Method of making a glass-metal joint, glass-metal joint made thereby and method of making a solar energy tube collector with said joint

摘要

The method of making a vacuum tube collector or X-ray tube, which includes a matching glass-metal joint, includes providing a glass tube ( 1 ) made of a glass with a composition, in percent by weight on the basis of oxide content, consisting of B2O3, 8-11.5 Al2O3, 5-9 Na2O, 5-9 K2O, 0-5 CaO, 0.4-1.5 balance, SiO2 and bonding, preferably fusing or melting, an end portion of the glass tube ( 1 ) with a metal part ( 2 ) in order to bond or attach the glass tube to the metal part, thus forming a long-lasting glass-metal joint. The method of making the glass-metal joint is performed without using intermediary glass compositions of varying thermal conductivities. In the case of the vacuum tube collector the method can provide the basis for an automated manufacture of the vacuum tube collector.