Ce-Al-Cu(贫Cu部分)的相关系及其金属玻璃的形成机制

采用X射线衍射(XRD)、差示量热(DSC)分析方法研究了Ce-Al-Cu(贫Cu部分)合金相关系及金属玻璃的形成。从Ce-Al-Cu三元系合金在熔铸态时的相关系组成图发现,Ce-Al-Cu金属玻璃形成的成分范围主要集中在CeAl+Ce3Al+Ce2AlCu2,Ce3Al+Ce2AlCu2+CeCu,Ce3Al+CeCu+Ce 3个相区,而相Ce3Al为这3个相区所共有。理论分析认为原子簇堆垛阻挫机制是易形成Ce基金属玻璃和具有很低的玻璃化转变温度的原因,这为过冷液体和金属玻璃(AMPs)形成机制的研究提供了信息和研究方向。

Glass Melting Phenomena of a Fluorescent Lamp and a Protection Method by a Metal Ring

The formation mechanism of the discharge spot at a bottom of a lead wire in a fluorescent lamp at end-of-life is investigated. When the lamp at end-of life is ignited by applying high voltage, glow-like discharge is formed on the surface of the lead wire. A few seconds later, a bright spot is formed at the bottom 0fthe lead-wire. Then the stem glass on which the lead-wires are mounted begins to melt. High electric field is formed between the surface of the lead-wire and the stem glass surrounding the lead wire. Then discharge spot will be formed at the contact portion of the lead wire to the stem glass by this high electric field. To prevent discharge spot formation at the bottom of the lead wire, the metal ring is set to encircle the lead wire and is connected to the lead wire potential through a resistor. By this configuration, discharge spot formation is effectively suppressed. The mechanism for preventing hot discharge spot formation by the metal ring is discussed.