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.