Comparison between plasma- and HVOF-sprayed ceramic coatings. Part I: microstructure and mechanical properties
by G. Bolelli, L. Lusvarghi, T. Manfredini, F. Pighetti Mantini, R. Polini, E. Turunen, T. Varis, S-P. Hannula
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 1, No. 1, 2007

Abstract: Few papers deal with High Velocity Oxygen-Fuel (HVOF) sprayed ceramics. This two-part study thoroughly compares HVOF sprayed Al2O3, nanostructured Al2O3, Cr2O3 to Atmospheric Plasma Sprayed (APS) ones. The first part discusses microstructure and micromechanics. HVOF-sprayed ceramics achieve superior cohesion (lower porosity and lower average pore area). Size effects in Vickers microindentation tests are different for HVOF and APS ceramics. At 1 N load, hardness is higher for HVOF coatings (no cracking). Under 5 N and 10 N loads, hardness decreases gradually for HVOF coatings; APS coatings are largely cracked at 5 N. HVOF-sprayed ceramics are tougher than APS ones and have higher elastic modulus.

Online publication date: Wed, 09-May-2007

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