Influence of mechanical activation of copper powder on physicomechanical changes in selective laser sintering products

Сапрыкин, А.А.; Ibragimov, Egor A.; Babakova, E.V.; Yakovlev, V. I.

doi:10.1063/1.4932889

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…Some cavities could be identified in the junction of grain boundary, whose formation is attributed to the presence of oxygen during SLM. Saprykin et al (2015) showed that oxidation of copper could pose a potential problem even in a shielding argon atmosphere. Yap et al (2015) and Zhang et al (2010) indicated that high reactivity to atmospheric oxygen of copper was a challenge in SLM, even at low concentrations.…”

Section: Microstructure and Surface Morphology Analysis 331 Microstructure Observationmentioning

confidence: 99%

“…Due to high reflectivity and high thermal conductivity of copper and copper alloys, a bulk of the incident laser energy is lost to the surroundings, leading to melt track discontinuities or partial melting, which make it challenging to process copper by SLM (Sciammarella et al, 2013; Zhang et al, 2013). (Sciammarella et al, 2013) deposited copper powder onto steel substrates via laser additive manufacturing, taking advantage of higher heat capacity of steel as compared to copper, resulting higher energy absorption during the deposition of the first layer. (Zhang et al, 2013) adopted a method involving a preheating platform at 100°C to compensate for the high thermal loss and achieved a copper alloy thin wall thickness of 0.4 mm through SLM process.…”

Section: Introductionmentioning

confidence: 99%

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Insights into fabrication mechanism of pure copper thin wall components by selective infrared laser melting

Guan

Zhang

Jiang

et al. 2019

RPJ

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Purpose This study aims to obtain the mechanistic insights for the fabrication of pure copper thin wall components by selective infrared (IR) laser melting (SLM) and correlated with microstructure development, microhardness, surface morphology and phase analysis. Experimental processes for single track and selection of substrate materials have been studied using a combination of different laser powers and scanning speeds. Design/methodology/approach SLM of pure copper was performed on a YONGNIAN Laser YLMS-120 SLM machine using an Nd: YAG fiber laser operating at 1,060 nm in the NIR region. Single-track experiments and processing parameters are investigated through different combinations of laser power and scanning speed. The microstructure of the fabricated pure copper samples by SLM technique was analyzed by means of X-ray diffraction, scanning electron microscope equipped with energy disperse spectrometer, optical microscope (OM) and micro-hardness tester. Findings Steel-based substrates were found suitable for pure copper manufacturing due to sufficient heat accumulation. The width of a single track was determined by liner energy density, showing discontinuities and irregular morphologies at low laser powers and high scanning speeds. As a result of instability of the molten pool induced by Marangoni convection, cracks and cavities were observed to appear along grain boundaries in the microstructure. The top surface morphology of SLM-processed component showed a streamflow structure and irregular shapes. However, the powder particles attached to side surface, which manifest copper powders, are even more sensitive to melt pool of contour track. The crystal phase characteristics of copper components indicated increasing crystallite size of a-Cu, and the decreasing intensity of diffraction peak was attributed to the presence of defects during SLM. The maximum relative density and microhardness were 82 per cent and 61.48 HV0.2, respectively. The minimum thickness of a pure copper thin wall component was 0.2 mm. Originality/value This paper demonstrated the forming mechanism and explored feasibility of pure copper thin wall parts by SLM technology in the NIR region. The surface morphology, microstructure and crystal structure were preliminary studied with laser processing parameters.

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Section: Microstructure and Surface Morphology Analysis 331 Microstructure Observationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into fabrication mechanism of pure copper thin wall components by selective infrared laser melting

Guan

Zhang

Jiang

et al. 2019

RPJ

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“…There is direct relationship between the pharmaceutical substance dissolution rate in biological fluids and its bioavailability [3–6]. The increase in solubility and dissolution rate of substances that are poorly soluble in water promotes both their release from the dosage form and their penetration through the biological membranes [7, 8].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Transformation of Compounds Leading to Physical, Chemical, and Biological Changes in Pharmaceutical Substances

Сыроешкин

Uspenskaya

Pleteneva

et al. 2018

The Scientific World Journal

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This study demonstrates the link between the modification of the solid-phase pharmaceutical substances mechanical structure and their activity in waters with different molar ratio «deuterium-protium». Mechanochemical transformation of the powders of lactose monohydrate and sodium chloride as models of nutrients and components of dosage forms was investigated by the complex of physicochemical and biological methods. The solubility and kinetic activity of substances dispersed in various ways showed a positive correlation with the solvent isotope profile. Substances dissolved in heavy water were more active than solutes in natural water. Differential IR spectroscopy confirmed the modification of substituents in the sample of lactose monohydrate, demonstrating physicochemical changes during mechanical intervention. The biological activity of the compounds was determined by the method of Spirotox. The activation energy was determined by Arrhenius. Compared with the native compound, dispersed lactose monohydrate showed lower activation energy and, therefore, greater efficiency. In conclusion, proposed data confirm the statement that mechanical changes in compounds can lead to physicochemical changes that affect chemical and biological profiles.

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“…A magnetic field is one of factors relevant to crystallization alongside with concentration of input reagents temperature acidity of the reaction environment, and availability of complexing agents etc. In literature [1][2][3][4] there are results presented, which indicate an enormously growing number of nuclei when crystallizing inorganic salts of water solutions. Its number increases almost proportionally to the field intensity.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Magnetic Field on Crystallization and some Properties of Silver Azide Crystals

Rodzevich

Kuzmina

Gazenaur

et al. 2018

MSF

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Influence of mechanical activation of copper powder on physicomechanical changes in selective laser sintering products

Cited by 11 publications

References 2 publications

Insights into fabrication mechanism of pure copper thin wall components by selective infrared laser melting

Insights into fabrication mechanism of pure copper thin wall components by selective infrared laser melting

Mechanical Transformation of Compounds Leading to Physical, Chemical, and Biological Changes in Pharmaceutical Substances

The Effect of Magnetic Field on Crystallization and some Properties of Silver Azide Crystals

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