Degradable and high-toughness composite material and preparation method thereof

Abstract

The invention belongs to the technical field of alloy materials, and discloses a degradable and high-toughness composite material and a preparation method thereof. The composite material comprises a zinc alloy layer, an intermediate alloy layer and a magnesium alloy layer, wherein the intermediate alloy layer is composed of a magnesium-zinc alloy, the zinc alloy layer does not contain Mg, the magnesium alloy layer does not contain Zn, the zinc alloy layer is composed of a zinc alloy, the zinc alloy further comprises Y and/or Nd, the magnesium alloy layer is composed of a magnesium alloy, the magnesium alloy further comprises Y and/or Nd, and the magnesium-zinc alloy comprises the following components in percentage by mass: 50-80% of Mg and 20-50% of Zn. Due to the existence of the intermediate alloy layer in the composite material, the connection between the zinc alloy layer and the magnesium alloy layer is enhanced, the mechanical property of the composite material is improved, and particularly, an elastic modulus of the composite material is obviously reduced relative to an elastic modulus of the zinc alloy, so that the healing of bone tissues is not influenced, and a degradationrate of the composite material in a human body is reduced.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, in particular to a degradable, strong and tough composite material and a preparation method thereof. Background technique [0002] Degradable magnesium alloys have good biocompatibility and are well applied in the field of medical implant devices, but there are the following problems: 1. The degradation rate of magnesium alloys in the human body is too fast. When magnesium alloys support or When connecting, because the degradation rate of magnesium alloy is too fast, it is not conducive to the recovery of some diseases; 2. In order to overcome the first problem, it is usually necessary to make magnesium alloy and other alloy materials into a composite material to reduce its degradation rate, however This in turn makes the mechanical properties of the composite insufficient. For example, the elastic modulus of the composite material is too high (>50GPa), resulting in a "stress shieldin...

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Problems solved by technology

[0002] Degradable magnesium alloys have good biocompatibility and are well applied in the field of medical implant devices, but there are the following problems: 1. Magnesium alloys are used in The degradation rate in the human body is too fast. When the magnesium alloy plays a supporting or connecting role in the body, the degradation rate of the magnesium alloy is too fast, which is not conducive to the recovery of some diseases; 2. In order to overcome the first problem, it is usually necessary to combine magnesium alloys with Other alloy materials are made into composite materials together to reduce its degradation rate, but this makes the mechanical properties of co

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