Processing of biocompatible porous Ti and Mg

Effect of Pore Size, Morphology and Orientation on the Bulk Stiffness of a Porous Ti35Nb4Sn Alloy

“…For the sake of clarity, it should be noted that nominal volumetric porosity in fiber-void specimens had to be adjusted [i.e., reduced, starting at 10% instead of 30%] to achieve a similar porosity range to that exhibited by the particle-void specimens and therefore make the two sets comparable (Table 2). These values are in agreement with others reported in the literature for Ti-based alloys prepared via powder metallurgy/space-holder method regardless of the pore morphology (Ref 24,30,42,43). Therefore, the influence of macropore size on the bulk mechanical stiffness of specimens in the same range of porosity was shown to be negligible.…”

Porous magnesium-based scaffolds for tissue engineering

“…Changing the pore size, pore shape, porosity, and pore distribution can affect the mechanical properties [48,83,84]. Increasing porosity results in the decrease of compression strength, yield strength, and Young's modulus [48,83,84].…”

“…Increasing porosity results in the decrease of compression strength, yield strength, and Young's modulus [48,83,84]. The mechanical properties of porous magnesium prepared by the green compacts method using carbamide particles as the space holder and under 100 MP uniaxial pressure were studied to demonstrate the dependence of mechanical properties on pore size and porosity [48].…”

Current Status and Recent Developments in Porous Magnesium Fabrication

“…Furthermore, the thermal decomposition and gas release should proceed at the lowest possible temperature, because reactions at higher temperatures may result in unwanted products. Both types of the mentioned spacers could be used, as in research of Wen et al [48] where magnesium powder is mixed with particles of ammonium hydrogen carbonate and carbamide. Frequently, to avoid the segregation of powders and improve homogenization, a small amount of ethanol [49] or paraffin is added.…”

“…The first step takes 3-5 h with temperatures in the range 130-250 C. The temperature depends on the type of the space holder, because NH 4 HCO 3 needs a lower temperature for decomposition and CO(NH 2 ) 2 decomposes at a higher temperature. The second step takes from 2 to 6 h with temperatures in the range 500-630 C. [2,48,50] The specific time and temperature depend on the expected level of magnesium sintering.…”