Patent ID: 9160010
Filing Date: 2015-10-13
Classification: C03C,H01M,Y02E

Abstract:
1. A method of preparing a self-healing vitreous composition having at least one network-forming oxide, optionally one or more modifying oxides, and at least one healing additive chosen from vanadium and vanadium alloys in the form of solid particles, wherein said method comprises at least the following steps: a first step of preparing a pulverulent vitreous composition consisting of solid particles, by milling a non-pulverulent vitreous composition comprising at least one network-forming oxide and optionally one or more modifying oxides; a second step of preparing a self-healing pulverulent vitreous composition by blending the pulverulent vitreous composition resulting from the first step with solid particles of at least one healing additive chosen from vanadium and vanadium alloys; and a third step of densifying the self-healing pulverulent vitreous composition resulting from the second step, by heat treatment in an inert atmosphere, said third step including at least i) a first substep in which the temperature is rapidly raised at a rate of 30° C./min, up to the densification temperature of the self-healing pulverulent vitreous composition, said densification temperature being determined from the dilatometric softening temperature of the non-pulverulent vitreous composition used during the first step, or by means of a heating microscope: ii) a second substep in which the densification temperature is maintained for a time of 1 to 2 hours; and iii) a third substep of cooling down to room temperature at a rate of 10 to 20° C./min.