Premium
Low‐Temperature Crack Closure in Fluoride Glass
Author(s) -
Lehman Richard L.,
Hill Richard E.,
Sigel George H.
Publication year - 1989
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.1151-2916.1989.tb06156.x
Subject(s) - materials science , fluoride , composite material , indentation , relaxation (psychology) , humidity , atmospheric temperature range , aperture (computer memory) , phase (matter) , chemistry , thermodynamics , structural engineering , inorganic chemistry , social psychology , psychology , physics , engineering , organic chemistry
Radial cracks generated in heavy‐metal fluoride glass (HMFG) by Vickers indentation were found to decrease in length as a function of time when exposed to humid environments in the temperature range of 22° to 80°C. Inspection by optical and electron microscopy indicated that the cracks appear to be closing, leaving little or no evidence of the original crack aperture. The effect was observed to increase with time, temperature, and humidity levels for all conditions studied. Possible explanations for this behavior include viscous relaxation of glass in the region of the crack tip, or the generation and transport of a fluoride gel phase to the crack aperture.