3D printing mold making self-propagating thermal explosion forming porous NiTi artificial implant technique

Abstract

The invention provides a 3D printing mold making self-propagating thermal explosion forming porous NiTi artificial implant technological method. The method comprises the following technological steps that 1, a plastic model is printed, specifically, scanning is conducted through a CT machine so that a human body CT image file can be obtained, a 3D file of the printing model is designed through part of a bone joint digital 3D file compounded and intercepted by mimics10.0 software, and a polyethylene model of an artificial joint is printed through a 3D printer; 2, duplication of a thermal explosion forming mold is conducted, specifically, the printed plastic model is used for duplicating the self-propagating thermal explosion forming mold, and cement and light refractory brick powder are used for duplicating the porous NiTi alloy thermal explosion mold; and 3, a porous NiTi alloy artificial implant is formed, specifically, Ni powder and Ti powder are mixed evenly and pressed through a press machine according to the approximate equi-atomic ratio, a green body is formed, the green body is placed into the thermal explosion mold, then the green body and the thermal explosion mold are placed into a resistance furnace together, the temperature is increased to the NiTi self-propagating reaction temperature under the argon protection, a self-propagating reaction is conducted on the whole green body simultaneously, and the thermal explosion forming porous NiTi artificial implant is formed.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of digital additive manufacturing and self-propagating technology, and relates to a 3D printing molding self-propagating thermal explosion forming porous NiTi artificial implant process. Background technique [0002] Porous NiTi alloys, due to their good porosity, can allow the growth of human tissues inside them, as well as the delivery of liquid nutrients. In addition, its good deformability and shape recovery ability enable it to coordinate with other tissues of the human body. In addition, it has the elastic modulus closest to human bone among medical implant metal materials, good corrosion resistance and biocompatibility. Considered a promising biomedical material. Can be used for bone grafting. Traditional porous NiTi alloy implants are usually manufactured by powder metallurgy, that is, the prepared nickel powder and titanium powder are mixed uniformly, compacted in a universal mo...

AI Technical Summary

Problems solved by technology

However, porous NiTi alloys with precise dimensions and good connectivity are difficult to form directly by 3D printing.

The reason is that the mixed powder of Ni powder and Ti powder or the core wire material with an atomic ratio close to 1, when the printing temperature exceeds its ignition temperature, a self-propagating reaction will occur, which is prone to problems such as "tempering", oxidation, and burning of the print head.