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Abstract
The HPS lamp seal is investigated for bonding alumina and niobium. The properties of the individual crystalline phases are the controlling factors for the overall performance of the lamp seals. Seal structure is evaluated in association with the microstructure, crystal morphology, interfacial reactions (by optical and SEM), thermal expansion, chemical attack, etc. The thermal behavior of the sealing composition based on a CaO-Al2O3 system with other minor oxides (such as SiO2, BaO, MgO) is evaluated with Differential Thermal Analysis (DTA) to determine the melting and crystallization characteristics, that are correlated with some of the physical and chemical properties developed within the seal.