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High-temperature-resistant ultra-light aluminum oxide ceramic fibers and sol-gel preparation method thereof
The invention discloses high-temperature-resistant ultra-light aluminum oxide ceramic fibers and a sol-gel preparation method thereof. The preparation method comprises the following steps of: (1) fully dissolving an aluminum source, organosiloxane, water and an acid catalyst in an organic solvent, carrying out reaction for a certain time at a certain temperature, adding a tantalum compound and a hafnium chemical, and performing uniform stirring to prepare a spinning solution; (2) preparing an alkaline coagulating bath, continuously spinning the spinning solution into the alkaline coagulating bath, and carrying out sol-gel chemical conversion to form alumina gel fibers; and (3) carrying out solvent replacement and supercritical fluid drying after finishing spinning, and finally, performingcalcining step by step to prepare the high-temperature-resistant ultra-light aluminum oxide ceramic fibers. The aluminum content of the aluminum oxide ceramic fibers is larger than 95% ; the aluminumoxide ceramic fibers contain a small amount of silicon, tantalum and hafnium elements; the high-temperature resistance of the aluminum oxide ceramic fibers reaches 1500 DEG C or above; the diameter ofthe fibers is 1-500 micrometers; the length of the fibers is 1-500 m; the density of the fibers is smaller than 0.3 g/cm <3>; the production process of the high-temperature-resistant ultra-light aluminum oxide ceramic fibers is simple; the batch production of the high-temperature-resistant ultra-light aluminum oxide ceramic fibers is easy; and the high-temperature-resistant ultra-light aluminum oxide ceramic fibers have a wide application prospect.
本发明公开了一种耐高温超轻氧化铝陶瓷纤维及其溶胶‑凝胶制备方法。所述制备方法包括：(1)将铝源、有机硅氧烷、水、酸催化剂充分溶解在有机溶剂中，于一定温度下反应一定时间，再加入钽化合物和铪化学物，搅拌均匀后制备得到纺丝原液；(2)配置一种碱性凝固浴，将纺丝原液连续纺至碱性凝固浴中，经溶胶‑凝胶化学转变形成氧化铝凝胶纤维；(3)纺丝结束后经溶剂置换和超临界流体干燥，最后再分步煅烧，制备得到耐高温超轻氧化铝陶瓷纤维。该氧化铝陶瓷纤维含铝量大于95％，含少量硅、钽、铪元素，耐高温性能达到1500℃以上，纤维直径1‑500微米，长度为1至500米，密度小于0.3g/cm，生产工艺简单，易批量化生产，具有广阔的应用前景。
High-temperature-resistant ultra-light aluminum oxide ceramic fibers and sol-gel preparation method thereof
The invention discloses high-temperature-resistant ultra-light aluminum oxide ceramic fibers and a sol-gel preparation method thereof. The preparation method comprises the following steps of: (1) fully dissolving an aluminum source, organosiloxane, water and an acid catalyst in an organic solvent, carrying out reaction for a certain time at a certain temperature, adding a tantalum compound and a hafnium chemical, and performing uniform stirring to prepare a spinning solution; (2) preparing an alkaline coagulating bath, continuously spinning the spinning solution into the alkaline coagulating bath, and carrying out sol-gel chemical conversion to form alumina gel fibers; and (3) carrying out solvent replacement and supercritical fluid drying after finishing spinning, and finally, performingcalcining step by step to prepare the high-temperature-resistant ultra-light aluminum oxide ceramic fibers. The aluminum content of the aluminum oxide ceramic fibers is larger than 95% ; the aluminumoxide ceramic fibers contain a small amount of silicon, tantalum and hafnium elements; the high-temperature resistance of the aluminum oxide ceramic fibers reaches 1500 DEG C or above; the diameter ofthe fibers is 1-500 micrometers; the length of the fibers is 1-500 m; the density of the fibers is smaller than 0.3 g/cm <3>; the production process of the high-temperature-resistant ultra-light aluminum oxide ceramic fibers is simple; the batch production of the high-temperature-resistant ultra-light aluminum oxide ceramic fibers is easy; and the high-temperature-resistant ultra-light aluminum oxide ceramic fibers have a wide application prospect.
本发明公开了一种耐高温超轻氧化铝陶瓷纤维及其溶胶‑凝胶制备方法。所述制备方法包括：(1)将铝源、有机硅氧烷、水、酸催化剂充分溶解在有机溶剂中，于一定温度下反应一定时间，再加入钽化合物和铪化学物，搅拌均匀后制备得到纺丝原液；(2)配置一种碱性凝固浴，将纺丝原液连续纺至碱性凝固浴中，经溶胶‑凝胶化学转变形成氧化铝凝胶纤维；(3)纺丝结束后经溶剂置换和超临界流体干燥，最后再分步煅烧，制备得到耐高温超轻氧化铝陶瓷纤维。该氧化铝陶瓷纤维含铝量大于95％，含少量硅、钽、铪元素，耐高温性能达到1500℃以上，纤维直径1‑500微米，长度为1至500米，密度小于0.3g/cm，生产工艺简单，易批量化生产，具有广阔的应用前景。
High-temperature-resistant ultra-light aluminum oxide ceramic fibers and sol-gel preparation method thereof
耐高温超轻氧化铝陶瓷纤维及其溶胶-凝胶制备方法
MA XIAOMIN (author) / ZHANG CHUNSU (author) / LI FUPING (author) / CHEN WEIDONG (author) / ZHANG YINGFENG (author) / WU NANCHUN (author)
2020-08-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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