The research on infrared radiation performance of high-entropy oxides of Lanzhou Chemical Institute has made a series of progress

As a new high-efficiency and energy-saving material, high-temperature infrared radiation coating improves heat transfer efficiency through thermal radiation, and has wide application prospects in thermal power generation, iron and steel, electric power, petrochemical, metallurgical and coking industries. In recent years, high-entropy materials, especially high-entropy oxides, have tunable principal components and unique crystal structures, which have attracted much attention in the research and application of functional materials. However, the study of high-entropy materials in high-temperature infrared radiation has rarely been reported.

Recently, the team of Gao Xianghu, a researcher from the Low Carbon Energy Materials Group of the Clean Energy Chemistry and Materials Laboratory of the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, carried out systematic research on the design and preparation of new high-temperature infrared radiation materials. The paper was published in Advanced Functional Materials.

It is understood that the research team further elucidated the structure-activity relationship between the microstructure, element components, electron distribution and infrared radiation performance of high-entropy oxides through a combination of theory and experiment, and revealed the internal mechanism of high-entropy engineering to improve the infrared radiation performance of materials. The results show that the orbital hybridization generated by the high entropy strategy can effectively enhance the probability of electron transition, and reduce the band gap of the material by introducing a large number of oxygen vacancies through variable valence metal elements. In addition, the lattice distortion effect reduces the symmetry of lattice vibrations. Therefore, (MnCrFeCoCu)3O4 high-entropy spinel oxide has excellent near-blackbody radiation ability. After annealing heat treatment at 1300°C for 100h, the material still maintains a single-phase spinel structure, and the infrared radiation attenuation rate is only 2.1%.

In addition, the researchers used cold spraying technology to deposit high-entropy oxide infrared radiation materials on stainless steel substrates, the infrared radiation coating has high radiant thermal efficiency and significant thermal stability, infrared emissivity can reach 0.943 in the 0.78-16μm band, this new high-entropy infrared radiation material has great application potential in the field of high-temperature industrial thermal radiation.

Verification of radiative heat transfer performance of high-entropy oxide infrared radiation materials. Photo courtesy of Lanzhou Chemical Institute.

(Source: Ye Manshan, China Science News)

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