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本文用离子探针(IMA)和扫描电子显微镜(SEM)对不同寿命显象管中阴极的失效机理进行了初步分析。结果表明:不同寿命下超额Ba在涂层内的分布是中间含量大于两端,其含量峰值随寿命下降并内移,相对含量亦随寿命而降低;寿命初期Ni与涂层介面处有Mg的富集峰。随着寿命加长,Mg的总量降低,富集蜂内移;在Ni中有Ba的“反扩散”现象,Ba的累积量和渗透深度均随寿命而增加。上述现象对电子发射均产生不良影响。
In this paper, ion-probe (IMA) and scanning electron microscopy (SEM) were used to analyze the failure mechanism of cathodes in different life kinescopes. The results show that the distribution of excess Ba in the coating at different lifetimes is larger than the two ends, and the peak value decreases with life expectancy, and the relative content also decreases with life expectancy. At the beginning of life, Ni and coating interface have Mg Enrichment peak. With the increase of life expectancy, the total amount of Mg decreased and the bee migrated inside. The “anti-diffusion” phenomenon of Ba in Ni and the cumulative amount and infiltration depth of Ba all increased with life expectancy. These phenomena have an adverse effect on the electron emission.