Enhanced electrical property of graphite/Al2O3 composite fabricated by reductive sintering of gel-casted body using cross-linked epoxy polymer

Abstract

In the present study, graphite/alumina composites are fabricated via reductive sintering of gel-casted green bodies with structurally controlled cross-linked epoxy polymers for the first time. The cross-linking degrees of polymers are tuned by the amount ratio of epoxy monomer/polyvinyl alcohol cross-linker utilized in gel-casting process. Superior electrical properties with respect to 5-fold enhanced electrical conductivity and 2-fold higher carrier mobility are successfully achieved in graphite/alumina composite fabricated from cross-linked epoxy polymer, whose phenomenon is attributed to the excellent conductive path in ceramic matrix established by highly uniform network with improved graphitization degree.

Synthesis and adsorption performance of fly ash/steel slag‐based geopolymer for removal of Cu (II) and methylene blue

“…The FT‐IR spectra of the raw powders and the synthesized geopolymer were shown in Figure 3. The absorption vibration peaks of steel slag powders at 3401 and 1641 cm −1 were related to the stretching and bending vibrations of ‐OH and H‐O‐H in water, respectively 24,25 . Similarly, synthetic geopolymer also had these vibration peaks of ‐OH and H‐O‐H at 3514 and 1650 cm −1 , respectively.…”

“…The absorption vibration peaks of steel slag powders at 3401 and 1641 cm −1 were related to the stretching and bending vibrations of -OH and H-O-H in water, respectively. 24,25 Similarly, synthetic geopolymer also had these vibration peaks of -OH and H-O-H at 3514 and 1650 cm −1 , respectively. The peak at 1410 cm −1 belonged to the characteristic peak of CO 2 , which proved the presence of a little carbonate on the geopolymer surface.…”

SiC skeleton‐reinforced highly oriented graphite with good thermophysical and electromagnetic shielding properties

“…Graphite materials have attracted considerable attention as promising candidates for TMMs because of their outstanding in‐plane thermal conductivity (TC) 3 . Highly oriented graphite‐based multifunctional materials with desirable TC have been extensively explored 2,4–7 .…”

“…Graphite materials have attracted considerable attention as promising candidates for TMMs because of their outstanding in-plane thermal conductivity (TC). 3 Highly oriented graphite-based multifunctional materials with desirable TC have been extensively explored. 2,4-7 Yuan et al prepared graphite blocks with a high TC of ∼500 W/m/K by hot pressing at 2 800 • C, where the oriented laminar structure perpendicular to the pressing direction was highly graphitized.…”

Self-Toughening and Interfacial Welding of Covalent Adaptable Networks Undergoing Hydro-Chemo-Mechanical Coupling

“…Epoxy polymers are one of the most commonly used materials for high-performance engineering applications. − However, most of them are chemically crosslinked and cannot be easily recycled using conventional techniques, leading to severe environmental pollution and resource wastage. , CANs have recently been incorporated into the thermosetting epoxy polymers to achieve their self-healing and recycling capabilities using BERs and form new generations of green materials, which can be fully recycled and reprocessed without causing environmental pollution …”