Powder flakes prepared from 50 ~m thick melt spun ribbons of Markomet 1064 (Ni Mo Cr B1 wt%) were shock consolidated in the unannealed and anne~f~~ co~§iti§n. "lhe unannealed flakes (microhardness g33 kg/mm2) are amorphous while flakes annealed at 900°C for 2 hours have an fcc structure with a grain size of 0.3 ~m and microhardness of 800 kg/mm2. The shock consolidated amorphous powder compact ...

The morphology of crystals has an appreciable impact role on the physicochemical properties of drugs. Drug properties such as flowability, dissolution, hardness and bioavailability may be affected by crystallinity behaviours of drugs. The objective of this study was to achieve an improved physicomechanical property of carbamazepine powder through recrystallization from aqueous solutions at diff...

Strategies to improve the mechanical compatibility of Ti-based materials for hard tissue implant applications are directed towards significant stiffness reduction by means of the adjustment of suitable β-phases and porous device architectures. In the present study, the effect of different compaction routes of the gas-atomized β-Ti-45Nb powder on the sample architecture, porosity, and on resulti...

In powder metallurgy (PM), the compaction step is fundamental to determining final properties of sintered components. The deformation and defectiveness introduced in material during uniaxial die can be correlated activation enhancement dislocation pipe diffusion, a lattice diffusion mechanism sintering process. Its coefficient depends on density. particles are mostly deformed along direction (l...

Unsaturated titanium hydride (TiHX) powder has high formability and is a promising raw material for titanium-based metallurgy. In this work, TiH2, TiHX, HDH Ti powders were characterized, the cold compaction behavior of was investigated, densification mechanism analyzed. The TiHX three-phase mixture containing an α plastic phase δ ε brittle phases through Rietveld refinement. compacts had compr...

The hot compaction of nanocrystalline TiO2 anatase powders is investigated using dilatometry. The constant rate of heating (CRH) method is applied to determine effective activation energies of the processes involved during sintering. Grain size and doping effects are studied, using dopant cations of different radius and charge: Zn, Al, Si, Nb. The results are interpreted by a mechanism includin...

– The aging dynamics and the fluctuation-dissipation relation between the spontaneous diffusion induced by a random noise and the drift motion induced by a small stirring force are numerically investigated in a 3D schematic model of compacting powder: a gravity-driven lattice-gas with purely kinetic constraints. The compaction dynamics is characterized by a super-aging behaviour and, in analogy...

Compaction of Bi and Ta powders was performed by uniaxial pressing at room temperature. Post-pressing density was evaluated as a function of the compaction pressure, and indicated that as the Ta content increases there is a reduction in density for comparable pressing conditions. A modified Heckel equation is used to evaluate the compaction behavior. The analysis indicates that the yield pressu...

Pvlercury porosimetry was used to measure the bulk and real densities, pore volumes and pore size distributions of compacts of hydroxyapatite before and after sintering. The hydroxyapatites were prepared by two different methods and had widely different surface areas. The properties were determined as a function of compaction force and sintering temperature. Densities from porosimetry were in g...

Fine cohesive powders are often dry granulated to improve their flowability. Roller compaction is commonly used to produce dense ribbons which are then milled. The material properties of the powder and the conditions in the roller compactor affect the strength of the ribbons, however there is no method in the literature to predict the size distribution of the product of ribbon milling. Here we ...