【摘要】 采用两段热处理技术，利用Ｘ射线衍射分析、扫描电镜观察等方法研究广２ＭｇＯ－Ｂ＿２Ｏ＿３－ＳｉＯ＿２系的晶化过程，晶化析出相２ＭｇＯ·Ｂ＿２Ｏ＿３的微观形貌具有分形特征，采用密度－密度相关函数法计算其分形维数为１．６３。为揭示２ＭｇＯ·Ｂ＿２Ｏ＿３生长机制，采用Ｍｏｎｔｅ－Ｃａｒｌｏ方法及改进的ＤＬＡ模型对分形生长过程进入计算机模拟。模拟结果与实际分形结构、分形维数相符，表明２ＭｇＯ·Ｂ＿２Ｏ＿３生长是扩散控制凝聚过程。可以预见，分形理论与计算机模拟相结合，将会在探讨未知机理方面发挥重要作用。更多还原

【Abstract】 The crystallization of MgO-B₂O₃-SiO₂ system was investigated by X-ray diffraction （XRD）and scanning electron microscopy （SEM） . The crystalline phase precipitated is 2MgO·B₂O₃,the micrograph ofwhich shows fractal characteristic, and its fractal dimension is 1. 63. In order to reveal the growth mechanism of 2MgO· B₂O₃ , the crystal growth for 2MgO· B₂O₃ dendrite was simulated by computer with Monte- Carlomethod.The resuIt shows that the growth mechanism of 2MgO ·B₂O₃ depends on the diffusion-limited aggre-gatlon（DLA）.It is suggested the fractal theory combined with computer simulation will play an important roleIn the study of unknown mechanism.更多还原