Effect of nano-TiO2 content on the mechano-physical properties of electro-technical porcelain

In the present work, the properties of triaxial porcelain for electrical applications were enhanced by consolidating the ceramic matrix using nanoscale particles. The influence of nano-titanium dioxide on the properties of uniaxially pressed samples sintering at 1250 degrees C was evaluated. Physical properties were determined by measuring the bulk density and porosity. The mechanical behavior was evaluated by compressive strength and microhardness. Microstructural analysis and phase analysis were carried out by scanning electron microscopy, Xray diffraction, and Raman spectroscopy. The highest mechanical strength achieved by the nanostructured porcelain compositions was approximately 65% higher than that exhibited by the traditional siliceous porcelain. From a microstructure perspective, the nano-titanium dioxide particles developed compressive stresses (prestressing effect) in the vitreous phase, due to the different thermal expansion coefficients they display. Besides, the dispersed nano-titanium dioxide particles act as a strong barrier and thereby cause the deflection of crack when loading.