Invited Speaker
Prof. Hongbo Ju
School of Materials Science and Engineering, Jiangsu University of Science and technology
E-mail: hbju@just.edu.cn
Title:
Preparation of MAX phase reinforced NiCrAlY coating and its high temperature wear and corrosion properties
Profile:
Hongbo Ju is a full professor at Jiangsu University of Science and Technology and Marie-Curie-Research-Fellow from Marie Skłodowska-Curie actions (MSCA) with a number of MSCA-COFUND-5100-237/2023-9. His research interests include thin solid coatings (PVDs), superhard nitride coatings, oxidation resistance, and self-lubrication and wear resistance coatings suitable for hightemperature applications. He published more than 100 papers in international peer review, with H-index of 25.
Abstract:
The world is warming and the weather is becoming increasingly unstable and extreme, and the overwhelming scientific consensus is that mankind’s use of fossil fuels and derivates is a key component in this climate change. Friction, wear and lubrication are major players in the consumption of energy and, so, reducing friction and wear and using green lubrication is the most direct route to decrease the energy consumption and pollution. The scientific community has developed different types of coatings based on different adaptive mechanisms, through incorporation of self-lubricant agents into the ceramic-based matrix, aiming not only to reduce friction and wear but they can also increase the lifespan of coated components. However, when parts are exposed to high temperature conditions, premature failure of the components occur due to mechanical performance degradation, low oxidation resistance of the coatings and/or fast/total diffusion of the lubricious element to the surface.
The objective of our recent research was to develop a universal coating system, designed to provide low friction and green-tribology solutions for real applications where harsh conditions at elevated temperatures exist that will alleviate the reliance on harmful oils and dramatically reduce the energy consumption and its effects on climate change and pollution. To achieve such an effect, the novel multilayered self-lubricant architecture of Mo2N-SiNx/Ag-SiNx, Mo2N-Ag/SiNx and Mo2N/Ag-SiNx systems, combining the excellent performances of self-lubricant, high hardness and slow-release of lubricant agents, was designed and synthesized using magnetron sputtering, and the tribological behaviors at the wide range of temperature, including the diffusion of lubricant agents, the formation and transformation of in-situ tribo-phases, as well as the evolution of the interfaces, were systematically investigated for different temperatures to design coatings with, optimized structure and architecture.