Abstract: To expand the application of high-entropy spinel infrared radiation coatings in the field of energy saving and emission reduction,high-entropy spinel was prepared by heat treatment at 1 600 ℃ for 8 h with magnesia,alumina,cobalt oxide,nickel oxide,copper oxide and zinc oxide as raw materials,mixed in a stoichiometric ratio of 1∶5∶1∶1∶1∶1.Then it was sprayed on the surface of corundum-mullite small test blocks of 30 mm×30 mm×10 mm to form a high-entropy spinel infrared radiation coating.The effects of different heat treatment temperatures (1 300,1 400,1 500 and 1 600 ℃ for 2 h) on the infrared radiation performance and bonding strength of the coating were investigated.It is found that as the temperature increases from 1 300 to 1 600 ℃,the pores of the coating are gradually reduced,leading to a denser structure.The coating heat treated at 1 600 ℃ for 2 h has the infrared emissivity of 0.86 in the 0.2-2.5 μm band and 0.90 in the 2.5-15 μm band at room temperature.After the heat treatment at 1 500 ℃,the bonding strength between the coating and the substrate is the highest,6.16 MPa.

Key words: high-entropy spinel, infrared radiation coatings, heat treatment temperature, emissivity, bonding strength

摘要： 为拓展高熵尖晶石红外辐射涂层在节能减排领域的应用,首先以氧化镁、氧化铝、氧化钴、氧化镍、氧化铜、氧化锌为原料,按1∶5∶1∶1∶1∶1的化学计量比混合,经1 600 ℃热处理8 h制备高熵尖晶石。然后在30 mm×30 mm×10 mm的刚玉-莫来石小试块表面喷涂高熵尖晶石红外辐射涂层。探究不同热处理温度(1 300、1 400、1 500和1 600 ℃保温2 h)对该涂层的红外辐射性能和结合强度的影响。结果发现:热处理温度由1 300 ℃提高至1 600 ℃时,涂层的孔隙逐渐减少,结构逐渐致密;涂层经1 600 ℃保温2 h后室温下0.2~2.5 μm波段和2.5~15 μm波段的红外发射率分别达到0.86和0.90;当热处理温度为1 500 ℃时,涂层与基体的结合强度最高,达到6.16 MPa。

关键词: 高熵尖晶石, 红外辐射涂层, 热处理温度, 发射率, 结合强度