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Tantalum Long-term Fixation
Oct 20, 2017

Joint implants are generally divided into two kinds of bone cement fixed and biological fixation, biocompatible joint prosthesis because of its relatively simple operation, Tantalum the fixation effect will not weaken with time and other advantages, by many patients and doctors welcome. Tantalum metal joint implants are a kind of biocompatible prosthesis, tantalum metal, also known as bone trabecular metal, which through a good friction fit and initial implant stability provides bone - prosthetic interface of high friction. In addition, its high degree of porosity and support structure provides a wide range of bone into the space, to ensure the long-term fixation of the prosthesis.

The results show that with the increase of the tantalum content in the alloy from 1% to 6.4%, the tensile strength increases at 760 ℃, the plasticity improves, Tantalum the creep resistance is improved, and the creep rupture time is improved. The tantalum content on the mechanical properties and microstructure of the K409 alloy shows that extend. The tantalum in the alloy enters the γ 'phase, increases the γ' phase, the number and the dissolution temperature of the γ 'phase, changes the composition of the γ' phase, the size of the γ 'phase, increases the γ' phase precipitation strengthening effect, In order to distinguish the effect of solid solution strengthening and precipitation strengthening, the components containing Ta and Ta-free γ-austenite were analyzed by phase analysis, respectively, and the contents of Ta and Ta-free The content of austenite matrix alloy in γ austenite is increased from 30% to 38.5% by the sum of Cr + Co + Mo. K409 alloy matrix containing 1% Ta, these large Ta atoms, Tantalum combined with increased content of Cr, Co and Mo atoms, is bound to cause a large elastic stress field, while the γ austenite matrix layer error The creep life of the Ta-containing austenitic matrix alloy is greatly prolonged, Tantalum and the creep plasticity is improved obviously, that is, the solid solution strengthening of Ta and the increase of Cr, Co and Mo contents caused by Ta. At the same time, the instantaneous tensile strength and plasticity are also greatly improved. Ta also significantly improved the thermal corrosion resistance and hot and cold fatigue properties of the alloy. In the range studied, the higher the Ta content, the better the thermal corrosion resistance and the hot and cold fatigue resistance. In the cobalt-based sheet alloys MM-918 and S-57 used at high temperatures, W has been successfully substituted for W, and the oxidation resistance is remarkably improved.

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