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Title: Effect of infra-red power level on the sintering behaviour in the high speed sintering process
Authors: Majewski, Candice E.
Oduye, D.
Thomas, H.R.
Hopkinson, Neil
Keywords: Rapid prototyping
Rapid manufacturing
High speed sintering
Layer thickness
Part shrinkage
Issue Date: 2008
Publisher: © Emerald Group Publishing Limited
Citation: MAJEWSKI, C.E. ... et al, 2008. Effect of infra-red power level on the sintering behaviour in the high speed sintering process. Rapid prototyping journal, 14(3), pp. 155–160 [DOI 10.1108/13552540810878012]
Abstract: Purpose: To investigate the effects of the infra-red power level on sintering behaviour in the High Speed Sintering process. Design/methodology/approach: Single-layer parts were produced using the High Speed Sintering process, in order to determine the effect of the infra-red power level on the maximum achievable layer thickness, and the degree of sintering. The parts were examined using both optical microscopy and contact methods. Findings: Whilst it was expected that an increase in the infra-red lamp powder might allow an increase in the depth of sintering that could be achieved, as a result of increased thermal transfer through the powder, results in fact indicated that there is a maximum layer thickness that can be achieved, as a result of part shrinkage in the z direction. Optical microscopy images have shown that a greater degree of sintering occurs at higher power levels, which would be expected to correspond to an improvement in the mechanical properties of the parts produced. These images also indicate that the RAM forms in small ‘islands’ on the powder bed surface. However, these islands begin to merge as sintering progresses, to a greater degree as the infra-red lamp power is increased. Research limitations/implications: These results are based only on single layer parts. Further work will examine the sintering characteristics of multiple layer parts. Practical implications: Results have shown that, whilst it is not possible to increase the achievable layer thickness of the parts produced by modifying the infra-red lamp power, the degree of sintering can be improved greatly by increasing the power. Originality/value: High Speed Sintering is an entirely new process which is currently still under development; the results presented here will directly impact the direction of further development and research into this process.
Description: This is a journal article. It was published in the journal, Rapid prototyping journal, [© Emerald]. The definitive version is available at: http://www.emeraldinsight.com/1355-2546.htm
URI: https://dspace.lboro.ac.uk/2134/3493
ISSN: 1355-2546
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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