Reactive spark plasma sintering of ZrH2, BN, and B powder mixtures in the temperature range 1500–1900°C was used to produce a ZrN–ZrB2 ceramic composite with 35–80 wt.% ZrB2. The phase transformations in the temperature range 900–1900°C, the nature of densification at 1800°C, and the effect of composition and sintering temperature on the mechanical properties of the sintered composites were examined. The densification process occurs in four stages at a sintering temperature of 1800°C. At the first sintering stage, ZrH2 starts dehydrogenating with the release of atomic (molecular) hydrogen (before the time dependence of shrinkage becomes S-shaped). The second stage involves chemical reactions in the system. At the third and fourth stages, synthesized ZrN and ZrB2 are sintered directly. The zirconium–boron interaction proceeding through selfpropagated high-temperature synthesis influences the densification and final structurization of the composites. As a result, the highest mechanical properties are exhibited by the samples with 80 wt.% ZrB2 sintered in the range 1800–1900°C.

中文翻译：

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火花等离子烧结法合成 ZrN-ZrB2 复合材料

ZrH2、BN 和 B 粉末混合物在 1500-1900°C 温度范围内的反应放电等离子烧结用于生产 ZrN-ZrB2 陶瓷复合材料，其中 ZrB2 重量百分比为 35-80%。研究了 900-1900°C 温度范围内的相变、1800°C 致密化的性质以及成分和烧结温度对烧结复合材料机械性能的影响。在 1800°C 的烧结温度下，致密化过程分四个阶段进行。在第一个烧结阶段，ZrH2 随着原子（分子）氢的释放开始脱氢（在收缩的时间依赖性变为 S 形之前）。第二阶段涉及系统中的化学反应。在第三和第四阶段，合成的 ZrN 和 ZrB2 被直接烧结。通过自蔓延高温合成进行的锆-硼相互作用影响复合材料的致密化和最终结构化。因此，在 1800-1900°C 范围内烧结的含有 80 wt.% ZrB2 的样品表现出最高的机械性能。