Pure ${\mathrm{Al}}_2{\mathrm{TiO}}_5$ tends to decompose into ${\mathrm{Al}}_2{\mathrm{O}}_3$ and ${\mathrm{TiO}}_2$ at temperatures ranging from 800 to 1300 $°$C. The addition of additives such as ${\mathrm{SiO}}_2$, ${\mathrm{ZrO}}_2$, mullite and ${\mathrm{ZrTiO}}_4$ restrict the thermal decomposition by limiting the grain growth.

The objective of the present work is to obtain ${\mathrm{Al}}_2{\mathrm{TiO}}_5$ ceramic materials stabilized with different zircon proportions, and study their sintering behavior and flexural strength.

For this, equimolar mixtures of ${\mathrm{Al}}_2{\mathrm{O}}_3$ and ${\mathrm{TiO}}_2$ powders carried out; three different ${\mathrm{ZrSiO}}_4$ proportions were studied (5, 15 and 30 % wt). Samples were pressed and sintered up to 1500 °C, with 2 h dwelling. The materials characterization included textural properties, mechanical properties and resulting crystalline phases. As well the microstructure (SEM) and thermal expansion behavior were studied.

The zircon addition stabilized the ${\mathrm{Al}}_2{\mathrm{TiO}}_5$ phase. This was accompanied by ${\mathrm{ZrTiO}}_4$ and mullite as secondary phases.

An interlocking multiphase microstructure was determined. The developed grains size range was between 2 and 10 $𝝁$m. The presence of the typical micro-cracks was also described.

The sintering grade was enhanced by the presence of the $\mathrm{Zr}S{\mathrm{iO}}_4$. This was observed by the microstructural analysis and the porosity decrease; the achieved porosity was below 9.4 %. An almost null thermal expansion behavior was evaluated for the studied materials below 1000 $°$C.

Finally the flexural strength was evaluated. This is proportional to the sintering grade and the initial zircon addition; 48.7 MPa was achieved.

The obtained results encourage the use of this family of materials in structural applications subjected to severe thermomechanical conditions.