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Fracture Toughness and Spalling Behavior of High‐Al 2 O 3 Refractories
Author(s) -
LARSON D. R.,
COPPOLA J. A.,
HASSELMAN D. P. H.,
BRADT R. C.
Publication year - 1974
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1974.tb11372.x
Subject(s) - spall , materials science , thermal shock , fracture toughness , composite material , fracture (geology) , fracture mechanics
The fracture energies and spalling resistance of high‐Al 2 O 3 refractories were studied. The fracture energies, γ WOF and γ NBT , were measured by the work‐of‐fracture and the notched‐beam‐test methods, respectively. Spalling resistance, as measured by the relative strength retained in a water quench, correlated well with the thermal‐stress resistance parameter applicable to stable crack propagation under conditions of thermal shock, (γ WOF /α 2 E 0 ). Many of the refractories exhibited high ratios of γ WOF to γ NBT ; such high ratios were shown analytically to maximize the parameter ( R 1111 = E 0γWOF /S 1 2 ) which describes the resistance to catastrophic spalling. The increase of crack length with increasing quenching temperature difference (Δ T ) was somewhat less than that predicted theoretically; the discrepancy was attributed to an increase of crack density with Δ T . In general, the results show that fracture energy is important in establishing the spalling resistance of high‐Al 2 O 3 refractories.