SEALING OF CURRENT LEADS WITH MICA-GLASS CERAMIC MATERIAL
Any current lead contains the conductive terminals, insulators, and parts for strength and tightness. Isolators are often made of plastics, ceramics or glass, but plastics have limited gas tightness, strength and resistance to heat. Ceramics is gas-permeable, low-tech and poorly handled. When soldering the glass-to-metal there are a number of technological problems. In the present work a mechanically handled mica-glass ceramic material is offered as an insulator, which provides operational properties at the level of glass and porcelain, but much smarter in treatment. The strength and rigidity of the proposed structures is achieved by using an interference fit. The tightness of the cheaper and mass structures is ensured by impregnation of the exterior and mating surfaces with polymer compositions. For more tough operating conditions the technology of soldering was worked out. Since both the sitall and the glass can only experience compression or shear stresses in a real current drive, the tensile strength is indicative of the high performance of the entire structure. As a result of the work the technology was developed for assembly of a current lead with an insulator made of glass-ceramic. Two sealing technologies were proposed and implemented: impregnation of the polymer composition and the sealing with glass of specially selected composition.