EFFECT OF COMPOSITION 1, 3, AND 5 WT% COPPER ON THE PORES, MICROSTRUCTURE, AND HARDNESS AS A PRODUCT OF TITANIUM AND COPPER SINTERED ALLOY BY COLD-PRESS AND HOT-PRESS

• Main Author: Adi Pamungkas, Rizki
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40237
• Institution: Institut Teknologi Bandung

Titanium as an implant alloy has good biocompatibility, corrosion resistance, and low modulus of elasticity. Adding of copper into the alloy will give antibacterial ability also increase strength and hardness. Powder metallurgy as one of the methods to produce an implant always produces a porous product. Those pores will decrease mechanical properties and become a stress concentrator. Combining compaction and sintering in one step at a high temperature can produce pores as few as possible. However, that method needs high cost and high-temperature resistance dies material. To overcome the problem mentioned, doing hot-pressing and sintering separately, in two stages will be an alternative. In this research Ti-Cu sinter alloy with 1,3 and 5 wt% of copper was used. Titanium and copper powder were milled using Planetary Ball-mill with duration of three hours. Then the powder was pressed, using hot-press (500ºC) and cold-press method with compaction pressure of 100 bar, followed by 2 hours of sintering at 950°C. The pressed and sintered sample's pores was observed using an optikal microscope. Meanwhile, the hot-pressed and sintered sample were observed using an optikal microscope and SEM for microstructure observation, Energy Dispersive Spectrometer (EDS) and X-Ray Mapping test to get elements composition, and hardness test using Vickers Hardness Tester. The results show that cold-press sintered and hot-press sintered Ti-Cu alloy have ?- Ti, lamellar ?-Ti-Ti2Cu with Ti2Cu precipitate, and ?-Ti with Ti2Cu precipitate. Area percent pores will decrease as copper wt% increasing but pores diameter will be increasing. It is proved that hot-press method can produces Ti-Cu alloy with pores area percent (2,44-2,59%) smaller than cold-press method (9,47-13,87%). Grain size will decrease as copper wt% increasing. Ti-Cu alloy’s hardness will increase as copper wt% increasing. Hot-press method can produces Ti-Cu alloy with hardness (516,7-620,8 HV) higher than cold-press method hardness (273,2- 331,7 HV).