铝粉/磷酸镝复合颗粒的制备与性能研究

A study on preparation of Al/DyPO_4 composite and its property

以六水合硝酸镝和磷酸二氢铵为主要原料,在铝粉表面包裹磷酸镝,制备得到铝粉/磷酸镝复合颗粒,对复合颗粒的形貌、结构、光学和红外性能进行了表征分析。通过改变反应浓度和反应温度得到具有较低发射率和在特定波长具有吸收的功能颗粒。当铝粉质量浓度为16.67 g/L、硝酸镝和磷酸二氢铵浓度为0.014 mol/L时,Al/DyPO4复合颗粒的红外发射率可降低至0.70,相比纯磷酸镝降低了24%,且在810、908、1 100、1 290 nm等波段存在明显的特征吸收、低反射特性。

Aluminum powders coated by dysprosium phosphate （DyPQ） is synthesized by heterogeneous precipitation using dysprosium nitrate and ammonium dihydrogen phosphate as raw materials. The morphology, structure, optic and infrared properties of these composite particles are characterized. The low infrared emissivity and special absorption at certain wavelengths of the composite particles can be adjusted by varying reactants＇ concentration and reacting temperature. When mass concentration of aluminum is 16. 67 g/L, molar concentration of DyPO4 and NH4 H2 P04 each is 0. 014 mol/L,the infrared emissivity of composite particles can be 0. 70 ,which is decreased by 24% compared with the pure DyPO4 ,and has characteristic absorption and low reflectivity at wavelength of 810,908,1 100,1 290 nm.