硼酸铝晶须的自诱导合成与表征

以纤维状的碱式碳酸铵铝(AACH)和硼酸为原料，在150℃左右发生低热固相反应，得到铝氧骨架上含有部分硼酸基团的纤维状中间体，接着在助熔剂硫酸钾的存在下将中间体在1100℃焙烧4h，得到反应混合物，用热水洗去该混合物中的可溶性助熔剂，烘干后得到产物。经XRD及SEM表征，证实该产物为直径分布均匀的硼酸铝晶须，晶须的平均直径为0．3um长度平均为15um．鉴于AACH在较低温度分解得到活性氧化铝时还保持着纤维状的形状以及这一温度硼酸基已接到铝氧骨架上的事实，初步提出了原位诱导合成硼酸铝晶须的生长机理。

Self-induced Synthesis and Token of Aluminum Borate Whiskers

Fibroid intermediate , which structure is aluminum-oxygen framework connecting some boric acid radical , were prepared with fibroid ammonium aluminum carbonate (AACH) and boric acid via solid state reaction under a low temperature of 423 K . Then the intermediate were roasted under a high temperature of 1373K for 4h in the presence of fluxing agent potassium sulfate and the mixture was obtained . The mixture was washed several times to remove the dissoluble fluxing agent and dried in an oven. The product was characterized with X-ray diffraction (XRD)as well as scanning electron microscopy (SEM). The characterized results indicated that the products exhibit one -dimensional structure with average diameters 0. 3um and lengths about 15um. AACH keep the fibroid shape and the boric acid radical have connect with the aluminum-oxygen framework when it is decomposed into active alumina in low temperature. Based on these facts, the in situ-abduction growth mechanism of the synthesis was suggested.