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为了提高钨丝的高温抗下垂性能,在氢还原钨之前,将少量的氧化物状态的K、Al和Si,以水溶液的形式加入到氧化钨粉末中,还原的钨粉压制成条。烧结时,让钨条中的Si和Al尽可能地挥发掉,而使K保留下来。当烧结条被旋锻和拉成钨丝时,掺杂钨丝中形成沿纵向拉长的钾管,它近似地沿<110>方向。为了研究掺杂钨丝中钾泡的形成机制,我们进行了钾管分裂和钾泡形成的原位观察。用直径为1.25mm的加工态掺杂钨丝制备成薄膜试样,放在高压电镜中的加热台上进行实验。
In order to improve the high temperature anti-sagging performance of the tungsten wire, a small amount of K, Al and Si in oxide form is added as an aqueous solution to the tungsten oxide powder before the hydrogen reduction of tungsten, and the reduced tungsten powder is pressed into a strip. Sintering, so that the tungsten in the Si and Al volatile as much as possible, leaving K retained. When the sinter strip is swaged and drawn into a tungsten wire, a longitudinally elongated potassium tube is formed in the doped tungsten wire that is approximately in the <110> direction. In order to investigate the formation of potassium bubbles in tungsten doping, we performed in situ observations of potassium tube fragmentation and potassium bubble formation. A thin film sample was prepared by doping the tungsten wire with a diameter of 1.25mm and placed on a heating stage in a high pressure electron microscope.