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High Temperature Thermal Shock and Densification: Jaehun Cho's team used Ultrafast High Temperature Sintering (UHS) to achieve short-term high densification of Aluminum Nitride (AlN) ceramics without applied pressure by rapidly increasing the temperature (10⁴-10⁵°C/min).Flash Joule The Flash Joule Heating Machine (FJH) technology also rapidly heats the material to high temperatures, triggering the reorganization and densification of the internal structure of the material and the precise control of the microstructure of the material. Both take advantage of the intense reaction conditions brought about by high-temperature thermal shock to promote efficient densification of the target material.
Rapid heating and property optimization: UHS technology achieves efficient sintering of AlN ceramics through rapid heating, optimizing their microstructure and mechanical properties, and significantly improving properties such as relative density, Vickers hardness, and fracture toughness etc. FJH technology is also commonly used for rapid heating and property optimization in the preparation of other materials, for example, in the preparation of carbon-based materials, such as graphene, rapid heating can modulate the material's defects density and electronic structure, thus optimizing its electrical conductivity and chemical activity.
High efficiency and low cost: UHS technology can complete the sintering of AlN ceramics in a very short time with high efficiency, while FJH technology, also characterized by its rapid heating and cooling, dramatically shortens the time of material preparation, improves the production efficiency and reduces the production cost. The combination of the two can further enhance the efficiency and performance of material preparation, reduce production costs, and provide technical support for the large-scale production of high-performance ceramic materials.
Environmental friendliness: UHS technology avoids the long time energy consumption and environmental pollution problems in the traditional high temperature sintering process.FJH technology does not require the use of solvents or reaction gases during material synthesis and has low energy consumption, which is in line with the current requirements of environmental protection and sustainable development.
Further optimization of material properties: FJH technology can be applied to the subsequent treatment of AlN ceramics treated by UHS technology to optimize the crystal structure and defect distribution of the ceramics, and improve their mechanical properties and thermal stability through further rapid heat treatment. For example, more uniform defect distribution and stronger metal-ceramic interactions are achieved by FJH technology, enhancing the sintering resistance and long-term stability of the ceramics.
Development of new ceramic materials: Combine the rapid synthesis capability of FJH technology and the densification advantage of UHS technology to explore the development of new ceramic materials. For example, try to put other types of non-oxide ceramics or composite materials through the FJH technology for rapid heat treatment and structure optimization, and then use the UHS technology for densification to achieve higher performance and better application effects.
Optimization and standardization of process parameters: In-depth study of the synergistic mechanism between FJH technology and UHS technology in the material preparation process, optimization of process parameters, such as heating temperature, heating time, current density, and so on. Establish a standardized process flow to ensure the stability and consistency of material properties, and provide a reliable technical guarantee for the commercial production and application of ceramic materials.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1016/j.jeurceramsoc.2024.117025
