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High-temperature thermal shock and material modification: Associate Professor Yang Zhengbao's team proposed a programmable ceramic shaping and sintering (USS) process based on Joule heat, which shapes ceramic green bodies in the temperature range of 1220K to 1370K through carbon felt Joule heating, and performs rapid sintering at 1520K for about 10 seconds. Flash Joule Heating Machine (FJH) technology can also quickly heat materials to high temperatures, triggering the reorganization of the internal structure of the material and the formation of defects, and achieve precise control of the microstructure of the material. Both use the violent reaction conditions brought about by high-temperature thermal shock to promote efficient modification of the target material.
Rapid heating and performance optimization: USS technology achieves efficient shaping and sintering of ceramics through rapid heating, optimizes its structure and performance, and significantly improves its mechanical strength and piezoelectric properties. FJH technology is also commonly used for rapid heating and performance optimization in the preparation of other materials. For example, in the preparation of carbon-based materials such as graphene, the defect density and electronic structure of the material can be regulated by rapid heating, thereby optimizing its conductivity and chemical activity.
High efficiency and low cost: USS technology can complete the shaping and sintering of ceramics in a very short time, which is highly efficient. FJH technology also has the characteristics of rapid heating and cooling, which greatly shortens the time of material preparation, improves production efficiency and reduces production costs. The combination of the two can further improve the efficiency and performance of material preparation, reduce production costs, and provide technical support for large-scale production of high-performance materials.
Environmental friendliness: USS technology avoids the long-term energy consumption and environmental pollution problems in traditional high-temperature treatment. FJH technology does not require the use of solvents or reaction gases during material synthesis, and has low energy consumption, which meets the current requirements of environmental protection and sustainable development.
Further optimization of material properties: FJH technology can be applied to the subsequent treatment of ceramics treated by USS technology. Through further rapid heat treatment, the crystal structure and defect distribution of ceramics can be optimized to improve their mechanical strength and piezoelectric properties. For example, more uniform defect distribution and stronger metal-ceramic interaction can be achieved through FJH technology, enhancing the sintering resistance and long-term stability of ceramics.
Development of new materials: Combine the rapid synthesis capability of FJH technology and the structural regulation advantage of USS technology to explore and develop new ceramic materials. For example, try to use FJH technology to quickly heat treat and optimize the structure of other types of ceramics or composite materials, and then use USS technology for shaping and sintering to achieve higher performance and better application effects.
Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology and USS technology in the material preparation process, optimize process parameters such as heating temperature, heating time, current density, etc. Establish a standardized process flow to ensure the stability and consistency of material performance, and provide reliable technical guarantees for the commercial production and application of ceramic materials.
Preparation of complex-shaped ceramics: The team of Associate Professor Yang Zhengbao of the Hong Kong University of Science and Technology successfully prepared ceramics with a variety of complex geometric shapes, including twisted shapes, arched shapes, and structures with micro-patterns through USS technology. These ceramic materials show good mechanical strength, piezoelectric properties and geometric stability, providing technical support for practical applications.
Rapid liquid phase assisted ultra-high temperature sintering: ScienceNet reported a rapid liquid phase assisted ultra-high temperature sintering method that can achieve effective densification without completely melting the material and maintain the uniformity of the high entropy structure. By rapidly heating to a temperature of 3000 K, a eutectic liquid phase is formed between high entropy metal diborides and boron carbides, which helps to quickly fill the pores between grains and form a low melting point dodecaboride phase. This method is not only suitable for densification of composite materials, but can also be used to prepare thin films and coatings, showing a wide range of application potential.
Technology Promotion and Large-Scale Production: USS technology significantly reduces the preparation cost and energy consumption of ceramics, providing a practical path for large-scale production of high-performance ceramics. In the future, it is expected to be industrialized in the fields of electronics, energy, and biomedicine.
Expanding the material system: The USS process provides a reference for the preparation of a variety of high-performance ceramics, such as high entropy nitrides, borides, and multi-component composite materials. These new materials can further meet the needs of different industrial fields.
In-depth research and process optimization: Subsequent research can focus on the in-depth analysis of the reaction mechanism and microstructure evolution during the USS process, while optimizing equipment and process parameters to improve the consistency and stability of material performance, laying the foundation for further promoting the application of high-performance ceramics
Electrospinning Nanofibers Article Source:
https://doi.org/10.1038/s41467-024-54393-w
