A kind of short process preparation method of magnesium or magnesium alloy capillary

Abstract

The invention discloses a short-process preparation method of a magnesium or magnesium alloy capillary. The method comprises the steps that: a small-diameter thin-walled magnesium or magnesium alloy tube with smooth inner and outer surfaces, continuous columnar grain structure, and excellent cold-processing performance is prepared with a continuous directional solidification technology; under a condition with no surface treatment, the magnesium or magnesium alloy tube is directly subjected to a subsequent drawing process, wherein no intermediate annealing or a small volume of intermediate annealing is needed during the drawing process, such that the magnesium or magnesium alloy capillary is prepared with a short process and with high efficiency. According to the invention, the small-diameter thin-walled magnesium or magnesium alloy tube prepared with the continuous directional solidification technology is directly subjected to the drawing process, such that the magnesium or magnesium alloy capillary is prepared; and no intermediate annealing or a small volume of intermediate annealing is needed during the drawing process. Therefore, the method provided by the invention has the advantages of short process flow, high production efficiency, and low cost. During the capillary drawing process, no process such as cutting, machining, and pickling is needed, such that capillary processing efficiency can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a short-flow preparation method of a magnesium or magnesium alloy capillary. Background technique [0002] Intravascular stents are one of the most effective methods for treating cardiovascular diseases and are widely used in human medicine and other fields. The metal capillary is the main component of the metal vascular stent and the key to determine the quality of the metal vascular stent. At present, the metal intravascular stent materials used mainly include metal capillaries such as stainless steel, cobalt alloy, and titanium alloy, but these metal capillaries exist permanently in the body, have certain thrombogenicity, still have high restenosis, and can cause damage to the blood vessel wall. Weakness and other problems greatly limit its application, thus forcing people to look for new alternative metal capillary materials. Studies have found that compar...

AI Technical Summary

Problems solved by technology

The above capillary production methods have the advantages of relatively mature production technology and relatively stable product quality, but the process is complicated, the process is long, the energy consumption is large, the production efficiency is low, and the production cost is high; the composition uniformity of the ingot is poor, and the capillary prepared by the same ingot The performance uniformity is poor; the surface of the material is easy to oxidize during and after processing, and the surface quality is poor; the material waste is serious and the yield is low; the unevenness of the metal flow during multiple empty drawing is likely to cause cracks on the inner surface of the capillary. Wrinkles and uneven wall thickness, which affect the surface quality of magnesium or magnesium alloy capillaries

The above problems have greatly limited the rapid development and application of medical magnesium or magnesium alloy capillaries.