Graded ordered porous TiAg alloy preparation method

Abstract

The invention relates to a graded ordered porous TiAg alloy preparation method, which belongs to the technical field of biomedical material preparation. Flat shuttle Ti powder and the Ag powder are weighed according to the required proportion and are ball-milled to acquire composite powder. Acquired Ti-Ag composite powder is mechanically pressed into a center bar blank. The center bar blank and a fixator are combined and placed into a graphite mold, and the surrounding is filled with spherical Ti powder of the equal height. Punches are added to the mold up and down. Placing into a discharge plasma sintering furnace is carried out. The system is vacuumized to 2 to 6 Pa. According to a step heating method, the blank is heated to the first level graded temperature 600 to 800 DEG C at the heating rate of 80 DEG C / min, and then heat preservation is carried out for 3 to 5min; the blank is heated to the second level graded temperature 800 to 1000 DEG C at the heating rate of 50 to 80 DEG C / min, and then heat preservation is carried out for 10 to 15min; and demolding is carried out to acquire graded ordered porous TiAg alloy. The graded ordered porous TiAg alloy prepared by the method provided by the invention has the characteristics of good antibacterial property, biological activity and high strength, and is especially suitable for human body hard tissue defects in biomedical engineering, such as artificial joint, artificial bone, dental implant and the like.

Description

technical field [0001] The invention relates to a preparation method of a gradient ordered porous TiAg alloy, belonging to the technical field of preparation of biomedical materials. Background technique [0002] With the improvement of medical level, the requirements for mechanical properties, biocompatibility and biological activity of implanted biomedical materials for human body are getting higher and higher. Therefore, for biomedical titanium (Ti) implants, in addition to meeting the necessary mechanical properties, wear resistance and corrosion resistance, and biological safety, good osteogenic activity and antibacterial properties are also required. Since products made from a single biomaterial cannot well meet clinical applications, it has become a new direction for biomedical materials to synthesize biomaterials with different advantages into gradient materials with multiple functions using reasonable technology. [0003] Silver (Ag) has been proved to have good bi...

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Problems solved by technology

However, since the elastic modulus of dense TiAg alloy (about 100 GPa) is still much higher than that of human bone (Young's modulus of cancellous bone ≤ 2GPa, compact bone Young's modulus of 2-20GPa), after implantation It can cause a series of complications such as bone resorption, atrophy and loosening of the prosthesis, so it has not been applied clinically

For the above reasons, some scholars introduced pores into TiAg alloy (see literature: Hou L, Li L, Zheng Y. Fabrication and Characterization of Porous Sintered Ti–Ag Compacts for Biomedical Application Purpose[J]. Journal of Materials Science & Technology, 2013 , 29(4):330-338.), although the elastic modulus is reduced, its compressive strength and corrosion resistance are also greatly reduced, and it cannot be used in bone implants that need to be loaded. Moreover, in sintering must also be added like urea, polyvinyl alcohol or NH 4 HCO 3 Porogens such as urea are easy to react with Ti in the matrix to form TiN, polyvinyl alcohol has been proven to be toxic to liver and gallbladder tissue, and according to the American Standards Association ASTM F2063, the residues of N and C in biological materials should not exceed 500ppm

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