Uniformly degradable orthopedic implant magnesium alloy material
A magnesium alloy and orthopedic technology, applied in the field of degradable biomedical alloy materials, can solve the problems of magnesium alloys that cannot meet clinical requirements, uneven local degradation, poor osteoinductive ability, etc., achieve ideal in vivo degradation performance, and avoid premature failure , the effect of good comprehensive mechanical properties
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Embodiment 1
[0014] The gravity casting method is used to prepare Mg-Gd-Nd-Sr-Zn-Zr magnesium alloy ingots, and its components and weight percentages are Gd 1%, Nd 2%, Sr 0.1%, Zn 0.1, Zr 0.5, The remainder is Mg. The purity of magnesium in the raw material is 99.95%, the purity of Zn is 99.999%, and the addition of Gd, Nd, Sr and Zr is based on Mg-30%Gd, Mg-30%Nd, Mg-25%Sr and Mg-30%Zr respectively Added in the form of binary master alloy, their purity is more than 99.95%. The degradation rate of the as-cast alloy in simulated body fluid containing glucose was 0.25 mm / year, and the degradation was uniform. Cytotoxicity results showed that the alloy had no cytotoxicity to osteoblasts. After solution treatment (540 ℃, 10 h) and extrusion deformation processing (extrusion temperature 270 ℃, extrusion ratio 9, extrusion speed 2 mm / min) of the alloy, its tensile strength at room temperature can be Up to 410 Mpa, the elongation rate is 9%.
Embodiment 2
[0016] The Mg-Gd-Nd-Sr-Zn-Zr magnesium alloy ingot is prepared by gravity casting, and its components and weight percentages are Gd0.5%, Nd1.5%, Sr0.5%, Zn0.2, Zr0 .3, the rest is Mg. The purity of magnesium in the raw material is 99.95%, the purity of Zn is 99.999%, and the addition of Gd, Nd, Sr and Zr is based on Mg-30%Gd, Mg-30%Nd, Mg-25%Sr and Mg-30%Zr respectively Added in the form of binary master alloy, the purity is greater than 99.95%. The degradation rate of the as-cast alloy in the simulated body fluid containing glucose was 0.28 mm / year, and the degradation was uniform. Cytotoxicity results showed that the alloy had no cytotoxicity to osteoblasts. After solution treatment (540 ℃, 10h) and extrusion deformation processing (extrusion temperature 380 ℃, extrusion ratio 9, extrusion speed 8 mm / min) of the alloy, its tensile strength at room temperature can reach 280Mpa, the elongation rate is 20%.
Embodiment 3
[0018] The Mg-Nd-Sr-Zn-Zr magnesium alloy ingot is prepared by gravity casting, and its components and weight percentages are Nd5%, Sr2%, Zn0.3, Zr1, and the rest is Mg. The purity of magnesium in the raw material is 99.95%, the purity of Zn is 99.999%, and the addition of Nd, Sr and Zr is added in the form of Mg-30%Nd, Mg-25%Sr and Mg-30%Zr binary master alloys respectively, The purity is greater than 99.95%. The degradation rate of the as-cast alloy in simulated body fluid containing glucose was 0.35 mm / year, and the degradation was uniform. Cytotoxicity results showed that the alloy had no cytotoxicity to osteoblasts. After solution treatment (540 ℃, 10h) and extrusion deformation processing (extrusion temperature 320 ℃, extrusion ratio 9, extrusion speed 8 mm / min) of the alloy, its tensile strength at room temperature can reach 300Mpa, the elongation rate is 28%.
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