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There were examined four ways of applying sintering additives (Y
2
O
3
: Al
2
O
3
= 3 : 5) to particles of commercial Si
3
N
4
powders differing in particle size composition: amorphous nanopowder and microcrystalline α-Si
3
N
4
powder. The oxide sintering additive coating was produced in two steps: wet chemical preparation of the starting Si
3
N
4
powder with compounds containing yttrium and aluminum ions and annealing of the resultant powder composites at a temperature of 1000°C in air. The way the sintering addition is applied and the particle size composition of the starting Si
3
N
4
powder have been shown to influence the composition of the crystalline phases forming during annealing. The optimal process for obtaining Si
3
N
4
ceramics with improved physical and mechanical properties is spray drying, which makes it possible to obtain spherical agglomerates.