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Effect of zirconium diboride addition on the properties of silicon carbide composites

机译：二硼化锆的添加对碳化硅复合材料性能的影响

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摘要

SiC and its composites have large potential in the aerospace sector due to their inherent advantages. However, the beneficial properties of high hardness and high strength of SiC cause problems in fabricating these composites by machining. Electro discharge machining (EDM) is found to be reliable technique to machine such hard materials and demands the work material to be conductive. Thus the present work focuses on synthesizing SiC composite with 10, 20, 30 vol% zirconium diboride (ZrB_2) as reinforcement to study the physical and mechanical properties and its machinability by EDM. SiC and its composites were vacuum hot pressed at 1900 °C to near theoretical densities. It was observed that with the addition of ZrB_2, hardness of the composite increased while the flexural strength decreased and the electrical resistivity decreased with increase of ZrB_2 content. Feasibility studies of machining the composites with EDM were carried out and the experiments showed that SiC-30 vol% ZrB_2 composite alone could be machined. This revealed that this composite possessed adequate conductivity for carrying out EDM.
机译：碳化硅及其复合材料具有固有的优势，因此在航空航天领域具有巨大的潜力。但是，SiC的高硬度和高强度的有益特性在通过机械加工制造这些复合材料时引起问题。发现放电加工（EDM）是加工此类硬质材料的可靠技术，并且要求工作材料具有导电性。因此，本工作着重于合成具有10、20、30％（体积）二硼化锆（ZrB_2）作为增强材料的SiC复合材料，以研究电火花加工的物理和机械性能及其可切削性。 SiC及其复合材料在1900°C真空热压至接近理论密度。观察到，随着ZrB_2含量的增加，复合材料的硬度增加，而抗弯强度降低，电阻率降低。进行了电火花加工复合材料的可行性研究，实验结果表明，仅SiC-30vol％ZrB_2复合材料即可加工。这表明该复合材料具有足够的导电性以进行EDM。

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