Development of a method for siliconizing high-density graphite of the MPG grade

Рассмотрен способ силицирования высокоплотного графита марки МПГ; показано, что процесс силицирования протекает на всю глубину заготовки и кремний равномерно распределяется по объему поры, при этом карбид кремния распределяется по поверхности, в то время как кремний остается в остальном объеме поры; исследованы физико-механические характеристики и фазовый состав графита после силицирования; показано, что такой силицированный графит возможно использовать в качестве нагревателей вакуумных печей, а также в химических источников тока. A method of siliconizing high-density graphite of the MPG grade is considered; it is shown that the siliconizing process proceeds to the entire depth of the workpiece and silicon is evenly distributed over the pore volume, while silicon carbide is distributed over the surface, while silicon remains in the rest of the pore volume; investigated the physical and mechanical characteristics and phase composition of graphite after siliconizing; it is shown that such siliconized graphite can be used as heaters for vacuum furnaces, as well as in chemical current sources.

Homely prepared carbon-based Fe-doped catalysts for electro-fenton degradation of azo dyes

Compounds used in the fashion industry affect the water bodies in the vicinity of textile factories, resulting in the visible coloration of surface water. Fe-doped graphite-based homely prepared electrodes were involved in Reactive Blue 52 (RB52) Fenton-like degradation. The electrodes consisted of high-density graphite in three granulation sizes and three levels of Fe content were characterized using scanning electron microscopy (SEM). The amount of Fe in electrodes and H2O2 concentration in synthetic textile wastewater were optimized. Additionally, the size of graphite grains was varied to investigate whether it affects the degradation rate. Under only 10 minutes of electro-Fenton degradation, a system with 10 mmol dm-3 of H2O2 and an electrode made of 7 % of Fe and 70 ?m of granulation size of graphite, degraded over 75 % of RB52, and over 99 % after 40 minutes of treatment. Obtained results indicate that the proposed approach can be beneficial in the field of novel materials for environmental application and that homely prepared carbon can be an excellent replacement for commercially available supports.

In situtunable pillaring of compact and high-density graphite fluoride with pseudocapacitive diamines for supercapacitors with combined predominance in gravimetric and volumetric performances

Graphene electrodes with ultrahigh volumetric & gravimetric capacitances were prepared through pillaring fluorographite sheets with pseudocapacitive diamines.