Abstract Theoretical analysis shows that cutting ceramic based on silicon nitride is much stronger if the recipe is as follows: $$ \geqslant $$ 50% Si 3 N 4 , $$ \geqslant $$ 20% Al 2 O 3 , $$ \geqslant $$ 19% ТiC. Dispersional hardening may be ensured by means of intermetallic inclusions formed by alloying elements such as molybdenum (2–3%), beryllium, and boron (0.5–1%) and also carbide-forming metals (chromium and nickel). Research indicates that the carbides formed are most favorably positioned if the initial structure of the modified cutting ceramic based on silicon nitride contains δ ferrite. That decreases their brittleness. When sintering inserts of cutting ceramic based on silicon nitride, heating ensures the solution of all the phases (primarily carbides). Otherwise, the martensitic point (or interval) increases, and the concentration and strength of martensite decline. The presence of α phase in a base consisting of γ phase also lessens the deformability of NKRK-50 cutting ceramic based on silicon nitride. Quantitatively, its effect is about the same as that of γ phase in a base consisting of α phase.

中文翻译：

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用金属间夹杂物强化氮化硅切削陶瓷

摘要 理论分析表明，如果配方如下： $$ \geqslant $$ 50% Si 3 N 4 , $$ \geqslant $$ 20% Al 2 O 3 , $$ \ geqslant $$ 19% ТiC。弥散硬化可以通过由钼 (2-3%)、铍和硼 (0.5-1%) 等合金元素以及碳化物形成金属 (铬和镍) 形成的金属间夹杂物来确保。研究表明，如果基于氮化硅的改性切削陶瓷的初始结构包含δ铁素体，则形成的碳化物最有利地定位。这降低了它们的脆性。当烧结基于氮化硅的切削陶瓷刀片时，加热可确保所有相（主要是碳化物）溶解。否则，马氏体点（或区间）增加，马氏体的浓度和强度下降。由γ相组成的基体中α相的存在也降低了NKRK-50基于氮化硅的切削陶瓷的变形能力。从数量上讲，它的作用与α相组成的基体中γ相的作用大致相同。