Research Of Using 3D Printing And Sintering Reinforcement Technology To Process Artificial Bones Based On Hydroxyapatite

Qualified artificial bones should have good mechanical properties and connecting micro-hole structures that are similar to human bones. Using the traditional processing methods, such as turning, milling, grinding, forging and die casting, it is difficult to work out the micro-hole structures inside. Besides, processing complicated shapes of artificial bones often takes a long time, and it needs to be further post-processed.3D printing technology can guarantee accurate topological relations and internal micro-hole structures under computer systems control, work out any shapes of artificial bones, and control the distribution of the micro-holes, and can provide growth space and channels for cells, blood vessels to speed up the process of bone repair.This paper combines 3D printing technology with artificial bones processing, eventually puts forward a processing scheme for artificial bones by using a new type of 3D printer.In the design process of the new project, some theoretical analyses were made on important aspects, such as: 3D printing technology compared with traditional machining methods, advantages and disadvantages of different kinds of 3D printing technology for artificial bones processing, ceramic sintering methods, the system compositions and performance requirements of the new 3D printer, the choice of ceramic substrate materials, binder, pore-forming agent, and reinforcing materials, etc.On the basis of ordinary 3D printers, some improvements were made, such as the structure design of workbench transmission in Z direction, multi-nozzle structure for different kinds of materials, process flow chart, system compositions, performance requirements, etc.In the second part, this paper theoretically studied the sintering characteristics of hydroxyapatite, chose microwave sintering methods. The suitable ceramic composition was determined by the experiments: mixing the different proportions of pore-forming agent, reinforcing materials with the hydroxyapatite powder, studying material compositions on the ceramics mechanical properties, and eventually determining suitable material proportions.