EFFECT OF NI ADDITION ON MECHANICAL AND CATALYTIC PROPERTIES OF TIAL ALLOY

• Main Author: HARDIAN TAUFIQURRAHMAN NIM : 10514060, MUHAMMAD
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29216
• Institution: Institut Teknologi Bandung

TiAl alloys have several potential <br /> <br /> applications <br /> <br /> , as <br /> <br /> an <br /> <br /> alternative raw material components in <br /> <br /> turbine engines <br /> <br /> or as <br /> <br /> catalysts for the synthesis reaction of organic compounds. However, TiAl <br /> <br /> alloys as a raw material of turbine <br /> <br /> engine components have a d <br /> <br /> rawback, <br /> <br /> i.e. <br /> <br /> low ductility at <br /> <br /> room temperature and low creep resistance at high temperatures. In this final <br /> <br /> project, <br /> <br /> TiAl <br /> <br /> alloys <br /> <br /> with <br /> <br /> Ni <br /> <br /> addition have been synthesized <br /> <br /> by mechanical alloying method. <br /> <br /> M <br /> <br /> echanical <br /> <br /> properties <br /> <br /> like <br /> <br /> har <br /> <br /> dness <br /> <br /> is expected increases with t <br /> <br /> he addition o <br /> <br /> f Ni to the TiAl alloys <br /> <br /> . The <br /> <br /> synthesis of TiAl alloys is done by varying the <br /> <br /> milling <br /> <br /> time (5, 15, 30 and 50 hour <br /> <br /> s), sintering <br /> <br /> temperature (500 <br /> <br /> (rumus) <br /> <br /> C, 700 <br /> <br /> (rumus) <br /> <br /> C <br /> <br /> and 900 <br /> <br /> (rumus) <br /> <br /> C) and sintering time (2, 4 and 6 hours). <br /> <br /> T <br /> <br /> he <br /> <br /> best <br /> <br /> condition <br /> <br /> wa <br /> <br /> s obtained <br /> <br /> for <br /> <br /> 50 ho <br /> <br /> urs <br /> <br /> of <br /> <br /> milling <br /> <br /> time <br /> <br /> , 900 <br /> <br /> (rumus) <br /> <br /> C <br /> <br /> of sintering temperature <br /> <br /> and 6 <br /> <br /> hours <br /> <br /> of <br /> <br /> sintering time. Addition of Ni (3, 6 and 9%) was performed after the best condition <br /> <br /> (50 <br /> <br /> hours, 900 <br /> <br /> (rumus) <br /> <br /> C for 6 hours) at the time of TiAl alloy synthesis <br /> <br /> is achieved <br /> <br /> . <br /> <br /> C <br /> <br /> haracteriz <br /> <br /> ation of <br /> <br /> the structure and morphology of alloys were carried out by <br /> <br /> PXRD and SEM <br /> <br /> - <br /> <br /> EDS <br /> <br /> analysis <br /> <br /> techniques <br /> <br /> , <br /> <br /> then <br /> <br /> hardness test <br /> <br /> using micro Vickers method <br /> <br /> and catalytic activity test <br /> <br /> were <br /> <br /> applied on alloys <br /> <br /> . PXRD <br /> <br /> results of <br /> <br /> TiAl and Ti <br /> <br /> AlNi alloys <br /> <br /> showed <br /> <br /> the highest peak appears at <br /> <br /> 2&#952; = <br /> <br /> 39 <br /> <br /> (rumus) <br /> <br /> and 2&#952; = 43,86 <br /> <br /> (rumus) <br /> <br /> which are appropiate with <br /> <br /> reference <br /> <br /> of alloys. The images <br /> <br /> of SEM <br /> <br /> - <br /> <br /> EDS show <br /> <br /> ed <br /> <br /> that <br /> <br /> TiAl and TiAlNi <br /> <br /> alloys <br /> <br /> have been formed <br /> <br /> with granule <br /> <br /> - <br /> <br /> like shape <br /> <br /> . Hardness <br /> <br /> testing for TiAlNi <br /> <br /> alloy <br /> <br /> showed significant <br /> <br /> increases in the value of hardness <br /> <br /> , <br /> <br /> from 194 HV to <br /> <br /> 440 HV for the addition of 9% Ni. The addition of Ni to TiAl alloys also causes increased <br /> <br /> catalytic properties <br /> <br /> , <br /> <br /> especially for <br /> <br /> reaction of benzaldehyde acetalization with <br /> <br /> metanol. <br /> <br /> For the <br /> <br /> reaction at <br /> <br /> room <br /> <br /> temperature for 1 hour <br /> <br /> , <br /> <br /> b <br /> <br /> enzaldehyde <br /> <br /> was <br /> <br /> converted to acetal products <br /> <br /> by TiAl <br /> <br /> and TiAlNi alloy <br /> <br /> s <br /> <br /> with <br /> <br /> efficiencies of <br /> <br /> 36% and 67% <br /> <br /> , <br /> <br /> respectivel <br /> <br /> y