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Hot/cold pressing is a very common process in powder metallurgy and polymer industry, in which powders are compacted at a temperature/pressure high enough to induce sintering and creeping processes, and make the materials much denser and stronger. In this study, we extent this strategy to the synthesis of carbon nanotube (CNT) nanocomposites, yet with the high compressive stress generated naturally...
Preparation of inks with proper rheology performance is the key for extrusion based 3D printing. In this work, extrusion based 3D printing graphene oxide (GO)/geopolymer (GOGP) nanocomposite was reported for the first time. The addition of GO in geopolymeric aqueous mixture (alumiosilicate and alkaline-source particles) dramatically changes its rheology properties, and enable the 3D printing that...
The method of slowness surface is used to study the ferroelastic phase transition of LiCsSO4. The slowness surfaces of the crystal have been plotted between 202K and 293K. The direction of the maximum slowness is on the XZ plane and the angle of it and X axis is −49.5 degree when temperature is above 206K. At 206K, the direction of the maximum slowness is along X axis. As the temperature decreases...
The three-dimensional slowness surface method is used to investigate the pure mode axes of single crystal BaTeMo2O9 on the basis of the experimental data. The relationship of the slowness surface and pure mode axes is studied. Under the condition of taking account of the piezoelectric effect, the piezoelectrically stiffened elastic constants are calculated. Pure mode axes of the BaTeMo2O9 crystal...
Three dimensional slowness surfaces are used to investigate ferroelastic phase transitions of hexagonal crystals. Two classes of three dimensional slowness surfaces have been found. The soft mode and the most prominent softening direction have been determined by the maximum slowness. For a hexagonal crystal, the components of the elastic stiffness coefficients c44 or c66 has direct relation with the...
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