Production of Ni-Co-bronze composites with different TiC composition by hot pressing

Abstract

Improving microstructural, mechanical, and thermal properties of Ni-Co-Bronze composites is crucial for various applications. In this study, five Ni-Co-Bronze (CuSn)+XTiC (0, 3, 7, 10, and 15 wt.%) composites were produced by using the hot pressing method. The effect of TiC reinforcement rate on each of their microstructure, wear, hardness, and thermal properties was investigated. Within the scope of microstructure analysis, the scanning electron microscope (SEM), electron dispersive spectrometer (EDS), and XRD analysis were employed. Thermal analyses were carried out for thermal differences between the samples. Furthermore, microhardness, impact, and wear tests were run to estimate mechanical behaviors of Ni-Co Bronze+XTiC composite. Experimental results indicated that TiC rate had an important effect on the microstructure, wear-resistance and microhardness of Ni-Co bronze composite. As the TiC reinforcement rate increased, the hardness of Ni-Co Bronze+XTiC composites varied between 180 HV and 450 HV. Consequently, microstructure analysis revealed that there was a serious interaction between reinforcement and matrix. Wear resistance increased with a TiC (7-10) wt.% rate but decreased at high TiC rates. It was clearly seen that the wear pattern was both oxidative and abrasive.

Keywords

• ni-co bronze + xtic composites
• hot pressing
• thermal analysis
• impact toughness
• worn surface analysis.