    Mechanisms of selective laser sintering and heat transfer in Ti powder

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    Authors
    Tolochko, Nikolay K.
    Arshinov, Maxim K.
    Gusarov, Andrey V.
    Titov, Victor I.
    Laoui, Tahar
    Froyen, Ludo
    Issue Date
    2003
    
    Metadata
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    Abstract
    Coupled metallographic examination and heat transfer numerical simulation are applied to reveal the laser sintering mechanisms of Ti powder of 63-315?µm particle diameter. A Nd:YAG laser beam with a diameter of 2.7-5.3?mm and a power of 10-100?W is focused on a bed of loose Ti powder for 10?s in vacuum. The numerical simulation indicates that a nearly hemispherical temperature front propagates from the laser spot. In the region of a-Ti just behind the front, heat transfer is governed by thermal radiation. The balling effect, formation of melt droplets, is not observed because the temperature increases gradually and the melt appears inside initially sintered powder which resists the surface tension of the melt. (Emerald Publishing Group Limited)
    Citation
    Rapid Prototyping Journal, 9(5): 314-326
    Publisher
    Emerald Publishing Group Ltd.
    Journal
    Rapid Prototyping Journal
    URI
    http://hdl.handle.net/2436/29558
    DOI
    10.1108/13552540310502211
    Additional Links
    https://www.emeraldinsight.com/doi/full/10.1108/13552540310502211
    Type
    Journal article
    Language
    en
    Description
    This paper discusses how the estimation of the temperature field in the powder bed in selective laser sintering is a key issue for understanding sintering/binding mechanisms and for process optimisation. Carried out within a European research project, funded by INTAS (No. 99-1559, 2000-02), a model of independent small thermal contacts to calculate the effective contact conductivity in Ti powder bed was developed. This paper won the Emerald Literati Awards' Outstanding Paper 2004 (http://www.emeraldinsight.com/literaticlub/winners).
    ISSN
    13552546
    ae974a485f413a2113503eed53cd6c53
    10.1108/13552540310502211
    Scopus Count
    Collections
    Faculty of Science and Engineering

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