The Influences of TiN Content on the Properties of the In Situ Al2O3-TiN Composites
Tabular alumina, α-Al2O3 powder, TiO2 powder and metal aluminum powder in purity of 99%(by mass) were uesd to prepare the Al2O3-TiN composite ceramics by mechanical mixing and thermal reduction of aluminum in situ reaction sintering in the flow of nitrogen gas under atmospheric pressure;the influences of phase composition and microstructure changes at 1200°C-1500°C nitridation reaction in situ,different amount of TiN formations and sintering temperature on the properties of the samples were analyzed by thermal analysis, XRDand SEM. The results show that: TiO2 was reduced by Al and then nitrided as TiN in the test temperature, the porosity has been increasesd while the bulk density has been decreased with the increased content of TiN formation because of the process of nucleation growth and the strong exothermic of the reaction.The mechanical properties of the composites are relatively better of TiN generated 10%content,because the structure of the skeleton formed by corundum was filled of part matrix evenly and was integrated closely by the matrix.
X. M. Feng et al., "The Influences of TiN Content on the Properties of the In Situ Al2O3-TiN Composites", Advanced Materials Research, Vols. 311-313, pp. 1906-1910, 2011