流延法制备高性能BaMgSiO4基光致变色陶瓷OA

Inorganic photochromic materials have wide applications in intelligent displays,optical storage,optical switching,and so on.Currently,the main preparation method for photochromic ceramics is the solid-state method,however,the materials fabricated by this method still face poor mixing uniformity,low mass transfer efficiency,and inhomogeneity during the high-temperature sintering process.Additionally,it is difficult to prepare larger size sam-ples,then restricting their practical applications.In this work,a series of BaMgSiO4:0.5％Eu2+/x％Fe3+(mole fraction)photochromic ceramics were prepared using both the solid-state method and the tape-casting method.By comparing the ceramics prepared by these two methods,it was demonstrated that the tape-casting method can optimize the material's microstructure,thereby enhancing its color-changing and mechanical properties.In terms of mechanical properties,the ceramics prepared by the tape-casting method exhibit higher density and lower porosity;moreover,both their hardness and fracture toughness are superior to those of the ceramics prepared by the solid-state method.Further-more,the prepared BaMgSiO4-based ceramics possess excellent reversible photochromic properties.Under 365 nm ultraviolet(UV)or sunlight irradiation,these samples can change their colors from white to pink,and the coloration contrast reaches 92.9％.Additionally,they have a fast response speed,can realize the maximum coloration contrast within 6 s.Therefore,the tape-casting preparation method demonstrates significant prospects for photochromic mate-rials in ceramic backplanes and multi-functional display applications.