Abstract
The method of electrical discharge coating with TiC4 ceramic layer in an ordinary electrical discharge machining (EDM) tool was studied. TiC4 ceramic layer was deposited on No. 45 carbon steel substrate by EDM technique. TiC4 ceramic coatings with different contents of lanthanum oxide were fabricated on No. 45 carbon steel substrate. The microstructures of the clad coatings were examined and tested for chemical composition, phase structure, friction and wear properties. Scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, hardness testing, block on ring friction and wear testing were carried out separately. Experimental results show that TiC4 ceramic coating can be deposited on a substrate of carbon steel, and the electrode doped with rare earth lanthanum oxide helps to refine coating's microstructure and enhance the coating's density. When the content of lanthanum oxide is increased to 0˙5%, the clad coating shows the best antiwear ability, wear resistance can be increased by three times and the friction coefficient can be decreased by 10%. If the content of lanthanum oxide exceeds that proportion, the coating's wear resistance decreases significantly.
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