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电灯泡里的灯丝,是用钨丝制造的。但是电灯泡里面,还有几根金属细线,它们一端焊在电灯泡中玻璃杆的扁圆头上,一端卷着小环,钨丝就由这几根细线架住。这叫做“撑钩”。撑钩要用另一种稀有的金属钼来制造。钼是一种银白色的硬金属。它有很高的熔点(2620℃),在电灯泡点亮、温度很高的时候不会熔化。在高温度下面,它还能保持住原有的弹性。炼钼也跟炼钨一样,是采用的粉末冶金法(参看科学大众1954年5月号“我们试制钨丝成功”一文)。天然的钼矿有辉钼矿[MoS_2]和钼酸铅矿[PbMoO_4]等。工业上,普遍都是采用辉钼矿。
The filament in the bulb is made of tungsten wire. But inside the light bulb, there are also several metal thin wires, one end of which is welded to the oblate head of the glass rod in the light bulb, and one end is rolled with a small ring. The tungsten wire is held by these thin wires. This is called “hooking.” The brace is made of another rare metallic molybdenum. Molybdenum is a silver-white hard metal. It has a very high melting point (2620°C) and does not melt when the bulb is lit and the temperature is high. It maintains its original elasticity even under high temperatures. Molybdenum smelting is also a powder metallurgy method similar to that used for refining tungsten (see Science and Technology, May 1954, “We Successfully Produced Tungsten Wire”). Natural molybdenum deposits include molybdenite [MoS_2] and lead molybdate [PbMoO 4]. In industry, molybdenite is commonly used.