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Pictured at the top left: Combustion synthesis of Cu2SnSe3 thermoelectric material, with a ZT value of 1.4, is the highest level reported so far for Cu2SnSe3. Bottom left: FeSe1-xTex iron-based superconducting material prepared by combustion synthesis. The superconducting transition temperature is 14 K @ the critical magnetic field strength 54 T. Top right: Combustion synthesis of graphene, which is a super capacitor made of electrodes, can light 200 LED lights at the same time. Bottom right: large-scale combustion synthesis equipment, two types of achievable combustion reactions, and two monographs that were invited to be written.
Combustion synthesis, as a new material preparation technology, has attracted extensive attention from the international material community because of its simple process, short preparation cycle, near zero energy consumption, and green preparation, and it has continued to develop rapidly over the past two decades.
Under the strong support of the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Chinese Academy of Sciences, researchers from the Functional Ceramics Research Group of the Institute of Physics and Chemistry, Chinese Academy of Sciences Physics and Technology Institute of Low Temperature Materials and Applied Superconductivity Research Institute are combusting and synthesizing thermoelectric, superconducting, infrared and nitride materials. Ceramics and other aspects have made a series of progress. Researchers have mastered key techniques for the reaction synthesis that can still achieve self-propagating combustion mode under low temperature and low pressure conditions (Adv. Fun. Mater. 2016, 26, 6025; Acta. Mater. 2017, 122, 187; J. Eur. Ceram. Soc. 2016, 36, 1407). Using the unique non-equilibrium reaction conditions of combustion synthesis, a compact one-step Cu2SnSe3 thermoelectric material can be directly synthesized without sintering, and the thermoelectricity value at 823K can reach 1.4 with the two-position co-doping method of Ag and In. The highest international level. FeSe1-xTex iron-based superconducting materials were prepared by combustion synthesis, and the reaction mechanism of Fe-Se(Te) solid-liquid system was revealed through quenching experiments, which provided theoretical guidance for the optimization of the synthesis process of FeSe1-xTex materials. In cooperation with researcher Ma Yanwei of the Institute of Electrical Engineering of the Chinese Academy of Sciences, the graphene produced by combustion synthesis was made into a high-performance supercapacitor with a specific capacitance of up to 244 F/g, an energy density of up to 136 Wh/kg, and a power density of up to 1000 kW/kg. Cycle 100 Ten thousand weeks later, the capacity retention rate is still greater than 90%, and 200 LED lamps can be lighted at the same time (Adv. Mater. 2017, 1604690), demonstrating the prospect of low-cost preparation of graphene that can be used for supercapacitors.
In the field of combustion synthesis industrialization, it has been successfully developed for the first time in the world to combust and synthesize high-quality silicon nitride powders in large-scale low-pressure reactors, with a single-kettle synthesis capacity of 25 kg, which is lower than the output of single-kettles of international peer companies (≤5 kg/ The reactor is more than 5 times higher; the self-developed reactor with a capacity of 0.8m3 is the largest volume of high pressure combustion synthesis equipment reported. Alymov, director of the Institute of Macrodynamics of Materials and Structures of the Russian Academy of Sciences, highly appraised and paid attention to this achievement. Since 2014, he has sent his assistant Smirnov to visit and cooperate twice. He personally came to physics and chemistry to conduct cooperative research, and in 2016, During the EPNM international conference in the year, the physics and chemistry institute personnel carried out in-depth discussions on combustion synthesis technology. The above results show that the engineering and scale of the combustion synthetic ceramic powder materials at the physical and chemical sites are at the leading international level. Liu Guanghua, winner of the National Natural Science Outstanding Youth Fund, systematically summarized the laws of gas-solid combustion synthesis of advanced ceramic materials, and applied for four national invention patents. He was also invited to participate in two monographs on combustion synthesis in English. Published by technology publishers Wiley-VCH and Bentham.
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