R&amp;D Strategy for 3D Printing Metal Powders

이재성,

doi:10.4150/kpmi.2015.22.2.138

Cited by 4 publications

(2 citation statements)

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“…10 In the context of a TLPS variable melting point braze, the amount of liquid initially formed during TLP processing is particularly important as it should be sufficient to densify the braze as well as bond the faying surfaces of the substrates to be joined, yet isothermally solidify within a reasonable, known time frame. Base metal particle size a B , 7,[13][14][15] relative diffusivities D, 14,16 base metal grain size d, 14 heating rate R H , 7,13,15,17,18 processing temperature T P , 13,15,[17][18][19] base/additive solubilities, 12,16 powder purity and morphology 13 and bulk alloy composition 7,15,17,19,20 have all been found to influence the amount of liquid formed and it's duration during TLPS. [5][6][7]13,15 The amount of liquid formed critically affects densification.…”

Section: Introductionmentioning

confidence: 99%

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Influence of oxygen impurity content on transient liquid phase sintering behaviour of Cu–Ni powders

2014

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The oxygen content of a Cu powder has a significant influence on the transient liquid phase sintering (TLPS) behaviour of a Cu-Ni powder mixture. For Cu with low oxygen content, interdiffusion occurs between the Cu and Ni powders during heating and melting of the Cu phase. This interdiffusion leads to isothermal solidification of the Cu rich liquid and full TLPS behaviour. For Cu with a high oxygen content, a displacement reaction at the Cu/Ni interface occurs. Under certain conditions, this reaction leads to the formation of a continuous NiO layer over the Ni powder surface. This prevents Cu/Ni interdiffusion and wetting of the Ni particles by the molten Cu, thus eliminating the possibility for a TLPS process. Analysis of the results, indicate that the extent of NiO layer formation depends on oxygen content of the Cu, the composition of the powder mixture and the Ni particle size.

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Section: Introductionmentioning

confidence: 99%

“…[5][6][7]13,15 The amount of liquid formed critically affects densification. 5,15,18,20 The influence of powder purity on TLPS behaviour has received little attention. Oxygen is a common impurity in gas and water atomised powders.…”

Section: Introductionmentioning

confidence: 99%