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一般“彩管”老化是因阴极衰老引起的。阴极发射能力会随使用时间而逐渐降低,它的寿命取决于阴极涂层的活性状态和工作环境。“彩管”的氧化物阴极是在基金属表面涂敷一层活性物质(钡、钍、锶、钙、镁、锆的氧化物以及它们的化合物)。它对基金属(钨、钼)内部的自由电子起加速作用,从而提高阴极的发射能力;涂层的厚度为10～100μm。阴极衰老实际是涂层的衰老,处理阴极衰老应从涂层衰老原因谈起。
General “CPT ” aging is caused by the cathode aging. Cathode emission capacity will gradually decline with the use of time, its life depends on the active state of the cathode coating and the working environment. “CPT ” oxide cathode is coated with a layer of active material (barium, thorium, strontium, calcium, magnesium, zirconium oxide and their compounds). It accelerates the free electrons in the metal (tungsten, molybdenum), thereby increasing the cathode emission; the thickness of the coating is 10 ~ 100μm. Cathode aging is actually the aging of the coating, dealing with the aging of the cathode coating should be about the reasons for aging.