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Key words£ºSiO₂-Al₂O₃-CaO-Fe₂O₃ system£» glass-ceramic; crystallization

Õª    Òª£ºÀûÓòîÈÈ·ÖÎö(DTA)¡¢ ºìÍâÎüÊÕ¹âÆ×(IR)¡¢XÉäÏßÑÜÉä(XRD)ºÍɨÃèµç¾µ(SEM)µÈÊÖ¶ÎÑо¿ÁËSiO₂-Al₂O₃-CaO-Fe₂O₃ϵ΢¾§²£Á§¾§»¯¹ý³Ì¼°Æä½á¾§¶¯Á¦Ñ§¡£½á¹û±íÃ÷£º SiO₂-Al₂O₃-CaO-Fe₂O₃ϵ΢¾§²£Á§¾§»¯¹ý³ÌÖУ¬³õ¾§ÏàÊǸÆÌú͸»Ôʯ, ¸ÆÂÁ»Æ³¤Ê¯ÊÇÖмä¹ý¶ÉÏàÇÒË澧»¯Î¶ȵÄÌá¸ß¶øÏûʧ, ×îÖÕ¾§ÏàÖ»ÓиÆÌú͸»Ôʯ£»¾§ÌåÉú³¤Ö¸ÊýΪ2.9, ÊôÈýάÉú³¤¡£ ²£Á§ÍøÂçÖÐÖ÷ÒªÓÐSiO₄, AlO₄¼°Fe₃+O₄ËÄÃæÌå½á¹¹µ¥Ôª£¬ËæºË»¯Ê±¼äÑÓ³¤¼°¾§»¯Î¶ÈÌá¸ß£¬ ºìÍâ×îÇ¿ÎüÊÕ´ø³¯µÍ²¨Êý·½ÏòÒƶ¯£¬ ÎüÊÕ´øÇ¿¶ÈË澧»¯Î¶ȵÄÌá¸ß¶øÔö´ó¡£

Abstract: The crystallization process and kinetics of SiO₂-Al₂O₃-CaO-Fe₂O₃ glassª²ceramic were investigated by using IR, DTA, XRD and SEM. The results show that the initial and final crystalline phase of the glassª²ceramics is Ca(Fe, Mg)Si₂O₆and Ca₂Al₂SiO₇ is the transition crystalline phase. With increasing of crystallization temperature, Ca₂Al₂SiO₇ disappeared. The index of crystal growth is2.9 and it implies that Ca(Fe, Mg)Si₂O₆ crystals grow along three dimensional space. Glasses have interlinked SiO₄, AlO₄ and Fe₃+O₄ tetrahedra as theirmost fundamental units. With prolonging nucleation time and increasing crystallization temperature , the strongest IR absorption bands shift from the high frequency region to lower frequencies region.