Method for preparing medical porous metal implant material
A technology of implant materials and porous metals, which is applied in the field of preparation of medical metal implant materials, can solve the problems of mechanical properties such as ductility, compressive strength, insufficient bending strength, and affect the processing of porous tantalum materials, so as to improve biocompatibility and biological safety, good pore size uniformity of the finished product, and stable preparation process
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Embodiment 1
[0023] Embodiment 1: Take paraffin wax, tantalum powder and ethyl cellulose with an average particle size less than 43 microns and an oxygen content of less than 0.1% and mix them uniformly to form a mixed powder, wherein paraffin wax accounts for 8%, ethyl cellulose accounts for 27%, tantalum powder accounts for 65%, all in volume percentage. Granulation: The mixed powder is granulated into round particles with a particle diameter of 10-13 μm at a working temperature of 510-520° C. and a working pressure of 12-13 MPa. Injection molding: the temperature for injecting the round particles into the mold is 465-490° C. and the pressure is 83-85 MPa. Demolding time: 6~7S. Degreasing treatment: vacuum degree 10 -4 Pa, rise from room temperature to 400°C at a rate of 1-3°C / min, hold for 60-120 minutes, rise from 400°C to 600-800°C at a rate of 1.5-2.5°C / min, and hold for 180-240 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2000°C, the heat...
Embodiment 2
[0025] Embodiment 2: Weigh polyvinyl alcohol, tantalum powder with an average particle size less than 43 microns and an oxygen content of less than 0.1%, and sodium bicarbonate and mix them uniformly to form a mixed powder, wherein polyvinyl alcohol accounts for 6%, sodium bicarbonate accounts for 29%, tantalum Powder accounted for 65%, all in volume percentage. Granulation: The mixed powder was granulated into round particles with a particle diameter of 20 μm at a working temperature of 450° C. and a working pressure of 15 MPa. Injection molding: the temperature of injecting the round particles into the mold is 540° C. and the pressure is 90 MPa. Demolding time: 9S. Degreasing treatment: vacuum degree 10 -4 Pa, raise the temperature from room temperature to 400°C at a heating rate of 1°C / min, and hold for 60 minutes; then raise the temperature from 400°C to 800°C at a heating rate of 2.5°C / min, and hold for 180 minutes. Vacuum sintering: sintering in a vacuum furnace, the ...
Embodiment 3
[0027] Embodiment 3: take by weighing zinc stearate, average particle diameter less than 43 micron oxygen content less than 0.1% tantalum powder and methyl cellulose and mix uniformly into mixed powder, wherein zinc stearate accounts for 10%, methyl cellulose accounts for 10%. 23%, tantalum powder accounted for 67%, both by volume percentage. Granulation: The mixed powder was granulated into circular particles with a particle diameter of 10 μm at a working temperature of 650° C. and a working pressure of 12 MPa. Injection molding: the temperature of injecting the round particles into the mold is 380° C. and the pressure is 72 MPa. Demolding time: 6S. Degreasing treatment: vacuum degree 10 -4 Pa, from room temperature to 400°C at a heating rate of 3°C / min and hold for 120 minutes; then at a heating rate of 1.5°C / min from 400°C to 750°C for 240 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2200°C, the heat preservation is 2.5 hours, an...
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