Preparation method of medical porous metal material capable of replacing weight bearing bone tissue
A technology of porous metal and bone tissue, applied in medical science, prosthesis, etc., can solve the problems of reduced biological safety, insufficient purity of finished products, carbon skeleton residues, etc., to achieve improved mechanical properties, high yield of finished products, and pore distribution uniform effect
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Embodiment 1
[0024] Example 1: Weigh zinc stearate, tantalum powder with an average particle size less than 43 microns and oxygen content less than 0.1% and hydrogen peroxide and mix evenly, wherein zinc stearate accounts for 11%, hydrogen peroxide accounts for 18%, and tantalum powder accounts for 71%. All are calculated by volume percentage. Pressure molding: Add the above mixed powder into an injection molding machine and press it into a polyurethane foam (pore diameter 0.48-0.89mm, density 0.015 g / cm2) at 87Mpa 3 ~0.035g / cm 3 , the hardness is greater than 50 0 ) in forming. Degreasing treatment: vacuum degree 10 -3 Pa, from room temperature to 400°C at a heating rate of 1.4°C / min and hold for 311 minutes; then at a heating rate of 0.4°C / min from 400°C to 750°C for a holding time of 350 minutes. Vacuum sintering: vacuum degree is 10 -3 Pa, heat up to 1800°C at 13°C / min, hold for 200min, cool with the furnace to 200-300°C, then heat up to 1800°C at 17°C / min, hold for 230min, heat u...
Embodiment 2
[0026] Embodiment 2: Weigh stearic acid and paraffin, tantalum powder with an average particle size less than 43 microns and oxygen content less than 0.1% and hydrogen peroxide and mix evenly, wherein stearic acid accounts for 9%, paraffin accounts for 3%, hydrogen peroxide accounts for 25%, tantalum Powder accounts for 63%, all in volume percentage. Pressure molding: Add the above mixed powder into an injection molding machine and press it into a polyurethane foam (pore diameter 0.48-0.89mm, density 0.015 g / cm2) at 75Mpa 3 ~0.035g / cm 3 , the hardness is greater than 50 0 ) in forming. Degreasing treatment: vacuum degree 10 -4 Pa, from room temperature to 600°C at a heating rate of 0.3°C / min, and hold for 360min. Vacuum sintering: vacuum degree is 10 -4 Pa, heat up to 1500°C at 10°C / min, hold for 240min, cool with the furnace to 200-300°C, then heat up to 1500°C at 20°C / min, hold for 180min, heat up to 2000-2200°C at 10°C / min, Keep warm for 120min and cool down. Heat tr...
Embodiment 3
[0028] Embodiment 3: Take isoprene rubber, tantalum powder with an average particle size less than 43 microns and an oxygen content of less than 0.1% and ammonium bicarbonate and mix evenly, wherein isoprene rubber accounts for 7%, ammonium bicarbonate accounts for 15%, and tantalum powder accounts for 78% %, all in volume percentage. Pressure molding: Add the above mixed powder into an injection molding machine and press it into a polyurethane foam (pore diameter 0.48-0.89mm, density 0.015 g / cm2) at 96Mpa 3 ~0.035g / cm 3 , the hardness is greater than 50 0 ) in forming. Degreasing treatment: vacuum degree 10 -4 Pa, from room temperature to 400°C at a heating rate of 2°C / min, and hold for 300min. Vacuum sintering: vacuum degree is 10 -3 Pa, heat up to 1700°C at 20°C / min, hold for 120min, cool with the furnace to 200-300°C, then heat up to 1670°C at 10°C / min, hold for 240min, heat up to 2000-2200°C at 5°C / min, Keep warm for 360min and cool down. Heat treatment: vacuum deg...
PUM
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