PREPARATION METHOD FOR MEDICAL POROUS METAL MATERIAL FOR DENTAL BONE REPLACEMENT

摘要

A preparation method for a medical porous metal material for dental bone replacement: mixing tantalum powder, a pore-forming agent, and a forming agent into a powder mixture, press-forming the powder into an organic foamed body, then degreasing, sintering, cooling, and performing a heating process to produce the porous tantalum material. The pressure used during the press-forming is 50 to 100 Mpa. The pore-forming agent is one of or a combination of urea, sodium chloride, ethyl cellulose, and methyl cellulose. The forming agent is one of or a combination of stearic acid, zinc stearate, paraffin, and synthetic rubber. Measurements show that the porous tantalum material prepared using the preparation method has an impurity concentration lower than 0.2%. The density reaches 11.67 to 13.34 g/cm³, the porosity reaches 20% to 30%, and the pore diameter reaches 5 to 30 μm. The elastic modulus reaches 4.5 to 6.0 Gpa, the bending strength reaches 110 to 130 Mpa, and the compressive strength reaches 100 to 130 Mpa. The porous tantalum prepared using the method is applicable as a medical implant material for dental bone replacement.