| Abstrakt: |
Nowadays, SLM-technology has found application in various fields, including dental. The manufacture of dental implants by SLM has significant advantages. The aim of the work was the development and manufacture of equipment, practicing printing conditions by SLM technology and electrochemical polishing of dental implants with Ti-6Al-4V. The titanium Ti-6Al-4V alloy of the chemical composition, wt.%: 6.21 Al; 4.03 V; 0.04 Fe; 0.1 C; 0.7 O; 0.02 N; Ti - base, was used. The source material was examined using a scanning electron microscope REM-106 and microstructure was examined by CarlZeiss AxioVert 200M mat. The mass control was performed by the analytical scales ADV-2000. Electrochemical polishing was performed in a solution of hydrofluoric acid (HF), nitric acid (HNO3) with glycerol (C3H8O3). The ultra-compact 3D printer Alfa-150D with a working field size of 150×150×180 mm was designed and manufactured. The printer is equipped with a high-precision ytterbium laser with air cooling of 200 W power. The positioning accuracy of the laser beam is 0.15 μm. The thickness of the working layer is 20‒100 μm. The samples of implants from Ti-6Al-4V were made according to experimental technological conditions: constant laser power -- 195 W, laser beam scanning speed -- 1000‒1200 mm/s with a step of 50 mm/s, distance between beam passes -- 0.09-0.12 mm with a step of 0.01 mm at a constant scanning speed. The set conditions: laser power -- 195 W, scanning speed -- 1000 mm/s and distance between tracks -- 0.12 mm provide the density of metal samples of more than 99.99 %. On the implants manufactured according to the recommended conditions, the effect of current (0.5‒2.5 A), voltage (12‒20 V) and duration (3‒6 min) on mass loss during electrochemical polishing was investigated. Rational conditions of posttreatment were established with the use of visual analysis. Rational conditions (current -- 2 A, voltage -- 17 V) of electrochemical polishing of dental implants for reduction of roughness and during maintenance of accuracy of geometry in the field of a thread were established. The dependence of mass loss of dental implants during electrochemical polishing depending on the duration of treatment was established. [ABSTRACT FROM AUTHOR] |
