Study on the Nigrescence Mechanism of Lanthanon Luminescent Material Frictionizing with Metals

Study on the Nigrescence Mechanism of Lanthanon Luminescent Material Frictionizing with Metals
　　Accumulating luminous fibers are produced in the way of melting and matrix spanning. Its basic material is terylene resin, and lanthanon aluminates atom and assist acidifier of nanometer are appended in. If only this fiber absorbs any visible light for 10 minutes, it can store up light energy in, and shine in the dark. Moreover, it can be used infinitely. It can be widely used in aviation and navigation, defence industry, construction project and decoration, transportation , nighttime neodymium magnets working, everyday life and entertainment costume, etc.The more used luminous material is the rare-earth aluminates phosphorescence material in which SrAl2O4:Eu2+,Dy3+ is the most widely used. Luminous fiber was made by the filature process of co-mixing of the luminous powder and the polymer.
　　The luminous fiber which made in the co-mixing way was found nigrescent. It not only affects the textile fiber’s outward appearance but also the brightess.As the effects of the screw-melt-fed spinning machine and the blender are the similar, blenders are used to simulate the luminous fiber’s production process. SrAl2O4:Eu2+,Dy3+ powder was been put into different vessels and stirred under dissimilar conditions. Different factors that made powder nigrescent was studied. The conclusion is that stirring in nonmetallic vessels such as glass, ceramic and plastic SrAl2O4:Eu2+,Dy3+ powders will not nigrescent while in metallic vessels will nigrescent. Metal type is the primary factor of SrAl2O4:Eu2+,Dy3+ powder’s nigrescent. Chemic analytical method,Thermo-gravimetric and http://www.chinamagnets.biz/ Differential thermal analysis (TG-DTA), X-ray diffraction(XRD) and Scan electron microscope(SEM) are used to analyse the nigrescent powder. The nigrescent mechanism is that erosion made metallic oxide mixed in the powder.