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Article: Reflectance and transmittance of TrueForm TM powder and its composites to CO 2 laser

TitleReflectance and transmittance of TrueForm TM powder and its composites to CO 2 laser
Authors
KeywordsComposite Materials
Lasers
Powders
Issue Date2007
PublisherEmerald Group Publishing Limited. The Journal's web site is located at http://www.emeraldinsight.com/info/journals/rpj/rpj.jsp
Citation
Rapid Prototyping Journal, 2007, v. 13 n. 3, p. 175-181 How to Cite?
AbstractPurpose: The purpose of this paper is to report on a study of the effect of glass microsphere (GMS) and potassium bromide (KBr) powder as an additive on the reflectance and transmittance of TrueForm TM acrylic-styrene co-polymer (TF) powder to CO 2 laser during selective laser sintering (SLS). Design/methodology/approach: GMSs and KBr powder were chosen because glass is opaque to CO 2 laser while KBr is transparent. The GMSs were treated with silane coupling agent and hydrofluoric acid to study the surface effect on the optical properties of TF/GMS blends. KBr powder was blend with TF powder in an attempt to modify the penetration depth of the laser in the powder bed. An integrating sphere was used to measure the reflectance of the powder bed. In the measurement of transmittance, a power meter was placed below the powder layer, which was supported by a KCl disc, to register the transmitted laser energy through the powder layer. Findings: For the TF/GMS blends, smaller GMSs gave a higher reflectance while the surface treatments had little effect. The transmittance of both the polymer and the blends were very low. Although bulk KBr is highly transparent to CO 2 laser, adding 30 vol% of KBr powder to TF hardly increased the transmittance of the powder bed. Research limitations/implications: Experiments were carried out on a modified laser engraving machine rather than a commercial SLS machine. The laser energy density used was lower than that for normal SLS processes and no significant changes of physical condition of the powder bed were inflicted. The results only indicate the optical properties in the initial state. Practical implications: The effects of transparent and non-transparent fillers on the optical properties of the powder bed are presented. Originality/value: This work furthers the understanding of heat absorption behavior of the powder bed during SLS. © Emerald Group Publishing Limited.
Persistent Identifierhttp://hdl.handle.net/10722/156895
ISSN
2015 Impact Factor: 1.352
2015 SCImago Journal Rankings: 0.808
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorFan, KMen_US
dc.contributor.authorWong, KWen_US
dc.contributor.authorCheung, WLen_US
dc.contributor.authorGibson, Ien_US
dc.date.accessioned2012-08-08T08:44:27Z-
dc.date.available2012-08-08T08:44:27Z-
dc.date.issued2007en_US
dc.identifier.citationRapid Prototyping Journal, 2007, v. 13 n. 3, p. 175-181en_US
dc.identifier.issn1355-2546en_US
dc.identifier.urihttp://hdl.handle.net/10722/156895-
dc.description.abstractPurpose: The purpose of this paper is to report on a study of the effect of glass microsphere (GMS) and potassium bromide (KBr) powder as an additive on the reflectance and transmittance of TrueForm TM acrylic-styrene co-polymer (TF) powder to CO 2 laser during selective laser sintering (SLS). Design/methodology/approach: GMSs and KBr powder were chosen because glass is opaque to CO 2 laser while KBr is transparent. The GMSs were treated with silane coupling agent and hydrofluoric acid to study the surface effect on the optical properties of TF/GMS blends. KBr powder was blend with TF powder in an attempt to modify the penetration depth of the laser in the powder bed. An integrating sphere was used to measure the reflectance of the powder bed. In the measurement of transmittance, a power meter was placed below the powder layer, which was supported by a KCl disc, to register the transmitted laser energy through the powder layer. Findings: For the TF/GMS blends, smaller GMSs gave a higher reflectance while the surface treatments had little effect. The transmittance of both the polymer and the blends were very low. Although bulk KBr is highly transparent to CO 2 laser, adding 30 vol% of KBr powder to TF hardly increased the transmittance of the powder bed. Research limitations/implications: Experiments were carried out on a modified laser engraving machine rather than a commercial SLS machine. The laser energy density used was lower than that for normal SLS processes and no significant changes of physical condition of the powder bed were inflicted. The results only indicate the optical properties in the initial state. Practical implications: The effects of transparent and non-transparent fillers on the optical properties of the powder bed are presented. Originality/value: This work furthers the understanding of heat absorption behavior of the powder bed during SLS. © Emerald Group Publishing Limited.en_US
dc.languageengen_US
dc.publisherEmerald Group Publishing Limited. The Journal's web site is located at http://www.emeraldinsight.com/info/journals/rpj/rpj.jspen_US
dc.relation.ispartofRapid Prototyping Journalen_US
dc.subjectComposite Materialsen_US
dc.subjectLasersen_US
dc.subjectPowdersen_US
dc.titleReflectance and transmittance of TrueForm TM powder and its composites to CO 2 laseren_US
dc.typeArticleen_US
dc.identifier.emailCheung, WL:wlcheung@hkucc.hku.hken_US
dc.identifier.authorityCheung, WL=rp00103en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1108/13552540710750924en_US
dc.identifier.scopuseid_2-s2.0-34249744119en_US
dc.identifier.hkuros132869-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34249744119&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume13en_US
dc.identifier.issue3en_US
dc.identifier.spage175en_US
dc.identifier.epage181en_US
dc.identifier.isiWOS:000247802500007-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridFan, KM=8709080900en_US
dc.identifier.scopusauthoridWong, KW=37096577500en_US
dc.identifier.scopusauthoridCheung, WL=7202743084en_US
dc.identifier.scopusauthoridGibson, I=15831816500en_US

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