Binary Titanium-Zirconium Alloy for Surgical Implants and a Suitable Manufacturing Process
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Abstract
The present invention relates to a binary single phase titanium-zirconium alloy suitable for the production of surgical implants. The alloy includes a zirconium content of less than 25% but more than 5% by weight, and 0.1% to 0.3% by weight of oxygen as a strength enhancing additive, and not more than 1% by weight of other strength enhancing additives and technical impurities.
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Citations
22 Claims
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1-10. -10. (canceled)
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11. A binary single phase titanium-zirconium alloy suitable for the production of surgical implants, said alloy comprising a zirconium content of less than 19% by weight but more than 10% by weight, 0.1% to 0.3% by weight of oxygen as a strength enhancing additive and not more than 1% by weight of other strength enhancing additives and technical impurities, the alloy being obtainable by a process involving the following steps:
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(i) hot forging said alloy at a temperature above alpha/beta phase transition; and (ii) rapidly cooling said alloy to obtain the single phase titanium-zirconium alloy; wherein said alloy is subsequently cold processed. - View Dependent Claims (12, 13, 15, 16, 17, 19, 22)
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14. A process for producing a surgical implant, said process comprising incorporating into said implant a binary single phase titanium-zirconium alloy, said alloy comprising a zirconium content of less than 19% by weight but more than 10% by weight, 0.1% to 0.3% by weight of oxygen as a strength enhancing additive and not more than 1% by weight of other strength enhancing additives and technical impurities, the alloy being obtainable by a process involving the following steps:
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(i) hot forging said alloy at a temperature above alpha/beta phase transition; and (ii) rapidly cooling said alloy to obtain the single phase titanium-zirconium alloy; wherein the forging process is carried out at temperatures above 850°
C., the alloy is then cooled rapidly and subsequently cold worked.
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18. A process for producing a surgical implant, said process comprising incorporating into said implant a binary single titanium-zirconium alloy, said alloy comprising a zirconium content of less than 19% by weight but more than 10% by weight, 0.1% to 0.3% by weight of oxygen as a strength enhancing additive and not more than 1% by weight of other strength enhancing additives and technical impurities, said process comprising:
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(a) forging the alloy in the range of alpha/beta phase transition at 770°
C. to 830°
C.;(b) cooling the alloy rapidly; and (c) cold working the alloy.
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20. A surgical implant comprising a binary single phase titanium-zirconium alloy, said alloy comprising a zirconium content of less than 19% by weight but more than 10% by weight, 0.1% to 0.3% by weight of oxygen as a strength enhancing additive and not more than 1% by weight of other strength enhancing additives and technical impurities, the alloy being obtainable by a process involving the following steps:
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(i) hot forging said alloy at a temperature above alpha/beta phase transition; and (ii) rapidly cooling said alloy to obtain the single phase titanium-zirconium alloy; wherein said alloy is subsequently cold processed. - View Dependent Claims (21)
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Specification