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AI_2O_3的杂质含量,是个很重要的问题,因为它直接关系到灯丝绝缘性能的高低。从表 1中可以清楚地看到:杂质含量低的1~#AI_2O_3,其绝缘强度高,灯丝
Al 2 O 3 impurity content, is a very important issue, because it is directly related to the level of filament insulation performance. It can be clearly seen from Table 1: 1 ~ # AI_2O_3 with low impurity content has high dielectric strength,