EFFECT OF TITANIUM ADDITION IN ZR-7AG ALLOYS ON MECHANICAL PROPERTIES, ANTIBACTERIAL ACTIVITY, AND CORROSION BEHAVIOR AT SIMULATED BODY FLUID RINGER LACTATE MEDIA

• Main Author: Rahmawan Widiarto, Hilda
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62135
• Institution: Institut Teknologi Bandung

The high annual demand for bioimplants has generated the development of research on materials for bioimplants exponentially. Metals, ceramics, polymers and composites are common materials used in bioimplants manufacturing nowadays. Among these materials, metals are most widely used due to their mechanical strength, easy fabrication, and good biocompatibility. Zirconium alloys are metallic bioimplant which has good mechanical strength, superior corrossion resistance, and excellent biocompatibility. To create new superior zirconium alloys, Zr-7Ag-xTi alloys (x=0,1,2) was developed and investigated in this study. This study aims to determine the effect of titanium addition to the microstructure, mechanical properties, antibacterial activity, and corrosion behavior of Zr-7Ag alloys. This study comprises the manufacture of alloys up to hardness, antibacterial, and corrosion testing. First of all, the raw materials were melted and shaped into buttons using a DC arc melting furnace, then homogenized at 1000 ?C for six hours. After that, the button cut into four specimens for microstructure observation and some tests. The first specimen used for OM microstructure observation and XRD testing. The second specimen used for SEM and X-Ray Mapping observations. The third specimen was used for Vickers Hardness testing and antibacterial testing using beef-broth diffusion plate method. The last specimen was used for corrosion testing using potentiodynamic polarization method in Ringer Lactate media. The addition of titanium in Zr-7Ag alloys cause the formation of Zr2Ag intermetallic. Beside that, the addition of titanium will reduce the crystal size of the alloys. The addition of 1% wt titanium reduced crystallite size by 21% and 2% wt by 29% from the initial size. The addition of titanium will increase the hardness of the Zr-7Ag alloys. The hardness value of Zr-7Ag is 606.78 HV, Zr-7Ag-1Ti alloy had 669.2973 HV increased 10% from the initial state and Zr-7Ag-2Ti alloy had 689.5269 HV increased 13%. The corrosion rate of Zr-7Ag alloy decreases with increasing titanium content. Zr-7Ag alloy has a corrosion rate of 2.224 mpy, Zr- 7Ag-1Ti alloy is 0.05164 mpy, and Zr-7Ag-2Ti alloy is 0.042 mpy. The addition of titanium also decreased the antibacterial properties of the Zr-7Ag alloy. The Zr- 7Ag-1Ti alloy and Zr-7Ag-2Ti alloy didn’t exhibit any inhibition zones as Zr-7Ag alloy in the test using the diffusion plate method.