Modification of ZnS∶Mn Phosphors by Sb-Doped SnO2 Coating

The coating of ZnS∶Mn by Sb-doped SnO2 using an co-precipitation process was reported. ZnS∶Mn phosphor particles were prepared by solid reaction with ZnS and MnCl2·4H2O. Surface modification of the ZnS∶Mn powders was carried out by coating transparent conductive films of Sb-doped tin oxides which were formed by co-precipitation and heat treatment process. Tin tetrachloride and antimony trichloride were used as the precursor materials for the co-precipitation. The influences of coating molar ratio, Sb concentration in the coatings, annealing temperature and time on the resistivity of coated ZnS∶Mn phosphors were investigated. The optimum co-precipitation processing parameters and annealing conditions were determined. The phosphors were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence(PL) observation and conductance measurements. An improvement in phosphors conductivity was observed while the respective photoluminescence intensity is analogous to the as-prepared ZnS∶Mn phosphors.

回转窑轮带挡圈磨损脱落原因分析及解决方案

回转窑在运行过程中经常会出现轮带侧边缘与挡圈挤压过紧,导致轮带侧边缘及挡圈磨损严重、脱落等情况,严重时甚至导致停窑,通过分析发现主要原因是轮带下方浮动垫板歪斜,结合实际案例给出了解决方案。