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    • 23. 发明授权
    • Antireflective graded index silica coating, method for making
    • 防反射分级二氧化硅涂层,制作方法
    • US4535026A
    • 1985-08-13
    • US509118
    • 1983-06-29
    • Bulent E. YoldasDeborah P. Partlow
    • Bulent E. YoldasDeborah P. Partlow
    • C03C17/25C03B8/00C03C15/00C03C17/02C03C17/27G02B1/10G02B1/11
    • G02B1/113C03C15/00C03C17/02C03C17/27C03C2217/213C03C2218/113C03C2218/322Y10T428/249961Y10T428/249969Y10T428/261
    • Antireflective silica coating for vitreous material is substantially non-reflecting over a wide band of radiations. This is achieved by providing the coating with a graded degree of porosity which grades the index of refraction between that of air and the vitreous material of the substrate. To prepare the coating, there is first prepared a silicon-alkoxide-based coating solution of particular polymer structure produced by a controlled proportion of water to alkoxide and a controlled concentration of alkoxide to solution, along with a small amount of catalyst. The primary solvent is alcohol and the solution is polymerized and hydrolized under controlled conditions prior to use. The prepared solution is applied as a film to the vitreous substrate and rapidly dried. It is thereafter heated under controlled conditions to volatilize the hydroxyl radicals and organics therefrom and then to produce a suitable pore morphology in the residual porous silica layer. The silica layer is then etched in order to enlarge the pores in a graded fashion, with the largest of the pores remaining being sufficiently small that radiations to be passed through the substrate are not significantly scattered. For use with quartz substrates, extremely durable coatings which display only 0.1% reflectivity have been prepared.
    • 用于玻璃质材料的抗反射二氧化硅涂层在宽的辐射带上基本上不反射。 这通过为涂层提供渐变程度的孔隙率来实现,其使空气折射率与基板的玻璃质材料的折射率相等。 为了制备涂层,首先制备了具有特定聚合物结构的硅烷醇盐类涂料溶液,其通过控制比例的水与醇盐和受控浓度的醇盐与溶液以及少量的催化剂一起制备。 主要溶剂是醇,溶液在使用前在受控条件下聚合和水解。 将制备的溶液作为膜施加到玻璃质基材上并快速干燥。 然后将其在受控条件下加热以使羟基自由基和有机物挥发,然后在剩余多孔二氧化硅层中产生合适的孔形态。 然后蚀刻二氧化硅层以便以渐变的方式扩大孔,其中最大的孔保持足够小,使得通过基底的辐射不会显着分散。 为了与石英基板一起使用,已经制备出仅具有0.1%反射率的非常耐用的涂层。