Study of Sintering Behavior of Ceramic Composite Al_2O_3-TiO_2 Rare Reinforcing with La_2O_3 Possible Application as Ceramic Cutting Tools

摘要

In this work, composite ceramic was produced to base Al_2O_3 reinforced with 35% weight TiO_2 and variation 0-2% La_2O_3, were evaluated properties to study their microstructural characteristic and mechanical properties as applicable cutting tools. The ceramic composites were produced by thermo-mechanical process. It was observed from the results of XRD after sintering no new phase is formed, besides the characteristics of the precursor oxides. According to the result of particle size analysis before and 24 hours after milling, there was a reduction of the average diameter of agglomerate 95.25% which is suitable to assist sintering of the composite, because this reduction increases the reaction rate the raw material during firing. At microdurezavickers test it was observed that the sample with 1.5% La_2O_3 showed better hardness results.