Degradable magnesium alloy formed blank, preparation equipment and preparation method thereof and pressurizing screw prepared from formed blank

Abstract

The invention provides a degradable magnesium alloy formed blank, preparation equipment and a preparation method thereof and a pressurizing screw prepared from the formed blank. The degradable magnesium alloy formed blank is prepared from the following components in percent by weight based on the total weight of the formed blank: 0.6-4% of Zn, 0.01-2% of Ca (the total weight of Zn and Ca is smaller than 5%) and the balance Mg and inevitable impurities, wherein the other impurity elements account for being smaller than or equal to 0.01% by mass, the tensile strength of the formed blank is not smaller than 400 MPa, the yield strength is not smaller than 320 MPa and the ductility is greater than 10%. The degradable magnesium alloy formed blank has excellent tensile strength and yield strength. The preparation method can refine grains, homogenize textures and improve the strength of a rod, and the pressurizing screw prepared from the formed blank has high strength and can be applied to wider fields.

Description

technical field [0001] The invention relates to a workpiece and a preparation method thereof, in particular to a forming blank of a degradable magnesium alloy, a preparation method thereof and a pressure screw prepared from the forming blank. Background technique [0002] The metal materials used in traditional bone nails include stainless steel, cobalt-based alloys, titanium and titanium alloys, and medical precious metals. During use, it was found that the above-mentioned materials will be accompanied by the following problems after being implanted into the human body: [0003] (1) Medical cobalt-based alloys and medical titanium alloys will dissolve metal ions (such as Cu, V, Mo, Ni, Al, etc.) after implantation into the human body, causing inflammatory reactions or necrosis of cells. [0004] (2) The elastic modulus difference between medical stainless steel biomaterials and human bone is too large, which easily causes stress shielding effect. [0005] (3) The metal imp...

AI Technical Summary

Problems solved by technology

[0004] (2) The elastic modulus difference between medical stainless steel biomaterials and human bone is too large, which is easy to cause stress shielding effect

[0005] (3) The metal implant materials mentioned above are all non-degradable. When the human bone is healed, the implant needs to be taken out for another operation; if not taken out, these metal parts will accompany the patient for life, slowly corroding in the body, causing other adverse symptoms

Although the rods prepared by this process have excellent mechanical properties and fine structure, the strains of the core and edge of the same section of the rod prepared by swaging are quite different, resulting in large differences in grain size and uneven structure.

[0013] Therefore, although many existing methods have disclosed the process of strengthening the mechanical strength of magnesium alloy materials, there are some insurmountable defects in various processes. In view of this, the inventor proposes the present invention with a disposable Solve the problems mentioned in the aforementioned process

Images