Ak. Gupta et Tk. Dan, DEVELOPMENT OF HEAT-TREATED LIGHTWEIGHT TERRA-COTTA BODIES CONTAININGLOW-GRADE TALC, Research and Industry, 39(3), 1994, pp. 160-164
Additives not only improves the required properties in final product l
ike dimensional accuracy, water absorption, mechanical strength, etc.
but also contributes to energy conservation (being used as fluxes), in
sulating properties, act as filler and extender. Keeping this in view,
a study on the influence of a additive (low grade talc) on red clay w
as carried out to develop heat treated light weight bodies by measurin
g dry and fired properties, when added progressively. The influence of
low grade talc additions to plastic red clay is progressively more si
gnificant with increase in firing temperatures from 950-degrees to 110
0-degrees-C. The impurities present in talc mainly free lime behaves a
s an inert material at low temperatures (< 950-degrees-C) and then as
an opening agent at higher temperatures up to 1050-degrees-C and thus
reducing the fired shrinkage to appreciable extent.