Spaceships and space equipment such as monitoring satellites use advanced insulation spacers.
High-performance insulating spacers for aerospace use:
Fluoride crystal mica (synthetic mica, synthetic mica crystal), belongs to the silicate artificial mica crystal, is under 1500 ℃ high temperature condition, the strict process conditions and the ratio of material, in the platinum crucible smelting of mica crystal. Its chemical formula is KMg3(AlSi3O10)F2, without (OH). Its texture is very pure, electrical performance is very good. The body resistivity is: 1015 ~ 1016 cm(about 1000 times higher than natural mica); Electric breakdown strength: 185 ~ 238 kV/mm, 10 times of polytetrafluoroethylene; Can work under 1100 ℃ environment for a long time. The dissolution and crystallization temperature are 1375 degrees. Hot and cold emergency stability is also very good. The guangzhou five ceprei laboratory (state-level testing center) do to 40 ℃, 70 ℃ for 10 cycling test, all qualified.
The insulating materials used in the general industry are natural mica and teflon.
Natural mica is a kind of underground natural formation of the ore, belongs to the silicate class, its chemical formula ideal for KAl2 (AlSi3O10) (OH) 2 and KMg3 (AlSi3O10) (OH) 2, contains (OH) ˉ (hydroxyl), it is because of the existence of hydroxyl (water molecule), its various aspects performance far below the fluorine mica crystal. Natural mica with impurity, electric performance is not stable, and under high temperature and high frequency electric performance is even worse, when the temperature above 500 ℃, due to dehydration and gradually lose the characteristics of mica.
Ptfe, due to its poor heat resistance performance, can only be used for low temperature environment (generally not more than 300 ℃), and its easy to exist when producing metal impurity, corona resistance is bad.
