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首页> 外文会议>International Conference on Advanced Ceramics and Composites >PROCESSING, MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA HIGH TEMPERATURE CERAMICS FABRICATED BY SPARK PLASMA SINTERING
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PROCESSING, MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA HIGH TEMPERATURE CERAMICS FABRICATED BY SPARK PLASMA SINTERING

机译：通过火花等离子烧结制造的超高温陶瓷的加工，微观结构和力学性能

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Recently, Zirconium based ultra high temperature ceramics (UHTC) - Zirconium Diboride (ZrB_2) and Zirconium Carbide (ZrC) - with Silicon Carbide (SiC) additions have been synthesized by various methods such as hot pressing, reactive hot pressing and pressureless sintering. Spark plasma sintering, also known as FAST (Field assisted sintering technique) or PECS (Pulse Electric Current Sintering), is a novel process characterized by high heating and cooling rates and is, therefore, ideally suited for bulk manufacturing. The high heating and the cooling rates coupled with pressure prevents grain coarsening and, therefore, enhances densification. In this research, UHTC composites with varying percentages of Zirconium Carbide (ZrC), Zirconium Diboride (ZrB_2) and Silicon Carbide (SiC) were sintered at 1950°C for varying hold times. Mechanical properties and microstructures of the composites thus synthesized were studied. UHTCs have been synthesized using spark plasma sintering to more than 95% theoretical density and with mechanical properties (hardness, fracture toughness and bending strength) comparable to those reported previously by different researchers using other conventional sintering methods. This research gives a comparative analysis of the properties of various ZrC, ZrB_2 and SiC based compositions of UHTCs sintered under similar conditions.
机译：最近，基于锆的超高温陶瓷（UHTC） - 锆二硼化物（ZrB_2）和碳化锆（ZrC） - 用碳化硅（SiC）添加已经通过各种方法合成，例如热压，反应热压和无压烧结。火花等离子体烧结，也称为快速（现场辅助烧结技术）或PEC（脉冲电流烧结），是一种新的加热和冷却速率，因此是非常适合散装制造的新方法。高加热和冷却速率与压力联接防止晶粒粗化，因此增强了致密化。在该研究中，具有不同百分比的碳化锆（Zrc），锆二硼化物（Zrb_2）和碳化硅（SiC）百分比的UHTC复合材料在1950℃下烧结，以进行不同的保持时间。研究了由此合成的复合材料的机械性能和微观结构。使用火花等离子体烧结合成了UHTC，以超过95％的理论密度和机械性能（硬度，断裂韧性和弯曲强度），所述机械性能（硬度，断裂韧性和弯曲强度）可与先前使用其他常规烧结方法以前通过的不同研究人员进行的。该研究赋予了在类似条件下烧结的各种ZRC，ZrB_2和SiC基于UHTCS组合物的性质的对比分析。

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