Method for plastically manufacturing high-purity magnesium alloy absorbable stent
A vascular stent, plastic processing technology, applied in stents, manufacturing tools, other manufacturing equipment/tools, etc., can solve the problems of poor corrosion resistance, easy damage to cells, low yield strength, etc., to improve yield strength and plasticity, eliminate The effect of hardening of blood vessels and increasing yield strength
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specific Embodiment approach 1
[0034] Embodiment 1: The steps of the plastic processing and manufacturing method of the high-purity magnesium alloy absorbable vascular stent in this embodiment are:
[0035] Step 1: preparing a Mg-Al-Zn or Mg-Zn-Ca alloy ingot with a purity greater than 99.99%, wherein the mass percentage of Al in the composition of the Mg-Al-Zn alloy ingot with a purity greater than 99.99% is 2.6-3.0 %, the mass percentage of Zn is 0.6-1.0%, the main impurities are Mn, Fe, Si, Cu and Ni, the mass percentage of impurities is 0.005%, and the rest is Mg; the Mg-Zn-Ca alloy ingot with a purity greater than 99.99% The mass percentage of Zn in the composition is 4-5%, the mass percentage of Ca is 1-1.5%, the mass percentage of impurities is 0.005%, and the rest is Mg;
[0036] Step 2: Put the Mg-Al-Zn or Mg-Zn-Ca alloy ingot into the extruder for hot extrusion, the extrusion temperature is 300°C-400°C, the extrusion ratio is 6-10, and the extrusion speed is 20~30mm / s;
[0037] Step 3: Put the hot...
specific Embodiment approach 2
[0043] Embodiment 2: This embodiment differs from Embodiment 1 in that the extrusion temperature in step 2 is 300° C., the extrusion ratio is 6.25, and the extrusion speed is 20 mm / s. The grains of the alloy billet after extrusion can be refined to less than 10 μm, and other steps and parameters are the same as those in the first embodiment.
specific Embodiment approach 3
[0044] Embodiment 3: This embodiment differs from Embodiment 1 in that the extrusion temperature in step 3 is 150° C., the extrusion ratio is 7.25, and the extrusion speed is 17 mm / s. The grains of the alloy billet after extrusion can be refined to less than 5 μm. Other steps and parameters are the same as those in Embodiment 1.
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