Porous medical metal implant materials have important and special uses in the treatment of bone tissue trauma and femoral tissue necrosis, and now common such materials include porous metal stainless steel, porous metal titanium, etc. Used as bone tissue trauma and tissue necrosis femoral treatment of porous implant materials, should be up to 30 ~ 80%, the porosity and pore best all connected with uniform distribution, or pore part connected with uniform distribution according to need, make it is consistent with the body's bone growth, and reduce the weight of the material itself, the implants used to fit the human body.
Due to its excellent biocompatibility and mechanical properties, the porous tantalum metal is expected to replace the above-mentioned traditional medical metal biomaterials and become a biological material mainly used for the treatment of bone tissue necrosis. As tantalum is harmless, non-toxic and has no side effects on human body, and with the rapid development of medicine at home and abroad, tantalum is further recognized as a human body implant material, people's demand for porous tantalum for human body implant is becoming more and more urgent, and the requirements for it are also becoming higher and higher. As porous medical implant metal tantalum, if it has a high uniform distribution of connected pores and physical and mechanical properties suitable for human body, it is an important connecting material to ensure the normal growth of newborn bone tissue.
As medical implant of porous metal materials like general porous metal material is basically a powder sintering, the main processing methods, especially for pore connectivity and uniform distribution of porous metal foam structure using metal powder in the powder sintering, the slurry On the organic foam immersion after drying and sintering or foam immersion method. Generally, the metal mechanical properties of porous metal materials with pore connectivity and uniform distribution obtained by powder sintering are not very good, the main reasons are how to arrange the support and elimination of porous media in the process, and the collapse of metal powder sintering process. However, there is no good solution in the known literature reports, leaving nature alone.
There are few literature reports on the fabrication of porous tantalum by metal powder sintering, especially for the purpose of obtaining medical implant materials. For reference, the public number is CN200510032174, named "Three-dimensional through-hole or partial-hole interconnecting porous metal foam and its preparation method", and CN200710152394, named "A new porous tungsten foam and its preparation method". However, the porous metal obtained is either used as a filter material, or used in aerospace and other high-temperature applications rather than as a medical metal implant material, and the porous metal processed is not porous tantalum.
