A model for the interaction of near-infrared laser pulses with metal powders in selective laser sintering

Fischer, Pascal; Karapatis, N. P.; Romano, Valerio; Glardon, Rémy; Weber, Hans‐Peter

doi:10.1007/s003390101139

Cited by 101 publications

(56 citation statements)

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“…To achieve a comparable degree of consolidation with commercially pure titanium powder of comparable granulometry, using the same experimental setup, an average power of 3 W at 5 kHz repetition rate is required [5][6][7]. This is a 15 times higher critical average power than for amorphous PtCuNiP powder (or, in other terms, a 4.5 times higher critical pulse energy of 600 µJ compared to 133.33 µJ): Assuming a similar powder density in the powder bed, the following considerations may provide the explanation.…”

Section: Discussionmentioning

confidence: 99%

“…The spot size on the surface of the powder bed was 100 µm, i.e., larger than the individual grains [5].…”

Section: Methodsmentioning

confidence: 99%

“…Using pulsed rather than cw radiation offers some advantages as recently demonstrated with a Nd:YAG laser: higher lateral precision because of the shorter wavelength, a substantial reduction of the average power to a few 10 Watts for the sintering of pure metallic powder and a control of local porosity [5][6][7]. Pulsed lasers, therefore, provide a versatile tool for the generation of locally functionalized parts by a selective sintering process.…”

Section: Introductionmentioning

confidence: 99%

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Selective laser sintering of amorphous metal powder

Fischer

Blatter²,

Romano

et al. 2005

Appl. Phys. A

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For the first time, selective sintering of amorphous PtCuNiP powder with a pulsed Nd:YAG laser has been studied. Upon pulsed interaction, the grains melt only superficially to build necks between the grains. Depending on the laser parameters, the sintered material can be crystallized or retained amorphous. By contrast with crystalline powder, laser sintering of amorphous powder is achieved at substantially lower pulse energies due to its low melting point. The obtained results are compared with previous results from selective laser sintering of titanium powder.PACS 61.43.Dq; 81.20.Ev, 81.05.Rm

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Section: Discussionmentioning

confidence: 99%

“…The spot size on the surface of the powder bed was 100 µm, i.e., larger than the individual grains [5].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selective laser sintering of amorphous metal powder

Fischer

Blatter²,

Romano

et al. 2005

Appl. Phys. A

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show abstract

“…The physical properties of the employed powder were described in [2,3]. Impurities in the powder-delivery system result in traces of nickel localised in the binding material, as found by energy-dispersive X-ray microanalysis (EDX).…”

Section: Materials Characterisationmentioning

confidence: 99%

“…Pulsed laser sintering has been shown to be the key towards further improvement of the precision due to its different interaction manner: as described in our model for the interaction of near-infrared laser pulses in selective laser sintering [2], the process can be optimised by adapting the pulse duration to the powder size in such a way that the heat diffuses much less than the grain radius during the interacting pulse. In this case, only the surfaces of the individual grains are melted.…”

Section: Introductionmentioning

confidence: 99%