Effect of mixing time on the bed density, and microstructure of selective laser sintered (sls) aluminium powders

Olakanmi, Eyitayo Olatunde

doi:10.1590/s1516-14392012005000031

Cited by 21 publications

(14 citation statements)

References 17 publications

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“…Excessive oxide content can cause degradation in mechanical properties such as embrittlement to structural alloys [89]. Besides particle shape irregularity, high amount of surface oxide content has also shown to degrade powder flowability [67]. It is therefore appropriate to study the effects of powder contamination on parts generated under different feedstock conditions by measuring the change in oxide levels between starting and recycled powder.…”

Section: Powder Surface Chemistrymentioning

confidence: 99%

An overview of powder granulometry on feedstock and part performance in the selective laser melting process

Tan

Wong

Dalgarno

2017

Additive Manufacturing

192

154

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Section: Powder Surface Chemistrymentioning

confidence: 99%

An overview of powder granulometry on feedstock and part performance in the selective laser melting process

Tan

Wong

Dalgarno

2017

Additive Manufacturing

192

154

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“…According to these The goal of this work was to correlate the packing density with the size and shape of the powder particles, in order to understand the powder bed quality. As shown in [37], a higher packing density correlated with a higher density of produced parts. Therefore, the packing density of the powder bed was an important process parameter for LBM process.…”

Section: Discussionmentioning

confidence: 71%

3D Shape Analysis of Powder for Laser Beam Melting by Synchrotron X-ray CT

Thiede

Mishurova

Evsevleev

et al. 2019

QuBS

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The quality of components made by laser beam melting (LBM) additive manufacturing is naturally influenced by the quality of the powder bed. A packing density <1 and porosity inside the powder particles lead to intrinsic voids in the powder bed. Since the packing density is determined by the particle size and shape distribution, the determination of these properties is of significant interest to assess the printing process. In this work, the size and shape distribution, the amount of the particle’s intrinsic porosity, as well as the packing density of micrometric powder used for LBM, have been investigated by means of synchrotron X-ray computed tomography (CT). Two different powder batches were investigated: Ti–6Al–4V produced by plasma atomization and stainless steel 316L produced by gas atomization. Plasma atomization particles were observed to be more spherical in terms of the mean anisotropy compared to particles produced by gas atomization. The two kinds of particles were comparable in size according to the equivalent diameter. The packing density was lower (i.e., the powder bed contained more voids in between particles) for the Ti–6Al–4V particles. The comparison of the tomographic results with laser diffraction, as another particle size measurement technique, proved to be in agreement.

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“…As mentioned, the density of the powder layer has a significant effect on the degree of densification after sintering. This is illustrated by work done on selective laser sintering of aluminium powder [5] that showed a linear correlation between these parameters ( Figure 9).…”

Section: Powder Size Distributionmentioning

confidence: 83%

The Need for Powder Characterisation in the Additive Manufacturing Industry and the Establishment of a National Facility

Benson

Snyders

2015

sajie

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The characteristics of powders used in additive manufacturing can have significant effects on process efficiencies and the quality of the final products. Powder sizes and morphologies need to be optimised for a particular process, and this requires the facilities to perform these measurements as well as provide a quality check on powder batches that are purchased. The establishment of a national powder characterisation facility has been identified by the Titanium Centre of Competence (a DST-funded initiative) as a critical form of support for the development of a South African titanium metal industry. This paper discusses what effect the different powder characteristics can have on the selective laser sintering processes, as well as the state of development of this national facility. OPSOMMINGDie eienskappe van die poeiers wat gebruik word vir toevoegingsvervaardiging kan 'n noemenswaardige invloed op die prosesdoeltreffendheid en die gehalte van die finale produkte hê. Poeiergroottes en morfologieë moet geoptimeer word vir 'n spesifieke proses en dit vereis dat fasiliteite hierdie metings moet doen. Die gehalte van die poeier lotte moet ook verseker word. Die daarstelling van 'n nasionale poeier karakteriseringsfasiliteit is deur die Titaan Bevoegdheidsentrum identifiseer as 'n kritiese ondersteuningsmiddel vir die ontwikkeling van 'n Suid-Afrikaanse titaanmetaalindustrie. Hierdie artikel bespreek die effek van verskillende poeiereienskappe op die selektiewe lasersinterprosesse asook die ontwikkeling status van hierdie nasionale fasiliteit. #This article is an extension of a paper presented at

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Effect of mixing time on the bed density, and microstructure of selective laser sintered (sls) aluminium powders

Cited by 21 publications

References 17 publications

An overview of powder granulometry on feedstock and part performance in the selective laser melting process

An overview of powder granulometry on feedstock and part performance in the selective laser melting process

3D Shape Analysis of Powder for Laser Beam Melting by Synchrotron X-ray CT

The Need for Powder Characterisation in the Additive Manufacturing Industry and the Establishment of a National Facility

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