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In this study, ceramic-metal (Al2O3–Nb) sealing was performed by melting an Al2O3 capillary with Nd:YAG laser irradiation while using MgO as a grain-growth inhibitor. The effect of MgO on annealing during the cooling step was that it effectively prevented the formation of the extremely large voids that are typically formed in melted Al2O3 capillaries by the decomposition of the sintered body. The...
Polycrystalline aluminum oxide has been used to realize a higher luminance for the arc tubes of metal-halide lamps. However, cracks occasionally develop inside the glass frit used for sealing. The microstructures of samples, which were sealed by annealing during the cooling step of the sealing process, were investigated at the interface between the Al2O3 capillary and the glass frit. The Al2O3 grains...
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