Preparation of long alumina fibers by sol-gel method using tartaric acid

Abstract

Long alumina fibers were prepared by sol-gel method. The spinning sol was obtained by mixing aluminum nitrate, tartaric acid, and polyvinylpyrrolidone with a mass ratio of 10:3:1.5. Thermogravimetry-differential scanning calorimetry (TG-DSC), Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the properties of the gel and ceramic fibers. A little of α-Al 2 O 3 phase is observed in the alumina precursor gel fibers sintered at 1273 K. The fibers with a uniform diameter can be obtained when sintered at 1473 K, and its main phase is also indentified as α-Al 2 O 3 .

Effect of the addition of acetic acid on spinning sol and mullite fibers properties

“…It was shown that the aluminum powder had the highest solubility at 95 ℃, and a colorless and transparent alumina sol with the highest solid content was obtained; the spinning sol was best spinnable when the molar ratio of formic acid to acetic acid was 1.15:0.85. Tan Hongbin`s group [12,[17][18] used tartaric acid, malic acid and lactic acid separately to react with aluminum nitrate and get ACs. When the mass ratio of aluminum nitrate: organic acid was 10:3, the sol spinning performance was the best.…”