On the SLM and EBM of Ti-6Al-4V ELI alloy for advanced knee arthroplasty

audiovizuální tvorba

angličtina

Research and development of a novel implant knee design and insertion technology, preservation of original healthy bone, light mass of the implant, prolongation of time for re-operation. Optimisation of technological routines for production of samples made from Ti6Al4V ELI powder suitable for knee implant production, testing of dimensional accuracy, quality, mechanical and fatigue properties, production of implant prototypes. Selective Laser Melting (SLM) and Electron Beam Melting (EBM) of the Ti6Al4V ELI alloy, advanced machining, analytical electron microscopy, mechanical, tribological and fatigue testing were used as principal techniques. Two series of solid cylindrical specimens (diameter 14mm, length 120mm; 24 bits) were made for the standard mechanical testing. Several samples of knee implants have been made and tested also. Both additive technologies proved to be competitive for the knee implant production. The EBM technology allowed a production of very fine structured materials with a low porosity (<0.1%), high mechanical properties of Ti6Al4V (tensile strength more than 1,000 MPa, elongation more than 12%), tumbled glossy surface (Ra<0.03) m, and better fatigue resistance (tension/thrust mode). A statistically significant low coefficient of friction on high molecular polyethylene (p<0.01) compared to the standard polishing was found due to smooth surface topography of samples. The novel design of the knee implant, digital technologies, EBM technology and surface post-processing of Ti6Al4V, allow to reduce the weight of the novel type of the distal femur implant (> 60%) with a higher preservation of the original bone. The EBM samples showed a better combination of tensile strengths, plasticity and fatigue resistance.

SLM; EBM; Ti-6Al-4V ELI; knee; arthroplasty

PÍŠKA, M.; BUČKOVÁ, K.

4. 9. 2019

British Orthopaedics Research Society

Cardiff

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