Authors: N.I. Fedorova, O.M. Gavrilyuk, V.Y. Malysheva

Title of the article: Determination of the wettability of carbonaceous materials by coal pitch

Year: 2025, Issue: 1, Pages: 87-93

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 662.749.39

DOI: 10.26730/1999-4125-2025-1-87-93

Abstract: Currently, carbon materials (carbon fibers, carbon structural materials, electrodes, etc.) are made from a mixture of carbon filler and binder. To a large extent, the quality of the finished mixture is determined by the phenomena occurring on the surface of carbonaceous materials during their interaction with coal tar. Along with the influence of other factors, the necessary contact of the binder and solid carbonaceous materials is possible provided that the solid phase is wetted with sufficiently softened pitch. Therefore, the study of the wetting ability of binders of coke fillers is necessary and relevant. The paper presents the results of experimental determination of the angle of wetting of the surface of carbonaceous materials used as coke fillers with coal pitch. The wettability of the surface was determined by medium-temperature baking for the following carbonaceous materials: petroleum coke, artificial graphite and high-temperature coke obtained at 900oC from brown coal. Quantitatively, the degree of wettability was characterized by the marginal angle of static wetting by the "lying" drop method in the temperature range 60-160 °C, measurements were made every 10 ° C. The temperature dependence of the wettability of the tested carbonaceous materials by coal pitch has been studied. It was determined that the pitch does not wet the samples at a temperature close to its softening temperature. Wetting of the surface begins when the value of the edge angle θ = 90 ° is reached in the temperature range 92-100 °C. The totality of the data obtained made it possible to establish that petroleum coke and artificial graphite have the best wettability. High-temperature coke is characterized by the lowest wettability, since in the studied temperature range the wetting edge angle was always greater than 90 °. The results obtained are important because they allow us to get a more complete picture of the technological value of the studied samples as raw materials for the production of composite carbon materials.

Key words: carbon materials coal pitch wetting angle softening temperature petroleum coke coal coke graphite

Receiving date: 30.09.2024

Approval date: 22.01.2025

Publication date: 12.03.2025

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