Degradable Zn-Ag series zinc alloy and preparing method and application thereof

Abstract

The invention provides a degradable Zn-Ag series zinc alloy and a preparing method and application thereof. The zinc alloy is composed of Zn, Ag and a microelement. The mass percent of the Zn ranges from 89.85 to 99.4%, the mass percent of the Ag ranges from 0.01 to 10%, and microelement comprises one or multiple of Fe, Mg, Ca, Sr and Li. The mass percent of the microelement ranges from 0.01 to 0.55%. The method comprises the steps of heating metal zinc to be molten after burdening, adding metal silver, performing stirring until the metal silver is molten, adding the microelement, performing stirring, standing and pouring, and obtaining a zinc alloy cast ingot; and performing heat treatment and heat preservation on the zinc alloy cast ingot, and finally performing extrusion forming. The made zinc alloy has the higher strength and ultra-high plasticity, good anti-bacterium effect is achieved, and the alloy can serve as a degradable medical device implant to be applied into the human body to be subjected to non-toxic degradation.

Description

technical field [0001] The invention relates to the field of preparation of biomedical materials, in particular to a degradable Zn-Ag zinc alloy and its preparation method and application. Background technique [0002] Bioabsorbable metals are considered revolutionary biomedical materials and have been extensively investigated for vascular and orthopedic applications over the past two decades. The concept of an absorbable stent is to keep the occluded artery open during remodeling and to degrade harmlessly when its mechanical stent is no longer needed. [0003] Currently, magnesium-based, iron-based, and zinc-based alloys are used for biodegradable materials. Among them, although the degradation rate of the magnesium-based alloy is fast, its mechanical properties are poor and the corrosion is uneven. Although the mechanical properties of iron-based alloys are good, the degradation rate is too slow to reach the standard value. Zinc-based alloys are between the two in terms...

AI Technical Summary

Problems solved by technology

[0005] Pure zinc and its alloys are also degradable materials in the human body environment, but there are still shortcomings such as insufficient mechanical strength and uncontrollable degradation rate when applied to medical materials.

Chinese patent 201310756776.1 discloses a corrosion-resistant high-strength zinc alloy implant material that can be absorbed by the human body. Ce, Mg, Cu, and Ca are added to zinc to improve mechanical properties and control the degradation rate, but the prepared zinc alloy material has low plasticity

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