This work is devoted to the fabrication of ZrB₂–ZrSi₂–MoSi₂-based composite powder ceramics by self-propagating high-temperature synthesis (SHS) according to the scheme of magnesium thermal reduction from oxide feedstock and its subsequent hot-pressing (HP) consolidation. The combustion of reaction mixtures has rather high adiabatic temperatures in a range of 2060–2120 K and burning rates in a range of 8.3–9.4 g/s. The end product yield of the magnesiothermal reduction is 34–38%. The resulting powder contains 13–47% ZrB₂, 21–70% ZrSi₂, 2–32% ZrSi, and 10–18% MoSi₂, depending on the composition of the initial reaction mixture; has high structural homogeneity; and consists of composite polyhedral particles with an average size on the order of 8 μm. The structure of ceramics consolidated by HP from the SHS powder is homogeneous and includes needle ZrB₂ grains distributed in the ZrSi₂ matrix, MoSi₂ inclusions of various morphologies, and inclusions of ZrSiO₄ silicate distributed over the ZrSi₂ grain boundaries. The HP-formed samples have a high degree of homogeneity of the chemical composition and residual porosity of 2.5–7.4%.

中文翻译：

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Zr-Si-Mo-B体系中多组分粉末陶瓷的磁热合成与固结

这项工作致力于通过自蔓延高温合成（SHS）根据氧化镁原料热还原镁的方案及其随后的热压工艺，制造ZrB ₂ -ZrSi ₂ -MoSi ₂基复合粉末陶瓷。 HP）合并。反应混合物的燃烧具有很高的绝热温度，范围为2060-2120 K，燃烧速率为8.3-9.4 g / s。镁热还原的最终产品产率为34–38％。将得到的粉末含有13-47％的ZrB ₂，21-70％ZrSi ₂，2-32％ZrSi，和10-18％的MoSi ₂，取决于初始反应混合物的组成；结构同质性高 由平均尺寸为8μm的复合多面体颗粒组成。由HP从SHS粉末中固结的陶瓷结构是均匀的，并且包括分布在ZrSi ₂基体中的针状ZrB ₂晶粒，各种形态的MoSi ₂夹杂物以及分布在ZrSi ₂晶界上的ZrSiO ₄硅酸盐夹杂物。惠普形成的样品具有高度的化学成分均匀性和2.5-7.4％的残留孔隙率。