Characterization and Wear Behavior of Heat-treated Ni3Al Coatings Deposited by Air Plasma Spraying

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• 作者：K. Mehmood ; M. A. Rafiq ; A. Nusair Khan…
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：25
• 期：7
• 页码：2752-2760
• 全文大小：4,387 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024
• 卷排序：25

文摘

Air plasma spraying was utilized to deposit Ni₃Al coatings on AISI-321 steel substrate. The deposited coatings were isothermally heat-treated at various temperatures from 500 to 800 °C for 10, 30, 60, and 100 h. The x-ray diffraction analysis revealed NiO formation in Ni₃Al at 500 °C after 100 h, and the percentage of NiO increased with increasing exposure time and temperature. The hardness of the coating increased with the formation of NiO. The DSC test showed the formation of minor phases, Al₃Ni and Al₃Ni₂, within the coating along with the major phase N_i3Al. TGA revealed a slowing down of the oxidation rate upon surface oxide formation. The pin-on-disk wear test on the as-sprayed and heat-treated coatings showed that wear rate and coefficient of friction decreased with an increase in the NiO phase content.Keywordsair plasma sprayingcharacterizationisothermal treatmentnickel aluminidewear behavior