Graded epoxy-hard coal composites: Analysis of filler particle distribution in the epoxy matrix

Abstract

The aim of the work was to achieve assumed gradation of hard coal particles distribution in epoxy matrix and thus gradation of properties. It was done by proper selection of compounds composition and conditions of the gradation formation. The graded composites were produced using centrifugal casting. Two types of epoxy resins as a matrix and two types of hard coal of various granulation as a filler were used. Samples in the form of bushings with radial carbon filler gradation were produced by changing filler type, its volumetric content and parameters of centrifugal casting. The first part of the paper presents results of graded materials structure investigations. The microscopic observations of the structure of composites prepared according to elaborated experimental program show that the composites are characterized by continuous change of the filler particles content in radial direction, so they can be classified as graded materials. Results also show that gradation of particles content and thus gradation of properties may be planned and foreseen when mechanisms of gradation formation are known.

Manufacturing and Characterization of Green Composites with Partially Biobased Epoxy Resin and Flaxseed Flour Wastes

“…Kumar et al [51] reported manufacturing by casting and characterization of epoxy composites with up to 12.5 wt% wood particles. Centrifugal casting is a way to obtain gradation of the filler due to centrifugal forces as reported by Stabik et al [52]. They report that as well as the particle gradation occurs, gradation of properties occurs too which could be interesting from different standpoints (decorative, percolation thresholds in some parts, and so on.…”

Influence of Citrus Fruit Waste Filler on the Physical Properties of Silicone-Based Composites

“…In recent years, composite materials have gained popularity due to their many advantages, such as their low density and the ease and economy of their production [1][2][3]. Polymer-based composite materials are defined as materials in which the matrix is a polymer material, and the filler is made of organic or inorganic particles that are immiscible with the polymer [4][5][6][7]. Researchers around the world have taken steps to improve the operational properties of this group of materials by using various types of reinforcements, e.g., fibers [8][9][10][11].…”