中文摘要：

采用水和乙醇混合液为溶剂,八水合氧氯化锆、硼酸、柠檬酸、蔗糖为无机原料,通过溶解混合反应制得无机溶液.利用聚乙烯醇为助剂,通过混合浓缩制备了ZrB2前驱体溶液,并对其进行了流变性能研究与干法纺丝尝试.结果表明,溶液的粘度、储能模量和损耗模量均随温度升高先降低后增加;粘度随着剪切频率及剪切速率的升高而下降,并随着聚乙烯醇含量的升高而下降,说明该溶液为假塑性流体,并且无机成分的加入对其流变性能影响不大;损耗角正切随着温度的升高及剪切频率的增加呈现出先增加后降低的趋势;粘流活化能、非牛顿指数、结构粘度指数均随着聚乙烯醇含量的增加而下降,表明溶液可纺性能得到提升.聚乙烯醇占25％的前驱体溶液可以干纺得到很好的纤维,表明所制得的一系列比例的溶液都可以纺制较好的前驱体纤维,为下一步制备ZrB2陶瓷纤维打下基础.

英文摘要：

The inorganic solution was prepared via the reaction of ZrOCl2 8HzO, H3BO3, citric acid and su crose, distilled water and alcohol were used as solvent. ZrB2 precursor solution was obtained by the mixing of inorganic solution prepared above and PVA solutiorL The rheological behaviors of precursor solution was investigated by rheometer systematically. The results show that there are minimum points of viscosity, storage modulus and loss modulus with the increase of temperature. The viscosity decreases with the increase of shear frequency and shear rate means that precursor solution is pseudoplastic fluid, and it decreases with the increase of PVA content indicating the addition of inorganic substances has little effect on PVA polymer solution. Loss tangents have maximum points with the increase of temperature and shear frequency. Activation energy of viscous fluid flow, non-newtonian index, structure viscosity index decreases with the increase of PVA content indicating that the spinning performance has been im-proved. Fibers with diameters about 20 μm can be obtained by the dry spinning of precursor solution with 25% PVA content, indicating that the precursor solutions with different PVA content can spin easily. It is a basic study for the preparation of ZrBz ceramic fibers.