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黑白显象管冷态时,虽然管内大面积的内表面及电子枪的零部件会放出气体,但由于管内锥体内表面所复盖的钡膜的吸气作用,因此管内氧化性气体的平衡压强较低,其平衡压强一般在10~(-9)杔以下。 当显象管开始工作,产生电子束扫屏时,管内的氢、氮、一氧化碳的分压强会上升,其中氢气尤为剧烈。管子在寿命过程中,氮气和一氧化碳的放气速率会逐渐变小,而氢气的放气速率在2000小时之内基本不变。很明显,这些气体压强的上升,是萤光屏受到电子轰击引起这些气体介吸的结果。
Although the internal surface of the tube and the parts of the electron gun emit gas when the monochrome display tube is cold, the equilibrium pressure of oxidizing gas in the tube is higher than that of the barium film covered by the inner surface of the tube. Low, the equilibrium pressure is generally 10 ~ (-9) 杔 below. When the tube starts to work, resulting in electron beam scanning, the tube of hydrogen, nitrogen, carbon monoxide partial pressure will rise, of which hydrogen is particularly intense. During the life of the pipe, the purge rates of nitrogen and carbon monoxide will gradually decrease, while the purge rate of hydrogen will not change substantially within 2000 hours. Obviously, the rise of the pressure of these gases is the result of the electron bombardment of the screens with these gases.