In this study, two different starting compositions were prepared according to two cation values, and then the mixture was compacted uniaxially in a die and the green compacts were subjected to cold isostatic pressing. They were sintered at 1700 °C and 1750 °C for 30 and 120 min under nitrogen atmosphere. The sintered compacts were analyzed for hardness, densification phase and microstructure. The compacts were analyzed using X-Ray, SEM-EDS techniques. The density of the samples was measured by the Archimedes method. The results showed that starting composition was suitable for manufacturing of Y- SiALON ceramics. The addition of Y2O3 and Al2O3 were resulted in the formation of liquid phase, but alumina was increased the hardness and densification of the compacts. It was also suggested that, for the densification of the Y-SiALON compacts at 1700 °C, is suitable. Above 1700 °C, a shorter sintering time should be used since there was weight loss in the compacts, as a result of the vaporization of nitrogen from the nitrides and oxides structures.