Publication Date:
2018-02-07
Description:
Graphitic carbon spheres (GCS) with an average diameter of about 0.8 μm were prepared via hydrothermal carbonization combined with catalytic graphitization using glucose and in-situ formed Fe nanoparticles (NPs) as respectively a carbon precursor and catalyst. They were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and thermogravimetric analysis/differential scanning calorimetry (TG/DSC). The optimal content of Fe catalyst for graphitization of amorphous CS was found to be 1.0 wt%, and the optimal temperature and soaking time were respectively 1473 K and 3 h. The transformation from CS to GCS was considered to be dominated by the “dissolution-precipitation” mechanism. Using as-prepared GCS instead of flake graphite (FG) as a carbon source, not only reduced water demand for casting Al 2 O 3 -SiC-C samples and decreased their final apparent porosity, but also enhanced their modulus of rupture and cold crushing strength. In addition, castable samples using GCS showed better oxidation resistance than those using FG. This article is protected by copyright. All rights reserved.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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