Transactions of the INDIAN CERAMIC SOCIETY Vol. 51 1992
Strength and Thermal Shock Behaviour
of Synthetic Mullite
P. Y. DALY! AND A. K. KULKARNI
Pages : 101-104
DOI : 10.1080/0371750X.1992.10804551
Abstract
Synthetic mullite prepared from clay alumina mixture was sintered
around 1400°C and at 1600°C to obtain controlled porosity.
The sintered compacll were subjected to thermal shock between
l400°C and room temperature, and mechanical strength was
evaluated by compres.-;ive test measurement> at room temperature.
The porous (~20% OP) samples showed densification during
thermal shocks. The compressive strength Increased up to five
thermal cycles and decreased thereafter. The least porous (0.5 to
6% OP) samples retained the strength during thermal shocks
while impervious(< 0.5% OP) samples showed steady increase
in strength. The samples sintered at 1600°C, though Impervious,
had low strength and cracked after five thermal cycles due to the
separation of glas.ly phase from the matrix resulting In conchoidal
fracture.