Abstract—The results of studying the structure of materials with maximum hardness and fracture toughness values, which are obtained by hot pressing of mixtures of commercial Cr₂O₃ micro powders with 15, 25, and 35 wt % AlN, are reported. It is shown that these materials have the dispersed heterophase structure regardless of the composition of the initial mixture. It includes new phases, namely, a matrix of solid solutions of variable compositions of the (Cr_1 – x–Al_x)₂O₃ (0 < x < 0.9) type and dispersed inclusions based on Cr₂N. The content and size of the latters increase with an increase in the content of aluminum nitride in the starting mixture. The ratio of Al and Cr in the solid solution depends on the composition of the starting mixture. The content of aluminum present in dispersed inclusions based on Cr₂N increases from 1.8 to 4 wt % with an increase the amount of aluminum nitride in the original mixture from 15 to 35 wt %. The hardness and fracture toughness of the materials are reduced by 2.4 GPa and 1.1 MPa m^1/2, respectively. It is shown that the cutting blades obtained from the Cr₂O₃–15AlN mixture are competitive, under conditions of fine grinding of carbon steel ShKh15 (HRC 62), to the blades of traditional CC650 ceramics most widespread today when scored by the price–quality criterion.

摘要—研究了​​通过热压商用Cr ₂ O ₃微粉与15、25和35 wt％AlN的混合物获得的具有最大硬度和断裂韧性值的材料结构的结果。结果表明，这些材料具有分散的异相结构，而与初始混合物的组成无关。它包括新的相，即（Cr _{1 –  x} –Al _x）₂ O ₃（0 < x <0.9）类型的可变组成的固溶体矩阵和基于Cr _2的分散夹杂物N.后者的含量和尺寸随着起始混合物中氮化铝含量的增加而增加。固溶体中Al和Cr的比例取决于起始混合物的组成。基于Cr ₂ N的分散夹杂物中存在的铝含量从1.8 wt％增加到4 wt％，而原始混合物中氮化铝的含量从15 wt％增加到35 wt％。材料的硬度和断裂韧性分别降低了2.4 GPa和1.1 MPa m ^1/2。显示出由Cr ₂ O ₃获得的切割刀片在按价格-质量标准评分时，在精细研磨碳素ShKh15（HRC 62）碳钢条件下，–15AlN混合物与传统CC650陶瓷刀片相比具有竞争优势。