This paper reports the development of a sturdy reactive-linked ceramics based on Al2O3(Al)-SiC-BN-Si3N4 system. Ceramic samples of different initial compositions and varied manufacturing procedure were studied by XRD; mechanical strength of these samples is discussed. It is stated that such products of chemical interactions occurring during ceramics production, as Si and AlN positively affects ceramics strength. The effect of aluminum, aluminum borates, and silicon nitride content on the strength of final ceramics is discussed.