A kind of porous titanium bone nail and the method for forming and sintering the porous titanium bone nail by gel injection molding
A technology of gel injection molding and porous titanium, which is applied in the field of porous titanium bone nails, can solve the problems of high strength, complicated preparation process, and low elastic modulus, and achieve shortened sintering time, simple process, and reasonable pore size distribution. Effect
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Embodiment 1
[0049] 1) Dissolve 7g of agar and 2g of hydroxypropyl methylcellulose in 400g of deionized water and stir at 100°C for 0.5 hours to form a premix;
[0050] 2) Take 500g Ti6Al4V powder with a particle size of 15-60μm, add 0.5g TergitolTM, 2g Triton and 1g ovalbumin into the premix, and stir at 200r / min for 15min.
[0051] 3) Inject the slurry into the mold, cool at 5°C for 2 hours, and dry at 25°C for 10 days;
[0052] 4) The pre-sintering process of porous titanium is carried out at a flow rate of 500 sccm of high-purity argon, the pre-sintering temperature is 450°C, and the pre-sintering time is 3.5h. Reach 1200°C, formally sinter at 1200°C, and hold for 1 hour.
[0053] After sintering, it is further processed to obtain a porous titanium bone screw with an average porosity of 30% and an average pore size of 325 μm, and the bone screw has threads. When the bone nail is bent more than 120° without breaking, its bending strength is 175MPa, torsional strength is 140MPa, compre...
Embodiment 2
[0055] 1) Dissolve 10g of agar and 2g of hydroxypropyl methylcellulose in 400g of deionized water and stir at 100°C for 2 hours to form a premix;
[0056] 2) Add 700g of Ti6Al7Nb powder with a particle size of 15-60μm, 2g of TergitolTM, 2g of Triton and 3g of egg white liquid into the premix, and stir for 15min at a speed of 300r / min.
[0057] 3) Inject the slurry into the mold, cool at 0°C for 1.5h, and dry at 35°C for 8 days
[0058] 4) The pre-sintering process of porous titanium is carried out at a flow rate of 700 sccm of high-purity argon, the pre-sintering temperature is 480 ° C, and the pre-sintering time is 3.5 hours. Reach 1300°C, formally sinter and hold for 2.5 hours
[0059] After sintering, it is further processed to obtain a porous titanium bone screw with an average porosity of 42% and an average pore size of 412 μm, and the bone screw has threads. Bending the bone nail more than 120° without breaking, its bending strength is 120MPa, torsional strength is 110...
Embodiment 3
[0063] 1) Dissolve 8g of agar and 2g of hydroxypropyl methylcellulose in 350g of deionized water and stir at 60°C for 2 hours to form a premix;
[0064] 2) Take 500g of Ti8Fe8Ta powder with a particle size of 15-60μm, add 15g TergitolTM and 4g Triton into the premix, and stir at a speed of 300r / min for 20min.
[0065] 3) Inject the slurry into the mold, cool at 10°C for 4 hours, and dry at 40°C for 7 days
[0066] 4) The pre-sintering process of porous titanium is carried out at a flow rate of 1000 sccm of high-purity argon, the pre-sintering temperature is 550 ° C, and the pre-sintering time is 3 hours. 1300°C, officially sintered and held for 4 hours
[0067] After sintering, a porous titanium bone screw with an average porosity of 43% and an average pore size of 458 μm was obtained by further processing, and the bone screw had threads. When the bone nail is bent more than 120° without breaking, its bending strength is 108MPa, torsional strength is 102MPa, compressive stre...
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