Ti6Al4V alloy and orthopaedic implant prepared from alloy

Abstract

The invention relates to a Ti6Al4V alloy which comprises the following elements in percentage by mass: 5.5-6.75% of Al, 3.5-4.5% of V, at most 0.3% of Fe, 0.02-0.1% of O, at most 0.08% of C, at most 0.05% of N, at most 0.015% of H and the balance of Ti. The invention also relates to an orthopaedic implant prepared from the alloy. The orthopaedic implant prepared from the Ti6Al4V alloy can effectively lower the infection of the human body.

Description

technical field [0001] The invention relates to a metal alloy, in particular to a Ti6Al4V alloy and an orthopedic implant prepared from the alloy. Background technique [0002] Ti6Al4V alloy has excellent mechanical properties, corrosion resistance and biocompatibility, and is an ideal surgical implant material. There are many studies on new medical materials, but Ti6Al4V alloy is still the most mature and widely used titanium alloy for surgical implants at home and abroad. Internal fixation screws, patella, hip and acetabulum etc. [0003] In foreign countries, Ti6Al4V alloys have been applied in the medical field as early as the 1950s and 1960s. American surgical implants use low-gap Ti6Al4V alloys. Ti6Al4V alloys are also included in the ISO-5832-3 international standard, and Ti6Al4V is given alloy composition. The domestic standard GB / T13810-2007 titanium and titanium alloy processing materials for surgical implants also clearly pointed out that the composition of Ti6...

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN103628052A discloses that when the Ti6A14V alloy artificial bone is in the human body fluid environment for a long time, a defensive and protective titanium dioxide film will be formed spontaneously on the surface, and the generated TiO2 2 The film has poor stability and durability, and is likely to be peeled off or even dissolved in the human body, resulting in the precipitation of toxic elements A1 and V in the Ti6A14V alloy, and with this layer of TiO 2 The destruction of the thin film, the corrosion effect on the surface of Ti6A14V alloy will be intensified

Due to the problems of wear, corrosion and implant infection in Ti6A14V alloy, artificial bone implants often fail

In the above two standards, the Ti6A14V alloy has given the limit of oxygen content not exceeding 0.2% by mass fraction and the limit range of other trace elements. Reasonable control range has always troubled people to find the problem of avoiding human infection caused by Ti6A14V alloy. For example, CN103628052A patent forms a titanium dioxide film on the surface of titanium alloy microporous bone to avoid human infection, which greatly increases the cost