The article presents an original technique that does not require the use of specialized laboratory equipment for measuring the melt flow rate of a composite filament obtained as a result of bulk modification of the polyethylene terephthalate glycol matrix with shungite and molybdenum disulfide.In the empirical study of the rheol. properties of the formed polymer composites, it was found that the rate of filament extrusion through the nozzle (∼ϕ500μm) FFF (Fused Filament Fabrication) of a 3D printer (Anycubic Mega S) differs significantly from the values of the melt flow index (MFI) measured using an industrial plastometer (IIRT-5).The obtained results must be taken into account when slicing stereolithog. (STL) models for the directed control of 3D models extrusion parameters in software's (Cura, Simplify3D or others) to improve the quality of 3D printed products.

01 Mar 2024·Ceramics International

Relationship of dynamic and static modules of elasticity of ceramics based on diatomite

Author: Nikolaev, Vladimir K. ; Skvortsov, Arkady A. ; Skvortsov, Pavel A. ; Gridasova, Ekaterina A. ; Dmitrevsky, Andrei A. ; Lukyanov, Mikhail N.

The work is focused on studying the relationship between dynamic E_d and static E_s modules of elasticity of porous diatomite.A significant difference (∼10 times) between E_d and E_s which was discovered exptl., was associated by the authors with the influence of the porosity value.The work examines various models of the dependence E_s = f (E_d), and it was established that for porous diatomite (with porosity P = 30-85%) nonlinear degree functions describe well the observed exptl. dependence E_s = f (E_d).

01 Feb 2024·JOM

New Generation Wrought Al-Ca-Mg Natural Composite Alloys as an Alternative to the 5000 Series Alloys

Author: Belov, N. A. ; Akopyan, T. K. ; Nguen, X. D. ; Letyagin, N. V. ; Fortuna, A. S.

The structure and mech. properties of the new group of wrought Al-3%Ca-(2-4)%Mg based alloys with a natural composite structure consisting of the aluminum matrix stabilized by homogenously distributed fine eutectic crystals of the Al4Ca phase have been studied using theor. and exptl. analyses.The high-quality sheet metal obtained upon hot rolling at 400-450°C confirms the high processability of new materials.Deformation processing leads to the formation of fine sub-grain structure with a characteristic sub-grain size of 1 μm.Very fine crystals of the Al4Ca phase particles are found at sub-grain boundaries, confirming their high pinning ability.Tensile tests of the as-wrought alloys revealed that addition of Ca in the Al-Mg alloys leads to a substantial increase in the strength properties (the ultimate tensile strength is in the 300-340 MPa range and the yield strengh is in 230-250 MPa range).Detailed anal. of various mechanisms influencing the strengthening of the new alloys revealed that contribution of sub-grain boundaries is the greatest and greatly exceeds all others: its contribution to the total YS is > 60%.Thus, addition of eutectic forming calcium in wrought Al-Mg alloys allows one to increase the strength properties through the stabilization of the sub-grain structure.

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