DEGRADATION BEHAVIOR OF A BIODEGRADABLE Fe-Mn ALLOY PRODUCED BY POWDER SINTERING

Abstract

Biodegradable stenting and implantation materials have received considerable attention in biomaterials community, with magnesium having been received most wide attention. However, magnesium corrodes too fast by nature, in human body environment. A new type of biodegradable metal -Fe and its alloys -has been introduced in recent years. In this study, a Fe35wt%Mn alloy was produced using powder sintering. Powder mixture was mechanically milled, pressed and then sintered to consolidate powder compacts. Microstructure characterization and hardness measurement were carried out on the as-sintered samples. In vitro degradability evaluation of the samples was performed in 5% NaCl and Simulated Body Fluid (SBF) media. The experimental results show that a higher porosity results in a higher degradation rate. All samples, with porosity being from 6.5% to 12.2 %, revealed a degradation rate from 0.6 to 1.4 mm/year.

Effect of Hydroxyapatite Nano Rods on Sinterability and Bioactivity of Fe-14Mn-6Si Alloy Prepared By Powder Metallurgy

“…Thirdly, during the progress of degradation, chloride ion in SBF reacts with Fe 2+ to form iron chloride, which is further hydrolyzed by water and created hydroxide and free hydrochloric acid which contributes in the growing of the localized pits. Finally, a new biocompatible layer comprised of calcium/phosphorus is formed on the surface of the composites [47]. This means that at the starting of degradation, the surface of composite is coated by bone-cells since the porous composite supports bone-cell adhesion and proliferation.…”

“…initial corrosion reaction, formation of hydroxide layer, formation of pits and formation of calcium/phosphorus layer. Firstly, [47]. This means that at the starting of degradation, the surface of composite is coated by bone-cells since the porous composite supports bone-cell adhesion and proliferation.…”

Effect of hydroxyapatite nano rods on sinterability, hardness and bioactivity of Fe-14Mn-6Si alloy prepared by powder metallurgy

“…Thirdly, during the progress of degradation, chloride ion in SBF reacts with Fe 2+ to form iron chloride, which is further hydrolyzed by water and created hydroxide and free hydrochloric acid which contributes in the growing of the localized pits. Finally, a new biocompatible layer comprised of calcium/phosphorus is formed on the surface of the composites [46]. This means that at the starting of degradation, the surface of composite is coated by bone-cells since the porous composite supports bone-cell adhesion and proliferation.…”