高性能铝酸钇纤维的制备及结构与性能的研究

In resent years much attention made by developed western country like U.S.A has been focused on the research and development of polycrystalline yttrium aluminum garnet (YAG) fibers which have been regarded as a potential and promising candidate for application in high performance ceramic matrix composites because of the patent and wide uses in aviation and civile technology. Because the commercializtion oxidate matrix cermic fiber could not meet the needs of the cermic matrix composites for temperature-resistance. Therefore, it is urgent seach the new kind of YAG fiber which have the character of excellent high temperature creep resistance and mechanics performance of other oxidation fiber..The project firstly use cheap Al pellets and inorganic yttrium as raw meaterials, and polymerized sol including Al-Y-O was made via hydrolyziton in the condition of proper acid . Then the high performance YAG fiber was made by technology such as dry spinning and last-treatment etc. ICPAES,NMR, TG-DTA, IR, XRD, SEM etc. were used to characterize the influence of sol structure, fluidity and stability made by sol preparation parameters ;the performance of the precursor sol and fibers. The kind of high molecular weight spinning-supporting pruduce which influence on the fluidity character of sipinning primary liquid ;the influence of spinning technology on fiber length,diameter,the degree of equality;the influence of sol and gel fiber technology structure and performance of YAG fiber; the influence of additive Si on the structure, mechanics performance and principle; At last, disclose the intrinsic relativity between the structure and performance. The fufilment of this project will pioneer a new preparation technology of YAG fiber made by Al pellets and inorganic yttrium as raw meaterials. At the same time, systemically reseach the influence of technology parameter on structure and performance of YAG fiber. Furthermore, that disclose the intrinsic relativity between the structure and performance. It has great reality meaning to develop the cheap high performance YAG fiber, prompt the research and development of high-temperature cermic matrix composites and broad the its application in field of aviation and civile technology..

以廉价的金属铝片及无机盐为原料，经成胶、纺丝、后处理等工艺制备高性能铝酸钇纤维。从分子水平深入研究溶胶微观可控规律及其线性结构的形成机理，探索稳定剂对溶胶结构的影响，获得稳定的结构可控的溶胶体系。研究溶胶结构及凝胶纤维后处理参数对最终纤维结构及性能的影响，从而为获得高性能的铝酸钇纤维提供理论指导。