论文部分内容阅读
一、前言 显象管中的灯丝,作为阴极加热体,亦称作阴极热子,是一项重要的关键材料。如果灯丝损坏,则阴极将丧失发射电子的能力,使显象管报废。如果灯丝高温强度不够,发生缩丝,阴极电子发射能力不足,直接影响图象清晰度。长期以来,采用不下垂钨丝(通称WAl_2丝)制作显象管阴极热子。由阴极热子损坏而造成显象管的报废率,常常占有相当的比例。带来很大的经济损失。因此,为了提高显象管的生产水平,达到长寿命高可靠,对灯丝材料提出了更高的要求。钨铼合金丝的出现,为显象管技术带来了重大的改进。
I. Introduction The filament in the picture tube, as a cathode heating body, also known as the cathode fever, is an important key material. If the filament is damaged, the cathode will lose its ability to emit electrons, rendering the CRT obsolete. If the filament high temperature strength is not enough, the occurrence of shrinkage, cathode electron emission capacity is not enough, a direct impact on image clarity. For a long time, do not sag tungsten filament (commonly known as WAl_2 wire) CRT cathode fever. Caused by the destruction of the cathode tube kinescope scrap rate, often occupy a considerable proportion. Bring a lot of economic losses. Therefore, in order to improve the production level of CRT, to achieve long-life high reliability, the filament material put forward higher requirements. The appearance of tungsten-rhenium alloy wire has brought significant improvements for the CRT technology.