초록 ▼

In connection with a device for casting lead grids for electric battery plates, a highly porous ceramic mold lining, preferably of zirconium oxide, is prepared by flame-spraying. Such a lining can include a thin surface coating on a profiled, basic metallic mold or a separately prepared insert plate

In connection with a device for casting lead grids for electric battery plates, a highly porous ceramic mold lining, preferably of zirconium oxide, is prepared by flame-spraying. Such a lining can include a thin surface coating on a profiled, basic metallic mold or a separately prepared insert plate which is retained to a metallic mold molder. The ceramic surface coating may be accurately formed in place, or may be formed as an over-spray which is then reduced in thickess. Formation of the surface coating may be accomplished by placing masks on the basic metallic mold during the flame spraying, for those areas of the grid which tend to accumulate material, or by adjusting an initially coarse profile of the ceramic layer to the exact profile of the casting by a material-removing treatment. Alternatively, the insert plate may be manufactured on a matrix with a surface contour which corresponds to the half-profile of the lead grid, as a positive mold to which the ceramic material is applied by flame-spraying after an intermediate coating with a removable adhesive layer. The resulting ceramic coating is then subjected to surface grinding, and is removed from the matrix.

대표청구항 ▼

A process for manufacturing a device for casting lead grids for electric battery plates from a lead melt, which device is formed of a ceramic material having a surface which defines a mold for a grid casting and which is in direct contact with the melt which flows into the mold, comprising the steps

A process for manufacturing a device for casting lead grids for electric battery plates from a lead melt, which device is formed of a ceramic material having a surface which defines a mold for a grid casting and which is in direct contact with the melt which flows into the mold, comprising the steps of: providing a profiled, basic metallic mold for receiving the ceramic material; sand-blasting the profiled, basic metallic mold; plating the sand-blasted, profiled, basic metallic mold by flame-spraying with a layer comprised of an alloy selected from the group consisting of chromium, cobalt and nickel, prior to application of the ceramic material, to improve adhesion of the ceramic material; and applying the ceramic material to the plated, profiled, basic metallic mold by flame-spraying, thereby forming the ceramic surface of a highly porous ceramic material.