Influence of Mechanical Activation of Powder on SLS Process

Abstract

The paper presents the results of the experiment, describing the effect of mechanical activation of powder Cu and Ni on the nature of their SLS-sintering method. The changes in structure and bulk density of powders after mechanical activation are revealed, which generally has a positive effect on the synthesis process of a product.Intorduction

Improvement of the Sintered Surface and Bulk of the Product Via Differentiating Laser Sintering (Melting) Modes

“…Having processed a large amount of experimental data and detected an apparent change in the sintered surface of the powder material, figures [17][18][19] it is proposed to use the concepts of rough and finishing modes of laser sintering powder materials. This allows differentiating the modes of synthesizing the surface and the bulk of the prototype.…”

“…Particles of the powder have a spherical form with the nominal dimension of 0.007 mm, bulk density is 1.25-1.9 g/cm 3 . Thermal conductivity factor of copper powder is 3.6×10-3W/(m·ºС), and melting temperature is 1030-1070 ºС [16,17].…”

Phase Composition and Microstructure of Ti-Nb Alloy Produced by Selective Laser Melting

“…The elastic modulus for most alloys is within the range of 100-120 GPa [4,6], which, in its turn, is significantly higher than in the case of bones (15-50 GPa). Based on the above-mentioned facts, an upcoming trend in medical materials science is the production of biocompatible titanium alloys with low elastic modulus, for example, alloys of Ti-Nb or Ti-Nb-Zr systems [6]. Traditional methods used in producing the titanium-niobium alloys are extraction metallurgical methods.…”

“…Ti-Nb alloy samples produced by SLM using VARISKAF 100mV were investigated [6][7][8]. As the melting temperature of titanium (1725ºС) and niobium (2468ºС) are significantly different, composite titanium and niobium powder (60 wt% Ti and 40 wt% Nb) with average particle size of 20 µm was used as the reference material.…”

“…It should be mentioned, that Nb-doped alloy including 40 wt% of Nb (Тi40Nb) exhibits the lowest elastic modulus for such a system (55-70 GPa) [1]. The elastic modulus for most alloys is within the range of 100-120 GPa [4,6], which, in its turn, is significantly higher than in the case of bones (15-50 GPa). Based on the above-mentioned facts, an upcoming trend in medical materials science is the production of biocompatible titanium alloys with low elastic modulus, for example, alloys of Ti-Nb or Ti-Nb-Zr systems [6].…”