Fluorine crystal mica accompanied the Shenzhou-8 spacecraft to the world.
Fluorine crystal mica belongs to silicate artificial mica crystal. It is melted at a high temperature of 1500 ℃. Because the insulation performance of fluorine crystal mica is very excellent, and very stable and reliable. In 2007, China Light and Power Group Shijiazhuang Shijiazhuang No. 13 Research Institute selected Shenzhou-8 spaceship as insulation gasket to replace natural mica.
Because fluorine crystal mica is grown by strict technological conditions and material ratio (otherwise it can not produce mica crystal), the texture is very pure. Its insulation performance, as well as high temperature resistance, corrosion resistance, high frequency resistance is very excellent. The electrical insulation performance is about 1000 times higher than that of natural mica, and the electrical breakdown strength is 10 times higher than that of polytetrafluoroethylene. And can work at 1100 ℃ for a long time. The stability of cold and hot sudden change is also very good. Ten cycle tests at-40 ℃-70 ℃ were done by five Saibao laboratories in Guangzhou, and all of them were qualified. And because of the pure texture, the parameters are very stable. It is an ideal insulating material in high-end field.
Natural mica is an underground ore, which is naturally formed, contains many impurities and has unstable electrical properties. Due to the presence of hydroxyl (OH) hydroxyl, there is a tendency of weight loss from 200C, and it begins to layer, change color and fall off gradually. When the temperature is higher than 450 ℃, it begins to decompose and the thickness expands. The weight loss is rapid above 600 degrees and decomposes almost completely at 900 ℃.
Polytetrafluoroethylene (PTFE), a commonly used insulation material, can only be used in low temperature environment because of its poor temperature resistance, and it is easy to have metal impurities and poor corona. The electrical insulation properties of natural mica and polytetrafluoroethylene are incomparable to fluorine crystal mica.
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