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用金相观察了掺杂钨丝和纯钨丝在通电加热熔断断口处的孔洞结构。残留在钨丝中的钾对孔洞的生成起主要的作用。孔洞的形成和长大先是钾原子向晶界聚集,然后失去了钾原子的钾泡在高温下分解成空位和空位群,这些空位和空位群在晶体点阵中迁移,并向有钾原子聚集的晶界会合,才形成了一系列大小不等的孔洞。孔洞的生成导致局部地区的温度过高而熔断。
The pore structure of the doped tungsten wire and the pure tungsten wire at the fused fracture of the electric heating was observed by metallography. Potassium remaining in the tungsten filament plays a major role in hole formation. The formation and growth of the pores are mainly caused by the accumulation of potassium atoms into the grain boundaries, and then the potassium bubbles, which have lost their potassium atoms, decompose into vacancies and vacancy groups at high temperatures. These vacancies and vacancies migrate in the crystal lattice and accumulate The grain boundaries meet, it formed a series of different sizes of holes. The formation of holes led to the local area of the temperature is too high and blown.