Improving the Quality of Magnesium-Soluble Biological Alloy for Implants

Abstract

Currently, biosoluble materials are widely used for the manufacture of implants, among which the most promising are magnesium alloys. To investigate and test various carbonaceous materials for refining and modifying magnesium melt. The technology of modification of cast magnesium alloys of Mg-Zr-Nd system by dispersed graphite powder is proposed. It is shown that the optimal carbon additive in the amount of 0.05…0.1% improves the mechanical properties due to grain grinding and additional strengthening of structural components. A complex filter containing equal amounts of magnesite, graphite and calcite is proposed, which provides an increased level of refining of the melt to obtain high quality casting. It is shown that the use of a complex carbon-containing filter provides not only efficient refining of the melt, but also its additional modification. In the structure of the alloy there is an increased amount of intermetallic γ-phase, which increases the microhardness of the structural components of the alloy and improves its physical and mechanical characteristics. The structure and properties of the cast magnesium alloy of the Mg-Zr-Nd system during modification with dispersed graphite powder and its filtration through carbon-containing materials have been studied. The developed complex technology for processing the liquid melt of magnesium alloys of the Mg-Zr-Nd system allows to increase the yield of suitable casting and improve its quality.