FeAI and Mo-Si-B Intermetallic Coatings Prepared by Thermal Spraying

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Intermetallics

DOI:https://doi.org/10.1016/j.intermet.2004.04.034· OSTI ID:912193

Totemeier, Terry C; Wright, Richard N; Swank, W David

FeAl and Mo–Si–B intermetallic coatings for elevated temperature environmental resistance were prepared using high-velocity oxy-fuel (HVOF) and air plasma spray (APS) techniques. For both coating types, the effect of coating parameters (spray particle velocity and temperature) on the microstructure and physical properties of the coatings was assessed. Fe–24Al (wt%) coatings were prepared using HVOF thermal spraying at spray particle velocities varying from 540 to 700 m/s. Mo–13.4Si–2.6B coatings were prepared using APS at particle velocities of 180 and 350 m/s. Residual stresses in the HVOF FeAl coatings were compressive, while stresses in the APS Mo–Si–B coatings were tensile. In both cases, residual stresses became more compressive with increasing spray particle velocity due to increased peening imparted by the spray particles. The hardness and elastic moduli of FeAl coatings also increased with increasing particle velocity. For Mo–Si–B coatings, plasma spraying at 180 m/s resulted in significant oxidation of the spray particles and conversion of the T1 phase into amorphous silica and a-Mo. The T1 phase was retained after spraying at 350 m/s.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: DOE - FE
• DOE Contract Number: AC07-99ID13727
• OSTI ID: 912193
• Report Number(s): INEEL/JOU-03-00603
• Journal Information: Intermetallics, Journal Name: Intermetallics Journal Issue: 12 Vol. 12; ISSN 0966-9795; ISSN IERME5
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AIR
COATINGS
Coatings
HARDNESS
Iron aluminides (based on FeAL)
MICROSTRUCTURE
Molybdenum silicides
OXIDATION
PHYSICAL PROPERTIES
PLASMA
RESIDUAL STRESSES
SHOT PEENING
SILICA
STRESSES
Thermal properties
VELOCITY
intermetallic
residual stress measurement