Silicon nitride find its application in quality of high-temperature ceramics and can be considered as one of the most promising dielectrics. Different properties and microstructure of pressureless sintered silicon nitride have been described a lot. The effect of various oxide additives and sintering regimes has also been often shown and discussed. However, there is not so much information about the influence of complex triple additives on properties of silicon nitride. In our work, we described the manufacture of high-dense Al2O3-MgO-Y2O3, Al2O3-MgO-La2O3 and Al2O3-La2O3-Y2O3 doped presureless sintered silicon nitride with high microhardness. The effect of different oxide compositions of yttrium, magnesium and lanthanum with Al2O3 on such important properties as shrinkage, microhardness and both green body density and density of sintered ceramics have been characterized.Keywords: Materials science, ceramics, properties, oxide additives, powders
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