| 摘要 |
A preparation method for a medical porous tantalum material comprising mixing tantalum powder and an aqueous solution of polyglycolic into a slurry, injecting the slurry into an organic foamed body by using pressuring by vibration, then drying, degreasing, sintering, cooling, and performing a heating process; the mass concentration of the aqueous solution of polyglycolic is 2% to 8%, and the vibration frequency is 20 to 80 times/minute; the sintering step comprises: within a vacuum degree of 10-4 to 10-3 Pa, increasing the temperature to 1500 to 1800°C at a speed of 10 to 20°C/min, maintaining the temperature for 120 to 240 minutes, cooling together with the furnace to 200 to 300°C, increasing the temperature to 1500 to 1800°C at a speed of 10 to 20°C/min, maintaining the temperature for 180 to 240 minutes, increasing the temperature to 2000 to 2200°C at a speed of 5 to 10°C/min, and maintaining the temperature for 120 to 360 minutes; the heating process step comprises: within a vacuum degree of 10-4 to 10-3 Pa, increasing the temperature to 800 to 900°C at a speed of 10 to 20°C/min, maintaining the temperature for 240 to 480 minutes, cooling to 400°C at a speed of 2 to 5°C/min, maintaining the temperature for 120 to 300 minutes, and cooling together with the furnace to room temperature. The porous tantalum prepared using the present method is suitable as a medical implant material for weight-bearing bone tissue replacement, and ensures both biocompatibility and mechanic properties. |
