| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 98 === In this treatise, different ceramic powders, carbide (SiC, WC), boride (WB, TiB2) and nitride (TiN) were clad on Ti-6Al-4V by gas tungsten arc welding (GTAW) method. On the one hand clad layer was to improve surface wear resistance of Ti-6Al-4V, and on the other hand study wear behaviors of clad layer affected by microstructure, reinforcement form and wear resistance of different ceramic clad layer. From the morphology of this microstructure and the related analysis results, a reasonable hypothesis for the evolution of this microstructure formation processes is proposed as following.
To synthesize the results, the hardness and wear resistance of the clad layer were higher than the substrate conspicuous. The reinforcement arrange, growth direction and geometric were very important and influence the wear performance of the clad layer. Therefore, the SiC clad layer has the best wear resistant and the TiB2 clad layer has the worst wear resistant. It was due to the reinforcements arrange complicate, mechanical locking effect of reinforcements and the reinforcements has the high bond with the clad layer.
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