TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: (I) further contains additional healing additives comprising boron, boron tetraboride, boron nitride, silicon nitride or silicon carbide. The self-healing vitreous powder composition contains at least one additive comprising slip additives, binders or additives for sintering aid. Preferred Components: The oxide former and oxide modifier are oxides of elements comprising silicon, boron, phosphorus, aluminum, alkali, alkaline earth metals, iron or zinc. The vanadium alloy is vanadium alloy compound and at least one additional component comprising metallic elements having atomic number of 22-31, 39-42, 44, 47-51, 82 and 83 or non-metallic elements having an atomic number of 5-7, 13-15, 33 and 52. The healing additive is vanadium, vanadium boride and/or vanadium carbide (all preferred), vanadium diboride, vanadium tetraboride, vanadium silicide, vanadium sulfide and/or vanadium phosphide. The solid particles of the healing additive have an average size of 1-60 mu m. The healing additive is present at 5-20 vol.%. The additional additives are present at 1-4 vol.%. Preferred Process: The process comprises mixing vitreous powder composition with the solid particles of the healing additive during the step (b) is carried out by the process of progressive addition or using a mechanical mixer. The heat treatment for densification carried out during the step (c), comprises: (i) a first sub step of rapid temperature rise at a rate of 30 degrees C/minute until the densification temperature of the self-healing powder vitreous composition, where the densification temperature is determined by the dilatometric softening temperature of the non powdery vitreous composition used in the step (a), or by using a microscope heater; (ii) a second sub-step of maintaining the densification temperature for a period of 1-2 hours; and (iii) a third sub-step of cooling to room temperature, at a speed of 10-20 degrees C/minute. The self-healing vitreous composition is intended to be used as a sealing joint in a device operating at high temperature and in that the process further comprises, before the step (C), an additional step of preparing sealing joints by using the self-healing vitreous powder composition within the device, then subjecting the device to the heat treatment for densification in which the sealing joints are made. The heat treatment of the self-healing powder vitreous composition is carried out by a process comprising, other than the sub-steps (i) to (iii), an additional sub-step and preliminary to the sub step (i) during which the self-healing vitreous powder composition is subjected to slow heating, at a rate of 1 degrees C/minute, until a temperature of 450 degrees C. The self-healing vitreous composition is intended to be implemented for the fabrication of bulk self-healing materials and in that process further comprises, prior to the third step of densification, a step of forming the self-healing vitreous powder composition. The self-healing glass composition is a vitroceramic and in that the process further comprises, after the step (c) of densification step, a fourth step of ceramization by heat treatment. EXAMPLE - Typical composition comprised of (in mole%): calcium oxide (14-15); barium oxide (28-29); aluminum oxide (9-10); silicon dioxide (47-48); and vanadium boride (10 vol.%).