| 摘要 |
A preparation method for a medical porous tantalum implant material sintered using the foam immersing method. Using tantalum powder and a solution prepared with an organic adhesive agent and a dispersant agent to produce a tantalum powder slurry, casting the slurry into an organic foamed body, keeping immersed till the pores of the organic foamed body are filled completely with the tantalum powder slurry, drying to remove the dispersant agent in the organic foamed body into which the tantalum powder slurry is cast, performing a degreasing process to remove the organic adhesive agent and the organic foamed body within an inert gas protective atmosphere, sintering within a vacuum to produce a porous sintered body, cooling, vacuum-annealing, and performing conventional post-processing to produce the porous tantalum; the heating process 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 material prepared using the present invention has good biocompatibility, safety, and highly strong mechanic properties, and is very suitable for bone tissue replacement of human weight-bearing parts. |
