Pillared Smectite Clay Coatings for Ceramic‐Matrix Composites

Abstract

This paper describes a novel route for the low-temperature formation of mullite, from pillared smectite clay precursors, for use as fiber coatings in ceramic-matrix composites. In particular, alumina-pillared bentonite converts in part to mullite at the unusually low temperature of about 800°C. The clay precursors display excellent film-forming capability and have been coated onto silicon carbide fibers. Mechanical tests on composites of the coated fibers and a borosilicate glass demonstrate their success as debond coatings, suggesting that this approach is a viable and simple route to oxide coatings for fibers.

Preparation of α-alumina-supported mesoporous bentonite membranes for reverse osmosis desalination of aqueous solutions

“…6 shows the XRD patterns of the clay powders calcined at different temperatures for 3 h. The crystal structure was stable after being fired at 700 • C. However, the d 001 value was found to decrease from 10.32 to 9.99 Å when the heat treatment temperature increased from 45 to 700 • C. The d 001 is the distance between the upper surfaces of two neighboring layers, namely the sum of the single layer thickness and the interlayer space. The d 001 values around 10 Å indicate closure of the interlayer space after being dried at 45 • C for 48 h, because the thickness of the octahedral clay plates is about 9.6 Å [10,13].…”