Ni-Al and NiO-Al Composite Coatings by Combustion-Assisted Flame Spraying

Coatings

Galina Xanthopoulou²  Amalia Marinou²  George Vekinis²  Aggeliki Lekatou¹ 

[1] Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece; E-Mail:;Institute of Advanced Materials PPNM, NCSR “Demokritos”, Athens 15310, Greece; E-Mails:

关键词: combustion-assisted flame spraying (CAFSY);    combustion synthesis;    flame spraying;    intermetallic phases;   

DOI  :  10.3390/coatings4020231

来源: mdpi

【 摘 要 】

A new, cost-efficient and on-site-applicable thermal spraying process for depositing NiAl metallic overlay or bond-coat coatings for high temperature applications by synthesizing the desired intermetallic phases in-flight during oxy-acetylene flame spraying is presented. Base-metal powders were used for spraying and, by adjusting the spraying conditions, excellent NiAl-based coatings were achieved on various substrates, including mild steel, stainless steel and aluminium alloys. Expensive, pre-alloyed or agglomerated powders are avoided and the method is very promising for in-situ work and repairs. We call the new method “Combustion-Assisted Flame Spraying” (CAFSY) and its viability has been demonstrated at a pre-industrial level for coating metallic substrates. The NiAl-based coatings produced by CAFSY exhibit very high integrity with good adhesion, very low porosity, high surface hardness and high erosion resistance at a substantially lower cost than equivalent coatings using pre-prepared alloy powders.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.