| Electrodeposit technology is more and more popular today because excellent performance layer can be made on the surface of inferior material by this technology, which can save costly alloy and rare metal as well as energy. At the same time, rare earth is good at surface modification. Taking advantage of both rare earth and electrodeposit, we can remarkably improve the surface performance of metal material.In this paper, the wear resistance of electrodeposit TiC ceramic coating containing La2O3 on steel 45 substrate was studied, and the influence of La2O3 on wear resistance of ceramic coating was analyzed. In this paper, we also study the technics characteristic of electrodeposit, such as the proportion of different powders, how to get the electrode and the parameter of discharge. This experiment was performed using TiC, WC, Ni and Mo powders on steel 45 substrate. Wear tests were done for layers containing different rate of La2O3 The results show that the wear resistance of ceramic coating containing a certain mount of La2O3 is remarkably improved. At this experiment condition, the best content is 0.5%, and the wear resistance is improved by 71.4 %. But it declines distinctly when the content of La2O3 exceeds the ideal amount and even worse than the coatings that don' t containLa2O3, it decreases 28.6% when La2O3 reach 4%. By analytical scanning electron microscope (ASEM) and X-Ray diffraction (XRD), it is shows that TiC phase structure of the coating containing 0.5% La2O3 is remarkably refined.The research results of this paper shows that high surface quality layer which is make up of TiC powder can be gained under a proper energy density of discharge. Proper amount of La2O3 additive can gets rid of oxygen, sulfur and other impurity, remarkably fine TiC grain, which will improve the wear resistance of the coating. Otherwise, when the contain of La2O3 exceed the ideal amount, the wear resistance of layer will reduced for forming a mass of La2Fe17.
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