| 摘要 |
<p>A medical porous metal material for weight-bearing bone tissue replacement and a preparation method therefor, prepared as follows: mixing tantalum powder, a pore-forming agent, and a forming agent, press-forming the powder mixture into an organic foamed body, then degreasing, sintering, cooling, and performing a heating process. The pressure used during the press-forming is 50 to 100 Mpa. The degreasing process comprises: gradually increasing the temperature to 400 to 800°C at a speed of 0.3 to 2°C/min, introducing argon gas to form a protective atmosphere, and maintaining the temperature for 300 to 360 minutes. The pore-forming agent is ammonium bicarbonate or hydrogen peroxide. The forming agent is one or multiple of stearic acid, zinc sterate, paraffin, and synthetic resin. The medical porous tantalum material produced has a diameter of 100 to 500 mum, a porosity of 55% to 65%, an elastic modulus of 3.8 to 4.2 Gpa, and an elongation rate of 9.3% to 10.7%. The final porous tantalum material prepared using the preparation method of the present invention has a low impurity concentration, thereby effectively solving the conflict that the medical porous tantalum material for weight-bearing part replacement must have both high porosity and good mechanic properties.</p> |
