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以水热法合成出BaTi_4O_9和BaTi_5O_(11)两种新型的功能陶瓷纤维,制备了三个体系的BaTi_4O_9纤维复合陶瓷新材料,并对其组织结构、介电性能和室温断裂行为进行了研究。论文取得了如下创造性研究成果:(1)合成出以BaTi_4O_9和BaTi_5O_(11)为主晶相的纤维新材料;对原料K_2Ti_4O_9纤维的形成机制进行了探讨;同时,对中间产物水合二氧化钛纤维的相变过程进行了研究;(2)成功地制备出BaTi_4O_9(f)/(0.64BaTi_4O_9+0.36BaPr_2Ti_4O_(12))(简称BPT系列)和BaTi_4O_9(f)/()(0.64BaTi_4O_9+0.36BaEu_2Ti_4O_(12))(简称BET系列)两个系列复合陶瓷材料,系统研究了BaTi_4O_9纤维的加入量对介电性能的影响,结果表明,含10vol％BaTi_4O_9纤维的BPT和BET试样具有良好的综合介电性能;(3)对BaTi_4O_9纤维和复合陶瓷的组织结构进行了系统研究,揭示了介电性能变化的结构基础,对进一步开发新的相应系列的微波介质陶瓷材料有重要的参考价值;(4)由纯BaTi_4O_9纤维制成的试样具有较好的烧结性和介电特性。
Two new types of functional ceramic fibers BaTi_4O_9 and BaTi_5O_ (11) were synthesized by hydrothermal method. Three new BaTi_4O_9 fiber composite ceramic materials were prepared and their microstructure, dielectric properties and room temperature fracture behavior were studied. The main contributions of this dissertation are summarized as follows: (1) New fiber materials with BaTi_4O_9 and BaTi_5O_ (11) as the main crystalline phases were synthesized. The formation mechanism of K_2Ti_4O_9 fiber was also discussed. Meanwhile, the phase of hydrated TiO_2 fibers (12) (BaTi_4O_9 (0.64BaTi_4O_9 + 0.36BaPr_2Ti_4O_ (12)) (abbreviation BPT series) and BaTi_4O_9 (f) / () 0.64BaTi_4O_9 + 0.36BaEu_2Ti_4O_ (12) were successfully prepared. (BET series) were used to investigate the influence of BaTi_4O_9 fiber addition on the dielectric properties. The results show that the BPT and BET samples containing 10vol% BaTi_4O_9 fiber have good comprehensive dielectric properties. (3) The microstructures of BaTi_4O_9 fiber and composite ceramics have been studied systematically, revealing the structural basis of the change of dielectric properties and have important reference value for the further development of a new series of microwave dielectric ceramic materials. (4) The sample made of BaTi_4O_9 fiber has better sinterability and dielectric properties.