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一、前言白炽灯泡钨丝,一般在2600℃左右温度下使用,并要求钨丝保证具有稳定的组织及特有的耐高温性能。掺杂钨丝抗下垂值是评价钨丝高温性能的重要参数。有关掺杂钨丝物理状态的微观组织研究,近年来已不断有报导,而气泡强化理论目前已广泛用于研究钨丝的高温性能。高温长期蠕变条件下,要求起强化作用的气体原子必须是不可溶解的,并具有足够大的蒸气压力,而其元素含量必须很小,以便保证形成一种弥散分布状态。掺杂钨丝制造过程中,铝-硅-钾掺杂剂中的铝和硅,基本上溶于基体;而钾和钨的原子半径差异较大,原子半径大的钾在钨中的扩散能力差。但是,在钨丝加工和回复温度范围内,元素钾的蒸气压很大,并可保证在钨的固溶体中产生较大
I. INTRODUCTION Incandescent bulbs tungsten wire, generally at about 2600 ℃ temperature and require tungsten wire to ensure a stable organization and unique high temperature performance. Doping tungsten filament anti sag value is an important parameter to evaluate the high temperature performance of tungsten wire. Research on the microstructure of doped tungsten filament has been reported in recent years. Bubble strengthening theory has been widely used to study the high temperature performance of tungsten filament. Under long-term high-temperature creep conditions, the gas atoms requiring a strengthening effect must be insoluble and have a sufficiently large vapor pressure, and their elemental content must be small in order to ensure a dispersive distribution. During the fabrication of doped tungsten wire, aluminum and silicon in the aluminum-silicon-potassium dopant are basically dissolved in the matrix. However, the atomic radii of potassium and tungsten are quite different. The diffusion capacity of potassium with large atomic radius in tungsten difference. However, the elemental potassium has a large vapor pressure within the tungsten processing and recovery temperature range and can ensure a large