Study of The Effect of Alumina Addition to Cyclic Oxidation Resistance and Intermetallic Thermal Shock of NiAl from Planetary Ball Milling

• Main Author: KHARISMA PEGA (NIM: 13714001), SULTHAN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31136
• Institution: Institut Teknologi Bandung

<p align="justify"> NiAl intermetallic is an alternative material for high temperature working environment. It has become a favorable material for coating because it is highly resistant to high oxidation. Cyclic oxidation resistance and thermal shock of NiAl is further investigated for its relationship with doping addition. Three types of Ni-50 at% Al are made: without doping, with 0.1 at% Al2O3, and 0.3 at% Al2O3. NiAl is made by using powder metallurgy method by using Planetary Ball Milling. Mixed powder generated from mechanical alloy is characterized by using XRD to examine the NiAl content in it. Cyclic oxidation is performed at temperature of 1200 oC for 1 hour and then cooled down at ambient temperature for 30 minutes. Porosity test is done to determine the porosity in NiAl sinter product and thermal shock. Based on the test results, cyclic oxidation resistance of NiAl+0,1 at% Al2O3 can form stable passive layer at the fastest rate. Meanwhile, the NiAl+0,3 at% Al2O3 one can generate the thickest layer. Thermal shock test results suggest that all compositions have equal resistance. It is observed that NiAl intermetallic cyclic oxidation resistance with powder metallurgy method is determined by doping composition and generated oxide layer because they affect the generation rate of the oxide layer. <br /> <p align="justify">