Correlation of C/C preform density and microstructure and mechanical properties of C/C-ZrC-based ultra-high-temperature ceramic matrix composites

Abstract

Understanding the correlation of C/C preform density and microstructure and properties of the resulting composites is of great importance for the fast and economical fabrication of ultra-high-temperature ceramic matrix composites by reactive melt infiltration. In this paper, C/C-ZrC composites were prepared by eutectic Zr-Si alloyed melt infiltration using different density C/C composite preforms, and the influence of C/C preform densities on the microstructure and mechanical properties of the composites was investigated. The results showed that the densities of the composites decreased with the increase of the C/C preform densities while the open porosities always kept at small values.

Progress of layered double hydroxide-based materials for supercapacitors

“…[104][105][106] Besides, the poor conductivity can affect the transfer of electrons and full utilization of active sites. [107][108][109] The ultrathin nanosheet structure of LDHs usually leads to rapid structural deterioration under harsh electrochemical conditions, which eventually affects the usage performance. 110 To overcome these limitations, hybridized LDH-based nanostructures have been developed as potential multifunctional nanomaterials, and the fabrication of these materials with large specific surface area and more active sites is the key to improve their electrical conductivity and multiplicative properties.…”

Skin-like copper/carbon nanotubes/graphene composites and low thermogenesis during electromagnetic interference shielding

“…At present, carbon-based materials such as carbon nanotubes (CNTs), carbon nanofibers (CNFs), expanded graphite, and graphene are widely used in fields such as energy 18–22 and catalysis 23 and in the enhancement of composite materials. 24,25 Besides, they also show excellent EMI shielding effectiveness (SE) due to their reasonable conductivity, which gives them great potential in the field of new EMI shielding materials. 26 For instance, Al-saleh et al added multi-walled CNTs to acrylonitrile-butadiene-styrene (ABS) by a solution blending method, while Jang et al 27 further modified CNTs with pyrene-upy, and added them into polyamide 6 (PA 6) with both the prepared composites showing excellent EMI SE.…”

Effective hybridization ofSiO2microsphere and graphene with tannic acid interface modifier for fabrication of multifunctional natural rubber/graphene nanocomposites

“…In recent years a large amount of work have been done to fill the rubber matrix with graphene as a conductive filler 25,26 . In the majority of cases, however, graphene nanomaterials frequently have difficulty in dispersing uniformly in polymer elastomeric matrices to form a continuous electron transport network 27 . Thus far, the structural integrity and electrical permeability of graphene nanofillers with high‐specific surface area to achieve the conductive network of composites at low‐volume fraction has been a challenging and topical issue in this research area.…”