Based On The Rpm-cvi Carbon / Carbon Composite Artificial Bone Forming Technology

Carbon/carbon composites have good biocompatibility and mechanical compatibility. It has better intensity and toughness than carbon material, is a kind of potential new-type biomaterial, so it has very expansive application prospect in bones repair and substitute field. But because the form of the artificial bones is very complicated, it is difficult to adopt the traditional method for carbon/carbons composites. Moreover the preparing period is very long, and the cost is very high. How to prepare out the artificial bones with complicated form within shorter time and keep its capability, which is an urgent problem to be solved to develop and apply carbon/carbon composites artificial bones.The rapid prototype manufacturing (RPM) technology can produce the prototype and corresponding mould fast, and shorten the producing and developing period of the products. Aim at artificial bones with forms the complicated, RPM-CVI compound molding technology were brought forward by combining the rapid prototype technologies of advanced manufacturing field with CVI technology using by most extensive at carbon/carbon composites together, and make molding process of artificial bones.Three-dimensional model of the patient's bones and joint can be rebuilt by utilizing CT data on the computer, artificial thighbone matching with patient's joint was designed out, and transform CAD model into STL files.Plaster and silicon rubber based on indirect RP technology were compared and analyzed by characteristic to make mould. Brushing method and pouring method were used to make the artificial bones silicon rubber mould separately.Through the research of mechanism of infiltration, the influences factors of infusing to the course of molding of carbon/carbon composite preform were analyzed. By controlling molding temperatures and pressure, carbon/carbon composites artificial thighbone was produced in mould.The influence of technology parameter of carbonization and CVI to the course of molding was discussed. CVI experiment indicated that temperature and reaction gas density has an effect on the result of perform densification. In order to get relatively compact carbon/carbon artificial bones within shorter time, deposit temperature and reaction gas density should be chose rationally.RPM-CVI compound molding technology primary solved the bottleneck problem from research to application that carbon/carbon composite use at artificial bones. The research laid a foundation for the development of biomedicine domain.