Abstract
In this chapter, firstly, a comprehensive review of electrical discharge coating (EDC) was made to identify a new research area, then the EDC technique with quarry dust powder suspension on tungsten carbide cobalt was introduced. The effects of quarry dust suspension on the coated surface characteristics and tribological properties were investigated. By using EDC with quarry dust suspension, a layer of coating consisting of hard carbides (SiC, Mg2C3, Fe2C, and CaC2) and oxide phases (SiO2, Al2O3, Fe2O3, CaO, CoO, and ZnO) due to material migration was confirmed, and the coating layer thickness was greatly influenced by quarry dust concentration. Under coating conditions of 5 A of peak current (Ip) and 300 μs of pulse on time (Ton), the Vickers microhardness increased by 28%, while the surface roughness, coefficient of friction, and wear scar depth of the coating layer decreased by 29%, 61%, and 63%, respectively, when compared with the original substrate.
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