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研究探讨了将多种碳纳米结构作为氮化硅复合材料增强剂的应用。选取了具有较高说服力的碳材料用作填充剂,包括多层与单层纳米管(MWCNTs、SWCNTs)、石墨、炭黑纳米颗粒以及石墨微颗粒。这些材料以3%的质量分数分散在氮化硅基体中。高效研磨机用于基体第二相的快速分散。目前,烧结工艺的新技术[热等静压(HIP)和放电等离子烧结(SPS)]已应用于碳纳米管微结构的增强与调整,即增强氮化硅基复合材料。氮化硅基复合材料系统保留了原有系统的力学强度。为表征由两种不同烧结方法制备的复合材料,对其分别进行了弹性模量测试、硬度及断裂韧性的微压痕观察、扫描电子显微镜(SEM)、透射电镜(TEM)和X-射线衍射实验。
The application of a variety of carbon nanostructures as reinforcing agents for silicon nitride composites has been investigated. A more persuasive carbon material was selected as a filler, including multilayer and single-walled nanotubes (MWCNTs, SWCNTs), graphite, carbon black nanoparticles, and graphite microparticles. These materials are dispersed in a silicon nitride matrix at a 3% mass fraction. Efficient grinding machine for rapid dispersion of the second phase of the matrix. At present, new technologies of sintering process [HIP and SPS] have been applied to enhance and adjust the microstructure of CNTs, that is to say, to reinforce silicon nitride-based composites. The silicon nitride-based composite system retains the mechanical strength of the original system. In order to characterize the composites prepared by two different sintering methods, the composites were tested by elastic modulus, hardness, fracture toughness, SEM, TEM and XRD experiment.