Zn-RE series zinc alloy as well as preparation method and application thereof

Abstract

The invention discloses a Zn-RE series zinc alloy as well as a preparation method and application thereof. The main element of the material of the Zn-RE series zinc alloy is Zn, and the alloy elementis one of non-radioactive rare earth elements RE; the mass percentage of RE is 0%-3% but not including 0; the balance is zinc; and the non-radioactive rare earth element RE comprises Sc, Y, 139La, Ce,Pr, Nd, 150Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and 175Lu. According to the Zn-RE series zinc alloy as well as the preparation method and application thereof, compared with rare earth-containing multi-element zinc alloy in the prior art, the alloy components of the Zn-RE series zinc alloy are reduced, the preparation process flow is simplified, the adjustment of the microstructure in the material and the regulation and control of the performance can be realized through different processing technologies, the mechanical property is greatly improved, meanwhile, the biocompatibility is good, and the Zn-RE series zinc alloy can be used for preparing degradable medical implants.

Description

technical field [0001] The invention relates to the field of medical metal materials, in particular to a Zn-RE zinc alloy and its preparation method and application. Background technique [0002] Traditional medical metal materials, such as stainless steel, cobalt alloys, titanium alloys, etc., have good mechanical properties and corrosion resistance; however, implants made of these metal materials need to be removed by a second operation, otherwise they will remain in the body for a long time Retention, causing varying degrees of stimulation to surrounding tissues. For example, the elastic modulus of fracture internal fixation materials is much larger than that of human bones, and there is a problem of "stress shielding", which makes fracture healing slow, and may even cause secondary fractures. Cardiovascular stents can cause intimal hyperplasia and in-stent restenosis. In addition, due to long-term wear and tear, harmful ions dissolved in metals may cause inflammation a...

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Problems solved by technology

[0006] Patent CN104651664B discloses a human body-degradable corrosion-resistant high-strength Zn-Fe-RE zinc alloy. This alloy adds iron (Fe) and rare earth (RE) as alloying elements to the Zn matrix, and can be controlled by adjusting the content of iron. The degradation rate of degraded metals; however, the elongation at break of this series of alloys is mostly within 15%, which is difficult to meet the needs of clinical applications

Patent CN103736152B discloses a degradable strong and tough zinc alloy, adding Ce, Mg, Ca, and Cu as alloying elements to the Zn matrix, but the plasticity of this alloy is still very low, and it is difficult to meet clinical needs

[0007] At present, there are no literature and patent reports on the synthesis, preparation and performance characterization of binary Zn-RE alloys at home and abroad, and there is no precedent for using Zn-RE alloys in the field of degradable biomedical materials.

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