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Fabrication of Oriented SiC‐Whisker‐Reinforced Mullite Matrix Composites by Tape Casting
Author(s) -
Wu Mianxue,
Messing Gary L.
Publication year - 1994
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.1151-2916.1994.tb04646.x
Subject(s) - whisker , whiskers , materials science , mullite , tape casting , composite material , casting , fabrication , monocrystalline whisker , percolation (cognitive psychology) , percolation threshold , ceramic , electrical resistivity and conductivity , medicine , alternative medicine , pathology , engineering , neuroscience , electrical engineering , biology
Dense SiC‐whisker‐reinforced mullite composites with up to 50 vol% whiskers can be obtained by tape casting and hot pressing. The tape casting process results in high degrees of SiC whisker orientation as determined visually and by X‐ray diffraction. The ability to achieve dense composites with as much as 50 vol % whiskers is attributed to the higher percolation threshold of aligned whiskers. The factors affecting the degree of whisker orientation during tape casting are described using a fluid dynamics model derived from Jeffery's equations and show that the orientation of anisometric particles is enhanced primarily by the casting rate and particle aspect ratio.