The effects of Wand Mo power additives during spark-plasma sintering of compositions at compression force 60 MPa at 1200 – 1600°C on the phase composition, microstructure, crystalline-phase grain size, relative density, linear shrinkage, physicomechanical properties, and the linear correlation of the elasticity modulus and fracture toughness of mullite–ZrB₂–β-SiC–TaC samples were studied. The synthesized ZrB₂, β-SiC, and TaC powders were characterized by extensive crystallization of ZrB₂, β-SiC, and TaC_cub, respectively. Sintered samples withWand Mo powder additives showed extensive mullite formation and more active crystallization of β-SiC, (Zr, Ta)B, C, β-WC, and β-WB than (Ta, Zr)C, B, β-MoC, β-MoB, and MoB₂ at 1200 – 1600°C. The microstructure of the sample with the Mo additive at 1500°C was more uniformly and densely sintered and crystalline; contained fewer pores and weakly sintered areas; and was more reinforced at the boundaries of oxide-free oxide and oxide-free crystalline phases. This sample had characteristically smaller grain sizes of the crystalline phases at 1400 – 1600°C and showed uniform growth of the relative density, linear shrinkage, and physicomechanical properties; higher crack resistance (with propagation of microcracks along a meandering path), and a better linear correlation of the elasticity modulus and fracture toughness at 1200 – 1600°C.

中文翻译：

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无氧化物组分和各种金属粉末添加剂的混合物的火花等离子体烧结条件下无氧化物氧化物材料的开发

在1200 – 1600°C下以60 MPa的压缩力对组合物进行火花等离子烧结过程中，Wand Mo动力添加剂对相组成，微观结构，晶相晶粒尺寸，相对密度，线性收缩，物理力学性能和线性的影响研究了莫来石-ZrB ₂ -β-SiC-TaC样品的弹性模量和断裂韧性之间的相关性。合成的ZrB ₂，β-SiC和TaC粉末分别通过ZrB ₂，β-SiC和TaC_立方晶的广泛结晶来表征。与（Ta，Zr）C，B，β-MoC， β-MoB和MoB ₂在1200 – 1600°C下。含Mo添加剂的样品在1500°C时的显微组织更加均匀，致密地烧结和结晶。孔隙少，烧结区域薄弱；并且在无氧化物的氧化物和无氧化物的晶相的边界处得到了更多的增强。该样品在1400 – 1600°C时具有较小的结晶相晶粒尺寸，并且相对密度，线性收缩率和物理力学性能均呈现均匀增长；更高的抗裂性（随着微裂纹沿着曲折路径的传播），以及在1200 – 1600°C时弹性模量和断裂韧性的线性关系更好。