Al-Cu-Fe-B quasicrystalline and Mo coatings were obtained on the mild steel and brass
substrates by thermal spraying routes for the purpose of replacement of Mo coatings with
quasicrystalline ones. Quasicrystalline coatings were prepared by air plasma spraying and/or HVOF
(High Velocity Oxygen Fuel) techniques followed by subsequent heat treatment, and Mo coatings,
wire flame spraying. For comparative studies of important properties for industrial application,
mechanical properties, bonding strength, surface energy, and tribological behavior were investigated
based on microstructural characterization. Basic mechanical properties such as hardness, fracture
toughness, and elastic modulus of quasicrystalline coating showed comparable values with those of
Mo coatings. De-bonding tests of coatings deposited onto brass substrate indicated that the bonding
strength of quasicrystalline coatings obtained by HVOF techniques exhibit higher value to Mo
coatings. Non-sticking property analogized from surface energy calculation and friction coefficient of
quasicrystalline coatings also showed better performance during the tests. It is suggested from this
investigation that the quasicrystalline coating can be effectively used as a replacement of the Mo
coating, which has shown a recent steep price rise and problems of accidental existence of minor
environment harmful elements such as Cr6+, Pb, Cd, and Hg.
Properties of Journal Bearing Materials That Determine Their Wear Resistance on the Example of Aluminum-Based Alloys
