Preparation method of biomedical high-purity magnesium tube rod wire raw material

Abstract

The invention discloses a preparation method of a biomedical high-purity magnesium tube rod wire raw material, which comprises the following steps: firstly, manufacturing a semi-finished product of a tube rod wire by adopting a warm-state large-deformation extrusion technology, and then preparing a deep-processed product of the tube rod wire by adopting a cold-state small-deformation rotary swaging technology. And finally, performing post-treatment to prepare the finished product raw material of the tube-rod wire for the medical apparatus and instruments, which can meet different purposes. The preparation method has the characteristics of feasibility, practical processing technology, relatively low production cost and the like.

Description

technical field [0001] The invention belongs to the field of high-purity magnesium raw material preparation, and in particular relates to a preparation method of a biomedical high-purity magnesium tube rod wire raw material, which is used for the research, development and application of human surgical implants and orthopaedic repair instrument products. Background technique [0002] In the field of biomedical metal materials, magnesium metal has good biocompatibility and biodegradability (absorbability). Research and development of surgical implants such as bone screws and orthopaedic repair products. Because magnesium is an essential trace metal element for the human body, this new product can be degraded or absorbed in the human body after the service is completed, and the degradation product has little toxic and side effects on the human body, avoiding the need for secondary surgery to remove it, and can reduce the physical and mental pain of the patient. family financia...

AI Technical Summary

Problems solved by technology

[0006] 1) The traditional high-temperature (temperature 350-500°C) hot extrusion method or technology cannot significantly improve the mechanical strength of high-purity magnesium raw materials (the tensile strength is still lower than 150MPa), especially the yield strength is less than 100MPa, so it cannot meet a large number of clinical applications Requirements; 2) Metal raw materials such as rods, tubes, and wires obtained by traditional thermal processing techniques are easily oxidized due to the strong activity of high-purity magnesium, which will inevitably cause coarse grain structures inside and outside the raw materials and obvious The microstructure is not uniform and thermally induced cracks, so it will have a certain adverse effect on the stability and consistency of the mechanical properties and degradation properties of the material between different production batches; 3) Adopt traditional thermal processing, including online heating and continuous processing , or take out the billet directly after heating in the resistance furnace, and then perform thermal processing such as hot swaging, hot rolling, and hot drawing. Although these thermal processing methods can increase the deformation rate in a single pass, they still cannot significantly refine the grains. , Improve material structure uniformity and material strength; 4) Although the above-mentioned products can also be used for secondary deep processing by "cold processing" such as rolling and drawing, which are common in industry at room temperature (room temperature), the processing efficiency is low, and the rolling The processing deformation method of drawing or drawing makes the material bear "two-way compressive stress and one-way tensile stress" during deformation. Microcracks are prone to appear, which can affect the mechanical service performance and uniform degradation performance of new medical device products

Images