The invention belongs to the technical field of high-performance medical
alloy materials and particularly relates to a medical
zirconium alloy high in surface
wear resistance and integral tenacity and a preparation method and application thereof. The surface of the medical
zirconium alloy is provided with a micron-level thick
oxide ceramic layer is mainly composed of nonoclinic-
system zirconia and a small amount of tetragonal-
system zirconia; the matrix of the medical
zirconium alloy is
zirconium alloy, which is specifically composed of, by weight percentage, 76.5-100 wt.% of Zr, 0-19 wt.% of Nb, 0-4.5 wt.% of Hf and inevitable trace impurities as balance; an
oxygen-enriched
transition layer is arranged between the
oxide ceramic layer and the matrix alloy, namely,
oxygen is dissolved inside the matrix to form zirconium-
oxygen solid solution. The high-wear-resistance and high-tenacity medical
zirconium alloy combines the plastic deformation technology and the high-temperature oxidation technology and greatly improves the surface
hardness, the
wear resistance and the alloy strength, thereby having a broad application prospect in
biomedicine, particularly in the aspect of biomedical implants.