Method for repairing a glass layer of glass-lined equipment by a sol-gel process

摘要

A damaged area of the glass layer of equipment having a glass lining on a metal substrate is repaired by grinding the damaged area to expose the metal substrate, welding onto the exposed metal substrate, especially by electrical resistance spot welding, a metallic fiber sheet, impregnating the metallic fiber sheet with a vitrifiable metallic alkoxide repairing agent as a sol-gel solution and solidifying the repairing agent, vitrifying the repairing agent by heating it to a temperature, such as 300°C to 350°C, not high enough to cause damaging stress in the surrounding glass layer and then filling any remaining voids in the repaired area by applying and vitrifying fresh repairing agent. The sol-gel repairing agent solution as used to impregnate the metallic fiber sheet may contain glass or ceramic in powder form as a filler but the further repairing agent used as aforesaid to fill any remaining voids should not contain such filler.