Effects of Milling Time and 0.1% Y2O3 Additions on Sandvik Sanergy High Temperature (SSHT) Qolby Sabrina*, Nurhalis Majid , Ahmad Afandi
Research Centre for Physics, Indonesian Institute of Sciences, Kawasan Puspiptek Serpong Tangerang Selatan, 15314, Banten INDONESIA
Abstract
Improving oxidation resistance and enhancing mechanical properties of interconnect materials for Solid Oxide Fuel Cell (SOFC) has been becoming major investigation recently. One special material developed for interconnect is sandvik sanergy high temperature (SSHT) which contains major elements of Fe, Cr, Ti, Ni, Mn. To improve oxidation resistance 0.1% of Y2O3 was added, and finally mechanical alloying was performed to refine the grain size. It has been well accepted that the finer grains will improve mechanical properties of materials, thus high energy milling (HEM) was employed with different time milling from 4, 8, and 16 hr. HEM was set 30 Hz constant, using ball milling, and the vial made of alumina with constant ball to powder ratio of 10:1. The pure SSHT powder, and the milled powders were further analysis with X-Ray Diffraction, Rigaku Smartlab operated at 30 mA, and 40 kV, using 0.02o step, and scanning speed of 4o/min. The line profile analysis was conducted to analyze the evolution of lattice parameters, micro strains, and crystallite size using Williamson-Halls and Scherer method. The microstructure morphology of milled SSHT was analyzed using Scanning Electron Microscopy (SEM) Hitachi SU3500. The particle size of the milled SSHT was further investigated using imageJ software, the result was compared and discussed with crystallite size measured by XRD.
Keywords: SSHT, Yttria, YTiO3, crystal size, lattice strain, morphology material
