【摘要】 本文应用差热分析、X射线衍射、透射电镜和扫描电镜研究了以TiO₂作晶核剂的Li₂O-Al₂O₃-SiO₂B₂O₃-ZnO系微晶玻璃纤维分相、核化、晶化、微裂纹扩展及其对该系统玻璃纤维抗张强度和耐碱腐蚀性能的影响。测定了该系玻璃纤维分相初始温度、核化温度区间、结构转变温度（T_g）、析晶的程序、活化能、动力学指数、微晶大小及其含量、微裂纹尺寸、抗张强度和碱失重。对微晶玻璃纤维制备过程中伴随的微晶化机理和微裂纹扩展过程作了较深入、细致的探讨。更多还原

【Abstract】 Phase separation, nucleation, crystallization and micro-crack extension as well as their effects on the tensile strength and alkaline resistance of Li₂O-Al₂O₃-SiO₂-B₂O₃-ZnO system glass-ceramic fibers with TiO₂ as a nucleating agent are studied by DTA, XRD, TEM and SEM.Phase separation temperature, nucleation temperature range, transition temperature （T_c）, process and kinetics of crystallization, micro-structure of glass fibers and surface micro-crack size, tensile strength and weight loss due to alkali corrosion are also studied. Mechanism of crystallization and micro-crack extension process during the preparation of glass-ceramic fibers are discussed in detail.The results are as follows: 1.Characteristics of the glasses used in the preparation of glass-ceramic fibers are: temperature of phase separation, nucleation and crystallization should be as low as possible （near T_c as possible） in accordance with the basic properties of the glass, and the rate of dense bulk crystallization should be eassily controlled. 2. The micro-structure of small and concentrated crystalline （the size of micro-crystals is about 25nm while the diameter of glass fibers is 16μm）grown in the glass fibers is benifit for increasing the tensile strength and alkaline resistance of glass fibers. 3.Suitable surface protection and appling an appropriate tensile stress to glass fibers during heat treatment are advantageous for improving the properties of glass-ceramic fibers.更多还原