EFFECT OF HOLDING TIME AND COMPRESSIVE LOADS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TITANIUM COPPER ALLOYS USING SPARK PLASMA SINTERING (SPS)METHOD

• Main Author: Fitri, Anisa
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66138
• Institution: Institut Teknologi Bandung

Ti-Cu alloy as a bone implant material has many advantages such as biocompatibility and good corrosion resistance, low modulus elasticity, antibacterial properties and high strength and hardness. One of the implant blending methods is by powder metallurgy. However, this method still produces a high percent of the pore area. The presence of these pores can reduce mechanical strength and become a stress concentrator. Mixing Ti-5Cu through mechanical alloying (MA) follow by spark plasma sintering (SPS) method is a way to reduce pores because this process wiould produce a homogeneous and fine powder and to deform the powder at high temperaturs so it would produce an excellent mechanical interlocking and a more compact particles. A series of experiments would be carried out to obtain the influence of the holding time variations (5, 10 and 15 minutes) and pressure variations (40, 50, and 60 MPa) on the microstructure and strength of Ti-5Cu alloys. Ti-5Cu powder with an average size of 44 ?m was mixed by mechanical alloying for 2 hour. After that, the sintering process was carried out at a temperatur of 750°C with variations in pressure and holding time with a heating rate of 50°C/minute under vacuum until the pressure was below 5 Pa. Then the sample was prepared for microstructural observations using optical microscope and SEM-EDS and compressive test using the Universal Testing Machine. Micro-observation results show that the Ti-5Cu alloy sintered at a temperature of 750°C will appear ?-Ti and Ti2Cu phases. These two Phases have a larger and lower size with the holding time increases. In general, increasing the compressive load used would result in greater relative density and higher strength. Ti-5Cu alloy, which was subjected a compressive load of 60 MPa with a holding time of 5 minutes have the highest compressive strength of 1800 MPa and relatively lower porosity compared to alloys with other variations.