Effect of alumina addition on the feldspathic porcelain bodies - Strengthening of feldspathic porcelain bodies by alumina

Densification process, microstructure and mechanical strength of the feldspathic porcelain bodies were investigated as a function of alumina addition. A maximum flexural strength of 150 MPa was obtained by addition of 50 mass % of alumina and by subsequent firing at 1350 degrees C. Packing ratio and flexural strength showed a linear correlation and its gradient (k-value), which indicates a degree of the effect for the reinforcement during densification, increased linearly with increasing amount of alumina. Particles of alumina added to the bodies retained the original shape and size after firing. It is considered that dispersion of alumina particles improved the reinforcement of the bodies.