The powder mixtures of Talc-Kaolinite-Alumina-Basalt-Quartz were mechanically activated in a planetary ball mill for 1 hour. The structural alterations and thermal behaviour of the powder mixture were examined by X-ray diraction (XRD), scanning electron microscopy (SEM) and thermal analysis (TG-DTA). The results showed that the mechanical activation led to amorphisation and decreased the temperature of cordierite formation.
Structural ceramic parts such as those made from Si3N4 or SiAlONs are promising for
considering them in replacing metals in the areas where harsh environmental conditions like
abrasive corrosion under high stresses along with high temperature effects are dominant. A
widespread use of these ceramics depends on the ease of finding them with low cost. This paper
highlights some important points on the low cost production technique of Si3N4 or SiAlON
ceramics in powdered form via carbothermal synthesis technique using minerals in the light of the
current and previous works. The technique gives flexibility of controlling production parameters
that affect on the yield and quality of powders produced. A special account is given to the effects of
reactants on the production of such ceramic powders. After synthesising ceramics in powdered
form, some comparisons were made on the characterisation of the products of homemade ones with
that of commercially available ones. After successful experimental works, a raw material of
orthoclase clay mineral exhibited a high transformation potential to a mixture of Si3N4 and SiAlON
type ceramic powders.
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