中文摘要：

利用八水合氧氯化锆、硼酸、柠檬酸、蔗糖为无机原料,聚乙烯醇为纺丝助剂,通过混合制备出二硼化锆（ZrB2）陶瓷前驱体纤维纺丝液,利用于法纺丝法分别在不同纺速下得到ZrB2前驱体纤维,通过傅里叶红外光谱（FT-IR）分析ZrB2前驱体纤维的结构,利用X射线衍射（XRD）、差示扫描量热（DSC）、扫描电镜（SEM）和纤维拉伸强度的测试结果来表征纺速对ZrB2前驱体纤维的影响.结果表明：所得到的纤维均致密且较光滑,且前驱体纤维结构随纺速提升而变得稳定;取向度随着纺速的提升而增加,直径随着纺速的提升而下降;强度随纺速的提高而增加,当纺速为350 m/min时,前驱体纤维强度可达0.89 GPa.

英文摘要：

Solution of ZrB2 ceramic precursor solution for dry-spinning is prepared by distilling the mixture of the precursor solution that is made from ZrOCl2 · 8H2O,boric acid,sucrose,and citric with polyvinyl alcohol solution as spinning assistant.Under different spinning speeds,ZrB2 precursor fibers with different properties can be obtained from precursor solution.The structure of ZrB2 precursor fiber can be analyzed by Fourier transform infrared spectroscopy （FT-IR）.X-ray diffraction （XRD）,differential scanning calorimetry（DSC）,scanning electron microscope（SEM）,and strength test are also used to characterize the effects of different spinning speeds on precursor fibers.The results show that the structures of ZrB2 precursor fibers obtained are all compact and smooth; the increase of spinning speed produces a positive impact on the stabilization of fiber structure,enhancement of orientation degree,decline of fiber diameters,intensified fiber tensile strength and compactness of structure.With spinning speed of 350 m/min,the strength of precursor fibers can reach as high as 0.89 GPa.