| Microstructure and Mechanical Properties of Sol-Gel
Derived Mullite Containing Needle-Like Grains |
M. Shahida Banu and F. D. Gnanam
Pages : 122-124
DOI : 10.1080/0371750X.2002.10800045 |
| Abstract |
| Synthesis of mullite whiskers in r atmosphere was carried out
by means of vapour-phase reaction. A mullite precursor sol was
prepared by mixing aluminium nitrate and ethyl silicate in pro~
anol medium. The addition of HF triggers the gelation of mul·
hte. The powders was uniaxially pressed into bars and was heattreated
at 1100°C In an airtight container. During this process, .
mullite whiskers were formed and they were used as growth centres
for needle like grains. The sapmles when sintered at 1&oo•c
for 4 h in air, showed needle morphology and the fracture toughness
was 2.3 MPa.m112. |
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