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制备了不同成分配比的耐高温硅酸盐胶黏剂,用体视显微镜、扫描电镜观察胶体的形貌,用低载荷拉伸试验机测试其粘结力,并分析试样在高温条件下及饱和水蒸汽环境中的绝缘性能。结果表明:随着硅酸盐胶黏剂的液相组分中SiO_2/M_2O模数比变小、固相粉末粒度分布范围变宽及液固相质量比的适当调节,其粘结强度均有较大的提升;胶黏剂绝缘的性能随着温度的升高而恶化并存在绝缘电阻大幅下降的临界温度,碱金属离子含量的增加降低其临界温度并加快其下降趋势;在饱和水蒸气环境中胶黏剂绝缘性能普遍降低,对固化后的胶体进行高温热处理使其绝缘性能有较大提升,但碱金属离子含量和胶体微观裂纹会降低其绝缘性能。
Preparation of different composition ratio of high temperature silicate adhesive, with stereomicroscope, scanning electron microscopy morphology of the colloid, with a low load tensile testing machine to test its adhesion, and analysis of the sample at high temperature conditions And saturated water vapor environment insulation. The results show that with the decrease of SiO_2 / M_2O ratio in the liquid phase, the broadening of particle size distribution of solid phase powder and the proper adjustment of mass ratio of liquid to solid, the bonding strength of silicate adhesive Greatly improved. The performance of adhesive insulation deteriorated with the increase of temperature and there was a critical temperature at which the insulation resistance dropped significantly. The increase of alkali metal ion content decreased the critical temperature and accelerated the decrease tendency. In the saturated steam environment The insulation properties of the adhesives are generally reduced. The high temperature heat treatment of the cured colloids can greatly improve the insulation properties, but the alkali metal ion content and colloidal microcracks will reduce the insulation properties.