Preparation And Characterization Of Composite Particles Of Spherical Aluminum Powder For The Nuclear

Because of lower emissivity, the powder of metal aluminum is widely used for IR camouflage dope. However, its reflectivity is high, so it is incompatible for multichannel hiding. Furthermore it is oxidized easily in the air. To overcome its shortage, the producing technic for nano-particles and composite-particles is introduced in the thesis. Firstly, nano-ZnO and PS are synthesized, which is IR-transparent rendering pigment. Secondly, the powder of metal aluminum is coated by the maternal with nano-ZnO or PS and the coated composite particles are prepared by this technic. The making mechanism and technics condition of the composite particle are discussed in the thesis.At first, Nano-ZnO and ZnO/Al composite particle is prepared with homogeneous precipitation method and Sol-Gel method. The impact of using different producing conditions of the above two methods on coated effect is studied here and making technics and coated effect of the two methods is compared. Then PS/Al composite particle is prepared with emulsion polymerization and the impact on coated effect by using different surfactants to composite particle in the emulsion polymerization is discussed. At last, the composite particle is characterized through the following analysis methods: SEM, FTIR, XRD and Mastersize Microplus.Through the research of the thesis, various even and compact coted composite particles are produced with the globular aluminum powder as a maternal particle and exterior layer of the maternal particle coted with nano-ZnO or PS. Therefore, the research of the thesis is a pilot study for implementing developing composite particle of low emissivity in multichannel hiding and coated dope.