The invention belongs to the field of additive manufacturing technology and provides a method for 3D printing porous tantalum post-treatment and high temperature vacuum sintering to reduce oxygen content. Specifically: Remove the 3D printed tantalum products from the substrate, remove the excess tantalum powder adhering to the 3D printed tantalum products, after drying, put the tantalum products into the high-temperature vacuum sintering treatment vacuum furnace for multi-stage temperature warming - heat preservation of high temperature vacuum sintering process, specifically, the first temperature rise to 1500 ~ 2600℃, heat preservation 5 ~ 450min, The number of sections of the temperature ‑ insulation is 1 to any number of sections, and the temperature of each section is different. After the temperature ‑ insulation heat treatment, the power is cut off to cool down to less than 50 ° C, and then the vacuum is stopped, and the 3D printed porous tantalum implant is removed. The invention creatively uses the high temperature vacuum sintering treatment method to reduce the oxygen content in the laser 3D printing tantalum products, so that it can reach 300ppm or even 100ppm below, thus reducing the requirement of oxygen content of raw material 3D printing tantalum powder, and greatly reducing the cost of 3D printing raw materials and products.
In the industry, vacuum heat treatment at 1000 ~ 1200℃ is usually used to eliminate the stress of tantalum products, and in the vacuum heat treatment process, the oxygen content of tantalum metal products will be increased. At the same time, laser 3D printing is carried out in an argon environment, because the argon environment inevitably contains oxygen (usually 1000ppm), tantalum is a metal that is easily oxidized at high temperatures, so even if the oxygen content of 3D printing tantalum powder raw materials is less than 300ppm, the oxygen content of the printed products will increase. It is quite difficult to achieve the oxygen content of medical tantalum metal products of 300ppm. To this end, many people pursue to control and reduce the oxygen content of tantalum powder for laser printing raw materials to below 200ppm, which makes it more difficult to produce tantalum powder for laser printing raw materials, and the production efficiency of tantalum powder products is very low, and the cost has risen significantly.
The invention relates to a method for 3D printing tantalum metal post-treatment and high temperature vacuum sintering to reduce oxygen content. The method uses ultra-high temperature thermal treatment to reduce the oxygen content of 3D printed products, so that it can reach 300ppm or even 100ppm below, thus reducing the requirement for the oxygen content of raw materials 3D printed tantalum powder and greatly reducing the cost of 3D printing raw materials and products.
