INVESTIGADORES
TOMBA MARTINEZ Analia Gladys
artículos
Título:
"Evaluation of the heat transfer coefficient in thermal shock of alumina disks"
Autor/es:
A.G. TOMBA MARTINEZ; A.L. CAVALIERI
Revista:
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2000 vol. A276 p. 76 - 82
ISSN:
0921-5093
Resumen:
Disks of a high-purity commercial alumina powder were fabricated by slip casting, precalcined, sintered and machined with SiC paper (120 and 320 grit). The specimens were tested in thermal shock conditions from several temperatures (Ti) between 870-980°C using a high-velocity air jet at room temperature (T0). The temperature differential between the disk and the air jet was incremented in 10°C until crack propagation was detected. During the air impinging, the temperature was recorded on the lower specimen surface at the central point and at a peripheral one. The coefficient governing the convective heat transfer on the specimen surface, h, was estimated by fitting the calculated temperature profiles with those measured during the test. Three alternative models were proposed for the temperature calculations using a finite element analysis.
