| abstract |
(57) [Summary] [Constitution] A coating liquid for forming a silica-based coating film, which is formed by mixing one or more polysilazanes having at least a specific repeating unit with a silicon compound having a siloxane bond, and A coated substrate having a silica-based coating formed by using a coating liquid containing polysilazane and a silicon compound having a siloxane bond, wherein the silica-based coating has a nitrogen content of 1% by weight or less. [Effect] By drying the coating film obtained by coating the above-mentioned coating liquid on a substrate and baking it at a temperature of 500 ° C. or lower, A silica-based coating having a nitrogen content of 1% by weight or less is obtained, and the coating thus obtained has excellent chemical resistance such as adhesion to the surface to be coated, mechanical strength, and alkali resistance, At the same time, it is dense and has excellent crack resistance, and furthermore, it is possible to highly flatten the irregularities on the coated surface. |