铠装硅酸钾胶黏剂在特殊工况下的绝缘失效分析

Failure insulation of armored potassium silicate adhesive in special condition

为探索铠装硅酸盐胶黏剂在特殊环境下的绝缘特性,本文制备不同碱金属离子含量及固液配比的硅酸钾胶黏剂样品,将其固封于不锈钢管体中,在潮湿环境与高温条件下分析其绝缘性能并进行失效分析。结果表明:在潮湿环境中,胶体中的固液配比及碱金属(K+)含量会影响铠装试样的整体绝缘性能,当固液配比为2∶1时,硅酸钾与硅溶胶质量比在(2~1)∶1之间时,其绝缘效果较佳;在高温条件下,随着温度的升高及保温时间的延长,铠装壳体中部分合金元素渗入胶体表面,造成样品绝缘性能较大幅度的下降。

The properties of insulation of armored silicate adhesive in special conditions were studied in this article.The adhesives with different K+concentration and ratio of liquid and solid were solid sealed into stainless steel casing.The insulation of samples in the environments of high humidity and temperature were measured.The results indicate that in a humidity environment,the ratio of liquid and solid in colloid and the potassium ion concentration affect the insulation properties of samples.When the ratio of solid and liquid is 2/1 and the quality between potassium silicate and silica sol is(2—1)∶1,the insulating performances good properties.In the condition of high temperature,the insulation properties of samples decrease with the increase of heating temperature and holding time.During the heating process,some alloying elements ofarmored shell move into the colloid surface which results in decrease of insulation properties.