Advantages and disadvantages of natural mica

Under the long-term scouring of high temperature and high pressure water, the natural mica will undergo hydration reaction, which will make the mica discolor, delaminate, scale, wet and even break. Natural muscovite began to lose weight from 200 ℃, and began to decompose when the temperature was higher than 450 ℃, and the thickness expanded, and it lost weight sharply above 600 ℃, and almost completely decomposed at 900 ℃.
The phlogopite begins to decompose at 500 ℃, and the weight loss above 900 ℃ is significant. The specific performance of its weight loss is gradual delamination, discoloration and shedding from 200 ℃. Therefore, the use temperature of natural mica is limited. For ultraviolet light, natural mica is basically opaque, and natural muscovite has an obvious absorption peak at 2.75 μ m (wave number 3636cm-1),