The invention relates to a preparation method of medical porous titanium or titanium alloy material coated with tantalum coating. The method firstly adopts 3D printing method to prepare porous titanium skeleton or titanium alloy skeleton, then corrodes the porous titanium skeleton or titanium alloy skeleton, cleans and dries it, and then completely covers it in ultra-fine tantalum powder inside the metal envelope, seals it by vacuum, and then performs low-temperature diffusion sintering. Finally, the powder is removed and the medical porous titanium or titanium alloy coated with tantalum coating is obtained. By powder embedding and low temperature diffusion sintering, tantalum is coated on the surface of porous titanium skeleton or porous titanium alloy skeleton and forms metallurgical bonding, which greatly improves the bonding force between tantalum and porous titanium skeleton or porous titanium alloy skeleton surface, solves the problem of poor bonding force between tantalum coating and matrix, and overcomes the disadvantages of high cost and complex process of the existing preparation method.
Tantalum is known to be an ideal biomedical material, and numerous studies have demonstrated the unique advantages of tantalum as a powder for orthopedic implants in terms of biocompatibility, mechanical properties, surface friction coefficient, and bone-inducing properties. However, due to the high melting point and high affinity with oxygen, complex manufacturing processes and high manufacturing costs, tantalum and porous tantalum have greatly limited the scale application of orthopedic implants.
At present, tantalum coating preparation technology mainly includes: chemical meteorological deposition, magnetron sputtering, plasma spraying and other technologies. However, the tantalum coating prepared by the existing method does not produce metallurgical bonding with the metal matrix, and the coating is easy to fall off during the use of the implant, and the resulting coating debris will cause joint wear and inflammation, resulting in implant failure, aggravating patients' pain and medical costs. In addition, magnetron sputtering, plasma spraying and other physical vapor deposition technologies such as thermal spraying can only prepare the coating on the surface of dense titanium alloys, and can not achieve uniform and stable preparation of the coating inside the porous structure. Although chemical vapor deposition technology can achieve the preparation of porous structure internal coating, the technology has high equipment cost, low deposition efficiency and poor process stability.
Aiming at the shortcomings of the prior art, a preparation method of medical porous titanium or titanium alloy material coated with tantalum coating is provided. By powder embedding and low-temperature diffusion sintering, tantalum is coated on the surface of porous titanium skeleton or porous titanium alloy skeleton to form metallurgical bonding, which greatly improves the bonding force between tantalum and porous titanium skeleton or porous titanium alloy skeleton surface, solves the problem of poor bonding force between tantalum coating and matrix, and overcomes the shortcomings of existing preparation methods, such as high cost and complicated process.
