Abstract
Abstract Quality control of laser additive manufactured medical implants is of interest, especially if nondestructive quality control can be performed on parts before implantation. X-ray micro-computed tomography (microCT or CT) can be used for defect/porosity analysis as well as for comparing the part surface with its computer-aided design (CAD) file. In both cases, the limited use of CT is partly due to the variation in scan types and the quality of scans that can occur. We present a simple method demonstrating the use of a light metal casting as a reference porosity sample, to confirm good CT image quality and to quantify minimum detectable pore size for the selected CT scan settings. This makes a good comparison for additive manufactured parts, since castings generally contain more porosity. A full part-to-CAD comparison shows how the part is compared with its CAD file, as a second-quality control. The accuracy of the CAD variance is given by the minimum detectable pore size. Finally, the part is sect...
Highlights
Additive manufacturing is a technology that allows the direct production of complex geometry parts, with time and cost advantages for the manufacture of custom-designed individual products such as custom medical implants
Quality control of laser additive manufactured medical implants is of interest, especially if nondestructive quality control can be performed on parts before implantation
We present a simple method demonstrating the use of a light metal casting as a reference porosity sample, to confirm good computed tomography (CT) image quality and to quantify minimum detectable pore size for the selected CT scan settings
Summary
Additive manufacturing is a technology that allows the direct production of complex geometry parts, with time and cost advantages for the manufacture of custom-designed individual products such as custom medical implants. Additive manufacturing of metals is possible through the use of both electron beam melting and laser melting.[1,2,3]. Quality control in metal additive manufacturing is extremely important, both for dimensional accuracy and for minimizing or eliminating defects. High-quality parts are especially required in additive manufacturing for aerospace parts,[8] automotive engine parts,[9] and medical implants.[10]
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