Journal
SURFACE & COATINGS TECHNOLOGY
Volume 408, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.126860
Keywords
Thermal spraying; Fe-based coating; Carbon nanotube; TiB2; Wear resistance
Funding
- National Natural Science Foundation of China [51901079]
- Fundamental Research Funds for the Central Universities
- Opening Project of National Engineering Research Center for Powder Metallurgy of Titanium Rare Metals
- Natural Science Foundation of Guangdong Province [2018A030313615, 2018A030310406, 2020A1515010736]
- Guangzhou Municipal Science and Technology Program [202007020008]
- Zhongshan Municipal Science and Technology Program (Platform Construction and innovation Team) [2016F2FC0005]
- Zhongshan Collaborative Innovation Fund [2018C1001]
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The study found that adding 2.5% CNTs to the Fe-TiB2 cermet coating can significantly improve its microstructure density, microhardness, and fracture toughness, resulting in better wear resistance.
Carbon nanotubes (CNTs) with superior properties were introduced for the first time into Fe-TiB2 cermet coating to strengthen its wear resistance. Initially, composite feedstock in which every powder was not only highly spherical and dense but also contained uniform CNTs and TiB2 were successfully prepared. Then, Fe-based metallic and Fe-TiB2 cermet coating with or without CNTs were deposited via high velocity air fuel (HVAF) to mainly investigate the effect of CNT addition on the microstructure and wear behavior of coatings. It shows that, with incorporation of 2.5 vol% CNTs, the coating microstructure became denser and the microhardness and fracture toughness of Fe-TiB2 cermet coating obtain increases of 32% and 44% (or 61%). As a result, the improved tribological properties, the lowest porosity and fewest wear crack contribute to its best wear resistance with specific wear rate of 2.47 x 10(-6) mm(3)/N.m. Oxidative and mild abrasive wears rather than severe adhesive wear were the dominant wear mechanism of coating reinforced by CNTs.
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