Y-α/β-Sialon Ceramics and Its Fatigue Behavior

Abstract

Abstract: The investigations were mainly focused on the phase composition, microstructure and fatigue behavior of fully-dense Y-α/β-Sialon
ceramics prepared from powder mixtures of Si₃N₄, AlN and Y₂O₃ by using gas pressure sintering technique.

The results obtained show that the typical microstructure of mixed Y-α/β-Sialon ceramics consists of needle-like grains of the β-phase and equi-axed α-Sialon grains
with a small amount of glassy phase and J-Y4Si₂O₇N₂[102] crystalline phase on grain boundaries.

The cyclic fatigue crack growth behavior from microindentation flaws was investiated with gas pressure sintered Y-α/β-Sialon ceramics, A V-shape behavior was observed in the relation between the maximum applied stress intensity factor and crack
growth rates which are sensitive to the level of applied stresses.

Key words: Sialon, GPS, microstructure, vickers indentation, cyclic fatigue crack growth

WU Fengying,ZHAN Guodong,ZHUANG Hanrui,LAI Tingrong. Y-α/β-Sialon Ceramics and Its Fatigue Behavior[J]. Journal of Inorganic Materials.

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Y-α/β-Sialon Ceramics and Its Fatigue Behavior

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