Comparison between plasma- and HVOF-sprayed ceramic coatings. Part I: microstructure and mechanical properties. (10th May 2007)

• Record Type: Journal Article
• Authors: Bolelli, G.; Lusvarghi, L.; Manfredini, T.; Pighetti Mantini, F.; Polini, R.; Turunen, E.; Varis, T.; Hannula, S-P.
• Is Part Of: International journal of surface science and engineering. Volume 1:Number 1(2007)
• Page Start: 38
• Page End: 61
• Publication Date: 2007-05-10
• Subjects: high velocity oxygen fuel -- HVOF flame spraying -- plasma spraying -- ceramic coatings -- Al2O3 -- Cr2O3 -- microstructure -- properties correlation -- Vickers microindentation -- indentation fracture toughness -- mechanical properties -- nanostructures -- micromechanics; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Surfaces (Technology) -- Periodicals; Tribology -- Periodicals; 530.417
• Languages: English
• ISSNs: 1749-785X

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.