The main crystal phase of the polycrystalline mullite fiber is a single mullite phase, which is used in high-temperature polycrystalline alumina fibers at a high temperature, and has the best thermal stability, and a product having a temperature of 1400 ° C or higher is used.
The polycrystalline mullite fiber is a kind of polycrystalline alumina fiber. The content of Al2O3 in the fiber is between 72% and 75%, and the content of Al2O3 is generally more than 80%, which is called polycrystalline alumina fiber.
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