Preparation and Multiple-band Stealth Properties of Al/Cr2O3 Composite Particles

Al/Cr2O3 composite particles were prepared by co-precipitation method. Effects of reaction time and calcination temperature on phase composition and morphology were studied by TG-DSC, XRD and SEM. In addition, the infrared emissivity and the reflectivity of Al/Cr2O3 powders with different aluminum contents at the wavelength of 1.06 mu m were also discussed. The results show that the Al/Cr2O3 composite particles with 50wt% aluminum is well coated after reacted for 2h and calcined at 400 degrees C. The optimized Al/Cr2O3 composite particles exhibit dark green appearance for visible light stealth, low emissivity of 0.66 for infrared stealth and low reflectivity of 0.41% for strong laser absorption at the wavelength of 1.06 mu m.