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Effect of Particle Additions on Drying Stresses and the Green Density of Sol‐Gel‐Processed Three‐Dimensional Ceramic‐Matrix Composites
Author(s) -
Liu HsienKuang,
ParviziMajidi Azar
Publication year - 1998
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.1151-2916.1998.tb02553.x
Subject(s) - materials science , composite material , ceramic , composite number , ceramic matrix composite , particle (ecology) , particle size , sol gel , methacrylate , ammonium hydroxide , matrix (chemical analysis) , chemical engineering , polymer , nanotechnology , copolymer , oceanography , engineering , geology
This paper investigates sol‐gel processing of three‐dimensional (3‐D) ceramic‐matrix composites, focusing on the effect of addition of particles on drying stresses and composite green density. A 3‐D woven carbon fiber/silica composite was used as the model material system for the investigation. Composites were fabricated with silica particle additions to the silica sol using a pressure infiltration technique, and the drying rate and matrix cracking were characterized. The particle size was varied in order to study the role of particle additions in the processing. Ammonium hydroxide (NH 4 OH) and a particle coating agent, 3‐(trimethoxysilyl)propyl methacrylate (TPM), were added in the mixture of particles and sol to improve particle packing in the preform. Sol‐gel processing with the addition of particles proves to be an effective route to fabricate 3‐D ceramic‐matrix composites with higher green density and less matrix cracking.