| 摘要 |
PROBLEM TO BE SOLVED: To provide a polycrystalline ceramics light-emitting tube for high luminance discharge lamp that is provided with a necessary property at the capillary part without going through a complicated process and without deteriorating the property at the body part, and its manufacturing method. SOLUTION: The water absorption ratio of the formed product is controlled at 20-30 wt.% in the first temporary firing process (S5), and the frit-deposition part of the capillary top end is steeped (S6) in the water solution of magnesium nitric acid of 0.06-0.9 mol/l and fired in the second temporary firing process (S7), and then it is fired (S8) in the hydrogen atmosphere at 1,750-1,900 deg.C, and the average particle size at the frit sealing portion is made smaller than the average particle size of the other portion.
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