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在采色显象管和其它电子管中有可能用锶及钙代替钡作消气剂。现已制成了稳定的钙—铝和锶—铝合金消气剂,将这种合金制成粉末,并同镍粉混合后,压入不锈钢制槽形环片内。显象管经过抽气和封口之后,消气剂被加热,它们通过蒸发而沉积在显象管的内表面上,生成一层吸气的锶膜或钙膜。采用吸氧试验,即测定消气膜在不损坏显象管氧化物阴极情况下能够吸收的最高吸氧量,评价了锶消气剂和钙消气剂,并与钡消气剂作了比较。 在25时采色显象管中蒸散后,在初期和经过11个星期和25个星期寿命试验之后,锶和钡都具有相同的吸氧能力。在较小尺寸和表面积的管子中蒸散时,锶的吸氧能力低于钡,这表明通过厚的氧化锶膜的氧扩散较氧化钡慢。钙显示了令人满意的消气速度,寿命试验中管子的正常工作时间达到25个星期。但是,钙的消气能力却较低,相当于钡的四分之一,而且氧气通过氧化钙的扩散速度甚至比氧化锶还慢。
In color tubes and other tubes it is possible to use strontium and calcium instead of barium as a getter. Now that stable calcium-aluminum and strontium-aluminum getters have been made, the alloy is made into a powder and mixed with nickel powder and then pressed into a stainless steel grooved ring. After the tubes have been evacuated and sealed, the getters are heated and they are deposited on the inner surface of the tube by evaporation to form an aspirated strontium or calcium film. The oxygen absorption test was used to determine the maximum oxygen uptake that the getter film can absorb without damaging the CRT cathodes. Strontium getters and calcium getters were evaluated and compared with the barium getters. After evaporating at 25 ° C, both strontium and barium have the same oxygen uptake capacity after initial and after 11 weeks and 25 weeks of life test. Stripping oxygen in strontium less than barium in evapotranspiration in tubes of smaller size and surface area indicates that diffusion of oxygen through a thick strontium oxide film is slower than that of barium oxide. Calcium showed a satisfactory elimination rate, and the life of the tube during normal working hours reached 25 weeks. However, the caloric capacity of calcium is lower, equivalent to a quarter of barium, and the oxygen diffusion rate through calcium oxide is even slower than strontium oxide.