| 摘要 |
PROBLEM TO BE SOLVED: To improve the bonding property of a glass electric bulb and foil made of molybdenum sealed in the electric bulb or doped molybdenum alloy to prolong service life of an electric lamp. SOLUTION: Crude foil is post-treated in such a way that a range of coagulated substance like an island having a material composition composed of crude foil and/or molybdenum or its alloy, titanium, silicon or oxide, mixed oxide and/or oxidized compound which is substantially incontinuous on a surface of at least 5% and 60% to the maximum extent of its surface and has various surface structures occurs under a vapor pressure of 10 mb or less at 2000 deg.C, respectively.
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