Open AccessEffect of Heat Exposure on Grain Growth and Oxidation Behavior of Cobalt Based Composite Powders by Facile Suspension Synthesis
Author(s) -
N. F. Kadir,
Abreeza Manap,
Meenaloshini Satgunam,
Nurfanizan Afandi,
Savisha Mahalingam,
Salmi Mohd Yunus
Publication year - 2019
Publication title -
international journal of recent technology and engineering
Language(s) - English
Resource type - Journals
ISSN - 2277-3878
DOI - 10.35940/ijrte.d5137.118419
Subject(s) - materials science , nial , intermetallic , composite number , scanning electron microscope , suspension (topology) , grain growth , particle (ecology) , grain size , cobalt , composite material , particle size , chemical engineering , metallurgy , oceanography , mathematics , alloy , homotopy , pure mathematics , engineering , geology
In this study the intermetallic-matrix composite powders CoNiCrAlY-2wt. %Al2O3 were characterized in order to investigate the effect of heat exposure time on morphologies, grain growth and phases formed by facile suspension route synthesis. The as-synthesized powders were examined by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and X-ray diffraction (XRD). The formation of NiAl phase was noticed after 1 hour of heat treatment. The average particle size of intermetallic-matrix composite powders CoNiCrAlY-2wt.%Al2O3 increased as the heat exposure time increased. It is found that the reinforcement of alumina allowed the particles to uniformly distributed when the sample was heated for 10 hours. The formation of NiAl started when the sample was heated at 1 hour and NiAl continued to form when heated at 10 hours.