Effect of uniaxial pressure on ultrasound velocities and elastic moduli in plasma sprayed ceramics

0212391 - UT-L 20030108 RIV US eng J - Journal Article
Landa, Michal - Kroupa, František - Neufuss, Karel - Urbánek, Přemysl
Effect of uniaxial pressure on ultrasound velocities and elastic moduli in plasma sprayed ceramics.
Journal of Thermal Spray Technology. Roč. 12, č. 2 (2003), s. 226-233. ISSN 1059-9630. E-ISSN 1544-1016
R&D Projects: GA ČR GA106/00/D106; GA ČR GA106/01/0094
Institutional research plan: CEZ:AV0Z2043910; CEZ:AV0Z2076919
Keywords : compressive stressed * elastic stiffnesses * plasma-sprayed ceramics
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
Impact factor: 0.726, year: 2003

Microcrackt and thin voids in plasma- sprayed ceramics are known to be responsible for elastic anisotropy and for small values of elastic stiffness constants (measured at small stresses), compared with well-sintered materials. The increase of ultrasound velocities with increasing uniaxial pressure up to 300 MPa in three tzpes of plasma-sprayed ceramics was measured in two directions. The corresponding elastic stiffnesses increased from 1.4 to 4.7 times. The experimental results were explained by closing of intrasplat microcracks and interpsplat thin voids by uniaxial pressure.
Permanent Link: http://hdl.handle.net/11104/0107939