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Effect of Seeding on the Microstructure and Mechanical Properties of α‐SiAlON: I, Y‐SiAlON
Author(s) -
Zenotchkine Misha,
Shuba Roman,
Kim JooSun,
Chen IWei
Publication year - 2002
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.1151-2916.2002.tb00254.x
Subject(s) - sialon , microstructure , seeding , materials science , weibull modulus , ceramic , composite material , fracture toughness , modulus , toughness , phase (matter) , weibull distribution , mineralogy , chemistry , thermodynamics , mathematics , physics , organic chemistry , statistics
The effect of seeding on the microstructure and mechanical properties of single‐phase Y‐α‐SiAlON ceramics with elongated grains has been studied. Seeds of the intended α‐SiAlON compositions but with different size, shape, and number of grains have been compared for their effects. The microstructure, resistance (R‐curve) behavior, and Weibull modulus are strongly correlated to the number density of the seeds. The highest fracture toughness reached is ∼12 MPa·m 1/2 and can be obtained with as little as 1% seeding. The thermodynamic stability of seeds has been examined and is attributed to their chemical composition.