High-temperature infrared-regulating ceramics are essentialfoerxtreme-environmentapplicationsrequiring broadband infrared reflection(1-6μm),such as spacecraft thermal protection,military stealth systems,and related f...High-temperature infrared-regulating ceramics are essentialfoerxtreme-environmentapplicationsrequiring broadband infrared reflection(1-6μm),such as spacecraft thermal protection,military stealth systems,and related fields.Precise control of pore structures is crucial for enhancing ceramic infrared reflectance,as pores directly influence the scattering intensity and scattering path of radiation.However,achieving broadband reflectance above 0.9 remains challenging because of unclear pore-radiation interaction mechanisms and insufficient structural control.This study employs optical simulations to systematically analyze how pore parameters enhance infrared reflectance.The results demonstrate that pore sizes matching the infrared wavelength,highaspect ratios,and aligned orientations synergistically enhance reflection.Guided by simulations,directional pore-structured yttria-stabilized zirconia(YSZ)ceramics were fabricated via a rolling extrusion method using graphite flakes as sacrificial templates.The optimized ceramics exhibited tailored pore parameters(size:0.2-6μm,aspect ratio:3.2-3.9,orientation angle:<30°),achieving exceptional infrared reflectance(>0.9).This study clarifies pore-radiation interactions and presents a scalable strategy to produce advanced thermal shielding materials.展开更多
基金supported by the National Natural Science Foundation of China(No.52371052).
文摘High-temperature infrared-regulating ceramics are essentialfoerxtreme-environmentapplicationsrequiring broadband infrared reflection(1-6μm),such as spacecraft thermal protection,military stealth systems,and related fields.Precise control of pore structures is crucial for enhancing ceramic infrared reflectance,as pores directly influence the scattering intensity and scattering path of radiation.However,achieving broadband reflectance above 0.9 remains challenging because of unclear pore-radiation interaction mechanisms and insufficient structural control.This study employs optical simulations to systematically analyze how pore parameters enhance infrared reflectance.The results demonstrate that pore sizes matching the infrared wavelength,highaspect ratios,and aligned orientations synergistically enhance reflection.Guided by simulations,directional pore-structured yttria-stabilized zirconia(YSZ)ceramics were fabricated via a rolling extrusion method using graphite flakes as sacrificial templates.The optimized ceramics exhibited tailored pore parameters(size:0.2-6μm,aspect ratio:3.2-3.9,orientation angle:<30°),achieving exceptional infrared reflectance(>0.9).This study clarifies pore-radiation interactions and presents a scalable strategy to produce advanced thermal shielding materials.
