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Fracture and Stiffness Characteristics of Particulate Composites of Diamond in Zinc Sulfide
Author(s) -
Farquhar Donald S.,
Raj Rishi,
Phoenix S. Leigh
Publication year - 1990
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.1151-2916.1990.tb06719.x
Subject(s) - materials science , composite material , fracture toughness , diamond , elastic modulus , brittleness , ultimate tensile strength , zinc sulfide , ceramic , composite number , fracture (geology) , stiffness , toughness , zinc , metallurgy
Diamond particles have been embedded in hot‐pressed zinc sulfide (ZnS) ceramic to improve various mechanical properties while preserving special optical properties. Roomtemperature mechanical tests on small specimens have shown that adding 10 wt% diamond to ZnS has no effect on the yield stress, but increases the tensile strength and the elastic moduli ∼20%, and increases the fracture toughness ∼100%. The doubling in fracture toughness can be explained by elastic interaction of the diamond particles with the crack‐tip stress field. The results and the interpretation presented here are believed to represent a class of composite materials where both constituents are brittle but the dispersed phase has a much higher elastic modulus than the matrix.