| The threat of battlefield target is rising with the emergence of various detection equipment of which infrared detection equipment plays the role of pioneer. Infrared detection equipment can detect the targets all days and in different ways. In consideration of those threats, many countries began to study the infrared stealth materials which mainly metal materials and semiconductor oxide materials. With the deepening of the research, infrared stealth composites are appeared. The application of semiconductor oxide materials is much wider than other infrared stealth materials.According to the study of our group before, Al, La doped ZnO and La AlO3 have bright future in infrared stealth field with lower infrared emissivity. As outdoor products, tent is widely used in the military field. It is meaningful to study infrared stealth tent for the promotion of targets viability. Furthermore, the application of infrared stealth materials on tent fabric is seldom reported.Al（5 mol%）, La（2 mol%） doped ZnO was prepared using Zn（C2H3O2）2?2H2O, LaCl3·6H2O,AlCl3·6H2O and C2H7 NO as starting materials. LaAlO3 was prepared through sol-gel method using LaCl3·6H2O and AlCl3·6H2O as starting materials. The two materials were milled into small particles with size about 170 nm. We chose PU-3758 and PVA as adhesives to make infrared stealth coatings. The infrared stealth coatings were coated on tent fabrics layer by layer. They were characterized by X-ray diffraction（XRD）, Scanning Electron Microscopy（SEM）, Fourier Transform Infrared spectrometer（FTIR）, nanoparticle size analyzer, heat conduction coefficient detector, IR-2 dual range infrared emissivity tester.The influences of filler contents and film thickness on the infrared emissivity of coated fabrics were studied in detail. The relationship between heat conduction and infrared emissivitywas also studied. It was found that the infrared emissivity of Al, La doped ZnO coating tent fabrics decreased with the increase of filler content. But when the filler content reached 70 wt.%,the formation of coating was begin hard. The infrared emissivity of coating fabrics was decreased with the increase of film thickness. The hand feeling will be influence badly when the thickness reached 500 μm. The tent fabrics with infrared emissivity between 0.622 and 0.932 can be obtained by changing the filler content and coating thickness. Moreover, we also found that thermal conductivity has the influence on the stealth ability to some extent. The filler content and thickness also have influence on the infrared emissivity of LaAlO3 coated fabrics. The tent fabrics with infrared emissivity between 0.848 and 0.932 can also be obtained by changing the filler content and coating thickness.We studied the camouflage ability of the coating fabrics under different surroundings. It was found that coating fabrics have same infrared emissivity with the surroundings, performing good camouflage ability. The study of the coating tent shows that it has good infrared stealth ability. |
