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Microstructural Control of a 70% Silicon Nitride– 30% Barium Aluminum Silicate Self‐Reinforced Composite
Author(s) -
Yu Feng,
Nagarajan Nandakumar,
Fang Yi,
White Kenneth W.
Publication year - 2001
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.1151-2916.2001.tb00601.x
Subject(s) - materials science , flexural strength , microstructure , composite material , whisker , ceramic , silicon nitride , composite number , silicate , sintering , barium , melting point , indentation , silicon , silicon oxynitride , aluminium , crystallization , mineralogy , metallurgy , chemical engineering , engineering , chemistry
The processing response of a 70% silicon nitride–30% barium aluminum silicate (70%‐Si 3 N 4 –30%‐BAS) ceramic‐matrix composite was studied using pressureless sintering, at temperatures ranging from 1740°C, which is below the melting point of BAS, to 1950°C. The relationship between the processing parameters and the microstructural constituents, such as morphology of the β‐Si 3 N 4 whisker and crystallization of the BAS matrix, was evaluated. The mechanical response of this array of microstructures was characterized for flexural strength, as well as fracture behavior, at test temperatures up to 1300°C. The indentation method was used to estimate the fracture resistance, and R ‐curves were obtained from modified compact‐tension samples of selected microstructures at room temperature.