Method of making a glass body with a phosphorous- and porous SiO2-containing coating, glass body made thereby and solution for making same

Abstract

The glass body used in a solar energy apparatus is provided with an adherent and anti-reflective coating on at least one of its sides. The coating contains phosphorous and porous SiO2 and preferably has a rubbing resistance criterion according to DIN 58196-5, intensity of testing H50, of 2 or better. The method of providing the glass body with the coating includes dipping the glass body in a H3PO4- and SiO2-containing volatile solution, withdrawing the glass body at a speed of from 1 mm/s to 20 mm/s from the solution and tempering the glass body at a temperature of under Tg of the glass. The solution for making the coating containing porous silica and phosphorous is also part of the invention. It preferably has a pH of from 1 to 2 and contains from 0.1 to 2 percent by weight of HNO3 or HCl, a lower alcohol with from one to five carbon atoms, from 0.1 to 3.5 percent by weight H3PO4 and from 0.5 to 7 percent by weight of an SiO2 sol.

Dependencies are inferred from the claim text.