Subcritical crack growth in Y–Al–Si–O–N glass

Abstract

Oxynitride glass (Al 2O 3 · ( 3 2 ) Y 2O 3 · ( 3 4 ) SiO 2 · ( 3 4 ) Si 3N 4) has exhibited subcritical crack growth when submerged in deionized water. Crack velocities ranging from 10 −7 to 10 −5 m/s were observed for applied stress intensities ranging from 0.67 to 0.69 MPa m 1/2, respectively, using the constant moment double cantilever beam technique. A power-law exponent of 142 ± 9 and kinetics parameter of 216 ± 14 were calculated. It was difficult to produce stable crack growth in oxynitride glass in an air environment. A commercial glass slide was used to verify the experimental technique, and the data for the glass slide was consistent with previous reports in the literature.