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High-temperature thermal shock and material modification: Professor Shen Ping's team at Jilin University proposed an innovative ultrafast pressure sintering (UPS) technology for one-step synthesis and densification of high-entropy carbide ceramics (HECs). This technology combines direct Joule heating, reaction exothermicity and precisely controlled pressure to quickly prepare single-phase HECs at 1800°C, 60 MPa and 3 minutes. 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 material's microstructure. 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: UPS technology achieves efficient preparation of high-entropy carbide ceramics through rapid heating, optimizes its structure and performance, and significantly improves the hardness and uniformity of microstructure. 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: UPS technology can complete the preparation of high-entropy carbide ceramics in a very short time, with high efficiency. FJH technology also greatly shortens the time for material preparation, improves production efficiency, and reduces production costs with its characteristics of rapid heating and cooling. The combination of the two can further improve the efficiency and performance of material preparation, reduce production costs, and provide technical support for the large-scale production of high-performance materials.
Environmental friendliness: UPS 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 high-entropy carbide ceramics treated by UPS technology. Through further rapid heat treatment, the crystal structure and defect distribution of ceramics can be optimized to improve their hardness and stability. For example, more uniform defect distribution and stronger metal-ceramic interaction can be achieved through FJH technology, which can enhance 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 UPS technology to explore and develop new high-entropy ceramic materials. For example, try to use FJH technology to perform rapid heat treatment and structural optimization on other types of high-entropy ceramics or composite materials, and then use UPS technology for synthesis 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 UPS technology in the material preparation process, and 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 high-entropy ceramic materials.
Preparation of high-entropy carbide ceramics: Professor Shen Ping's team at Jilin University achieved rapid preparation of high-entropy carbide ceramics through UPS technology, combined with direct Joule heating and precise pressure control. This method not only significantly shortens the reaction time, but also ensures the composition uniformity and phase purity of the material. This method shows wide application potential in aerospace, high-temperature structural materials, and cutting tools.
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 diboride and boron carbide, which helps to quickly fill the pores between grains and form a low-melting 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: UPS technology significantly reduces the preparation cost and energy consumption of high-entropy carbide ceramics, providing a practical path for large-scale production of high-performance ceramics. In the future, it is expected to be industrially applied in aerospace, high-temperature structural materials, cutting tools and other fields.
Expanding the material system: The UPS process provides a reference for the preparation of a variety of high-performance ceramic materials, 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 UPS 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-entropy ceramics
Electrospinning Nanofibers Article Source:
https://doi.org/10.1016/j.jeurceramsoc.2024.117095
