The 3D printing manufacturing method and application of tantalum belong to the field of additive manufacturing technology. A 3D printing manufacturing method for the metal tantalum, including: The spherical tantalum powder was loaded into the 3D printing forming equipment, argon gas was used to purge the 3D printing forming equipment until the oxygen content in the 3D printing forming equipment was less than 100ppm, and the TC4 titanium alloy substrate was preheated under the condition of 90 ~ 150℃. The Angle between the scanning layers was 67°, and 3D printing manufacturing was carried out. The raw tantalum powder used in the manufacturing method is spherical, high purity, low oxygen content and excellent flow performance. The surface roughness of the metal tantalum prepared by 3D printing is Ra≤5.0μm, the density ρ≥ 99.8%, the tensile strength σb = 697MPa, the yield strength σ0.2 = 581MPa, and the elongation δ = 27.5%. It can meet the performance requirements of ISO13782 surgical implants used in the biomedical field.
Orthopedic implant metal materials in the biomedical field mainly include stainless steel, cobalt-chromium alloy and titanium and titanium alloys. The stainless steel first used in clinic will cause frictional corrosion under the action of physiological environment, resulting in the loosening of the implant and failure. Although cobalt-chromium alloy and titanium alloy have excellent corrosion resistance, they will slowly release toxic elements or chromium, vanadium, aluminum and other elements that can cause neurological disorders and osteomalacia during service, and there are problems such as "stress shielding", which restricts the clinical development and application prospects of the materials. Tantalum has outstanding biocompatibility, low elastic modulus, high friction coefficient, excellent tissue endogeneity and cartilage conductivity, high strength, strong corrosion resistance, etc. It is an ideal substitute material for human bone.
However, due to the high melting point of tantalum, it is difficult to be formed by conventional processing methods, and the price is expensive, so its application in biomedicine and other fields is limited to a large extent. At present, there are few reports on exploratory research on the 3D printing process of tantalum metal, and using chemical tantalum powder such as hydrogenation dehydrogenation and sodium reduction as raw materials, 3D printing tantalum metal has problems such as low density, tensile strength, yield strength, elongation and other comprehensive mechanical problems. Therefore, the development of a high-performance metal tantalum 3D printing manufacturing method is of great significance. Aiming at the shortcomings of the prior art, the invention aims to provide a 3D printing manufacturing method for tantalum metal. The tantalum metal obtained by the method has good performance, high tensile strength, yield strength and elongation, and can meet the performance index requirements of ISO 13782 surgical implants used in the biomedical field.
