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首页> 外文期刊>Ceramic Engineering and Science Proceedings >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：放电等离子体烧结制备的高温高温陶瓷的加工，微观结构和力学性能

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摘要

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℃ 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：近来，通过热压，反应热压和无压烧结等各种方法合成了锆基超高温陶瓷（UHTC）-二硼化锆（ZrB_2）和碳化锆（ZrC）-掺有碳化硅（SiC）。火花等离子体烧结，也称为FAST（现场辅助烧结技术）或PECS（脉冲电流烧结），是一种新颖的工艺，具有较高的加热和冷却速率，因此非常适合批量生产。较高的加热和冷却速度以及压力可防止晶粒粗化，因此可增强致密性。在这项研究中，将具有不同百分比的碳化锆（ZrC），二硼化锆（ZrB_2）和碳化硅（SiC）的UHTC复合材料在1950℃下烧结不同的保持时间。研究了如此合成的复合材料的机械性能和微观结构，已使用火花等离子体烧结法合成了超高温硬质合金，其理论密度超过95％，其机械性能（硬度，断裂韧性和弯曲强度）与之前使用其他方法的不同研究人员所报道的相当传统的烧结方法。这项研究对在相似条件下烧结的UHTC的各种ZrC，ZrB_2和SiC基成分的性能进行了比较分析。

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