【摘 要】
：
The interaction mechanism and phase evolution of ammonium polyphosphate (APP) mixed with muscovite (APP/muscovite) were studied by TG, XRD and SEM, respectively, during heating. When the temperature is not higher than 300℃, muscovite has no effect on the
【机 构】
：
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
The interaction mechanism and phase evolution of ammonium polyphosphate (APP) mixed with muscovite (APP/muscovite) were studied by TG, XRD and SEM, respectively, during heating. When the temperature is not higher than 300℃, muscovite has no effect on the thermal decomposition of APP, and the initial decomposition temperature of APP/muscovite at 283℃ is basically the same as the APP at 295℃, and the main thermal decomposition products are polyphosphoric acid and NH4H2PO4 at 300℃. The polyphosphoric acid, the decomposition products of APP, can enable K and Si out of muscovite and interact with muscovite chemically to generate Al2O3·2SiO2,α-SiO2 and phosphates (AlPO4 and K5P3O10) compounds during 400℃-800℃, which own obvious adhesive phenomenon and porous structure with the apparent porosity of 58.4%. Further reactions between phosphates other than reactions among Al2O3·2SiO2 andα-SiO2 can generate KAlP2O7 at 1 000℃ and the density of residual product is improved by low melting point phosphate iflling pore to form relatively dense structure and decrease the apparent porosity to 44.4%. The lfame resistant and self-supported ceramic materials are expected to enhance the ifre-retarding synergistic effect between APP and muscovite.
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