Preparation method for controllable degradation type zinc-magnesium gradient material

Abstract

The invention relates to a preparation method for a controllable degradation type zinc-magnesium gradient material, belongs to the technical field of preparation and application of medical biomaterials. According to the preparation method, the problem that a single homogeneous material can hardly meet the application requirement of the diversity of a degradable implant material can be solved, magnesium powder and zinc powder serve as raw materials, and the controllable degradation type zinc-magnesium gradient material is developed through a preparation technology of powder preparation, ball-milling and powder mixing, powder laying, pre-pressing forming and spark plasma sintering; the density of the material is 3.58 g / cm<3>, the compactness reaches 98.2%, the compressive strength is about 261 MPa, the bending strength is 114 MPa, the bending modulus is 7.1 GPa, the material is matched with bone tissue of a human body in performance, the stress shielding effect can be effectively avoided, and the performance requirement of a hard tissue implant of the human body can be met; and meanwhile, the gradient material is soaked and corroded, has good corrosion resistance at the early stage and has the characteristic of obviously increased corrosion rate in the later stage, and the unique functional requirements that the outer layer material is corrosion-resistant at the initial stage ofimplantation, can ensure the mechanical property and is rapidly degraded in the later stage of implantation can be met.

Description

technical field

[0001] The invention relates to a preparation method of a controllable degradable zinc-magnesium gradient material, which belongs to the technical field of preparation and application of medical biological materials. Background technique

[0002] The support material for hard tissue structure repair is a kind of biological material with early development, mature technology and deep research. It is usually used as a bone filling material to reconstruct the defective part of human bone tissue, and it is very effective in restoring the physiological functions of pathological and traumatic bone defects. Traditional support materials for hard tissue repair are mainly titanium alloys, stainless steel, cobalt-based alloys, and pure metals (tantalum, niobium), all of which have good corrosion resistance, but long-term implantation in the human body will also cause many adverse effects. The elastic modulus of titanium alloy and stainless steel is much higher than tha...

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