Magnesium alloy with adjustable degradation rate
US9593397B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2014 |
| Grant date | Mar 14, 2017 |
| Priority date | — |
| Expiry date | Jul 6, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L2400/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An alloy and an implant having a three-dimensional structure based on such alloy. The alloy comprises a MgZnCa alloy containing nanosized precipitates being less noble than the Mg matrix alloy and having a Zn content ranging 0.1 wt. % Zn to 2 wt. % Zn and a calcium content ranging from 0.2 wt. % to 0.5 wt. %, and having less than 0.04 wt. % of one or more other elements with the remainder being Mg. For these micro-alloys, any second phase generated during the solidification process can be completely dissolved by a solution heat treatment. Finely dispersed nanosized precipitates can then be generated by a subsequent aging heat treatment step. These precipitates are used to “pin” the grain boundaries and to prevent the coarsening of the grain structure during further processing to achieve grain sizes below 5 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.