期刊
COMPOSITES COMMUNICATIONS
卷 10, 期 -, 页码 57-63出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2018.06.008
关键词
Metal-matrix composites (MMCs); Titanium; Nanodiamonds; Tribological properties
资金
- Natural Science Foundation of Jiangsu Province [BK20161419]
- National Natural Science Foundation of China [U1737103]
- Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure at SICCAS [SKL201603SIC]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars at State Education Ministry [2015-1098]
- Jiangsu Key Laboratory for Advanced Metallic Materials at Southeast University [BM2007204]
- Fundamental Research Funds for the Central Universities [2242017K40183]
Ti-based composites are finding ever-increasing applications as biomaterials because of their excellent performance. For this research, an attempt has been made to study the tribological, thermal and corrosion properties of Ti/nanodiamonds (NDs) nanocomposites. The powder mixtures were consolidated by spark plasma sintering process. Microstructure and composition of the samples were investigated by transmission electron microscopy and X-ray diffraction techniques. Based on the tribological results, wear rate decreased significantly with increasing NDs, especially at a load of 200 N. This was attributed to the strengthening of the nanocomposites by ND reinforcements. Wear mechanism is considered to be micro-ploughing and delamination for pure Ti as well as abrasive and adhesive wear for the Ti/NDs nanocomposites. In addition, thermal conductivity of the composites was evaluated as a function of ND amounts, showing reduction of the thermal properties with increasing the nano-reinforcements. According to the corrosion test results, corrosion resistance of the samples increases with increasing nano-reinforcement up to 0.25 wtWo NDs and thereafter decreases. Therefore, there was an optimum for the amount of NDs in which the corrosion resistance of the Ti/NDs nanocomposite is at the highest level. Furthermore, it was deduced that micro-galvanic corrosion is the most predominant mechanism for this system.
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