High Al content AlTiN were deposited on YG6 (WC+ 6 wt-%Co) cemented carbide by cathodic arc evaporation technique. The tribological properties were investigated up to 700°C at a high speed of 100 m min⁻¹. The results showed that the friction coefficient of the coating decreased with the increase of temperature apparently. The wear rate of room temperature was higher than that of 200 and 400°C, but showed ‘negative’ value at temperature over 500°C. The wear mechanism of the AlTiN coating at temperature less than 400°C was primary abrasive wear, while oxidation and adherence were suggested to be the main wear mechanisms at elevated temperature over 500°C. By comparison, adhesive wear was more predominant in the friction, the contribution of adhesive wear was more than that of abrasive wear at elevated temperatures.

In order to optimize the phase-change energy storage materials for asphalt pavement and analyze the feasibility and applicability of phase-change energy storage materials for asphalt pavement, the experimental methods of thermogravimetric analysis (TG) and Fourier infrared spectroscopy (FT-IR) were adopted. The thermal stability, chemical stability and chemical compatibility of various phase change energy storage materials were tested and analyzed. The results show that the fatty acids, stearic acids and fatty alcohols showed significant weight loss at 200°C. PEG and DTC phase change materials showed no mass loss at 200°C and had good thermal stability. PEG2000 and DTC have no chemical changes after high temperature treatment, and PEG2000, DTC and SBS modified asphalt are physical blend, and the chemical compatibility with asphalt is good. Crystalline hydrated salts, paraffin, fatty acid, stearic acid, fatty alcohol phase change materials are not suitable for asphalt pavement, PEG organic phase change materials and DTC composite phase change materials can be used for intelligent temperature control asphalt pavement research.

To investigate the effects of friction surface and electrochemical properties on the tribological behavior of TiAlSiN coatings in seawater, the tribological properties of TiAlSiN coatings in air and seawater are comparatively studied using a ball-on-disk tribometer with Si₃N₄ ceramic balls as the counter material. The results show that under both friction conditions, the wear rate of TiAlSiN coating is decreased compared with 316 l steel substrate, and the coating presents a good protective effect. When friction occurs in air, the abrasive debris in the wear area cannot be discharged in time, resulting in the accumulation of abrasive debris and accelerating the wear of the coating. When friction occurs in seawater, although seawater is corrosive, the lubricating barrier surface formed by the friction oxide during the friction process significantly reduces the wear rate of the coating. In addition, the excellent electrochemical properties and the dense coating microstructure improve the tribocorrosion resistance of the TiAlSiN coating in seawater. It proves that friction surface has a great impact on the tribological performance of TiAlSiN coatings, and how to form a more favorable friction layer in the tribochemical environment is worthy of further research in the field of marine equipment.

To reveal the wear mechanisms of TiAlN, TiAlSiN, and CrAlN coatings in a seawater environment, the changes in frictional surfaces and the electrochemical characteristics of these coatings were compared and analyzed in this paper. The coatings were deposited on 316L stainless steel surfaces. Tribological tests were investigated using a ball-on-disk tribometer with Si₃N₄ ceramic balls as the counter material. Although the friction coefficient of 316L stainless steel was the lowest at 0.34, the order of wear rates was 316L stainless steel (7.38 × 10⁻⁵) > TiAlN(5.31 × 10⁻⁶) > TiAlSiN(4.23 × 10⁻⁶) > CrAlN(1.10 × 10⁻⁶) and the electrochemical protective efficiencies of TiAlSiN and CrAlN were both greater than 97%. Seawater penetrated through the grain boundaries of the TiAlN coating, which led to corrosion and delamination failure. Conversely, the grain refinement in TiAlSiN and CrAlN coatings can significantly slow down the penetration of seawater into the coating under frictional pressure, and the oxide lubricating layer formed during the friction process can become an effective barrier to isolate seawater. Therefore, mechanical wear was the main wear form of these two coatings. Additionally, among the oxides formed in the friction, Cr₂O₃ showed the strongest corrosion resistance, making the CrAlN coating exhibit superior wear resistance and the lowest wear rate in seawater.

The main content of this paper is how to carry out curriculum teaching reform in the perspective of promoting students' development. By giving full play to the breakthrough role of the classroom, taking the academic evaluation of the whole process as the starting point, the course content is reconstructed from the perspective of majors and curriculum system, several optimized classroom teaching strategies are given, and the teaching design of the integration of learning evaluation is carried out. In order to encourage students to actively participate in the classroom, several efficient classroom teaching methods have been provided. In order to leverage the motivating role of evaluation in teaching, an integrated design of teaching evaluation was carried out, and specific integration ideas were provided. The method adopted in this article has universality from content reconstruction to teaching implementation, providing a reference paradigm for classroom teaching reform in other courses.