Preparation of Mullite Precursor Using Silicic Acid Extracted by Tetrahydrofuran from Sodium Silicate

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J. Korean Ceram. Soc. > Volume 33(8); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(8): 915.

규산나트륨으로부터 Tetrahydrofuran으로 추출된 규산을 이용한 Mullite 전구체 제조

노재성, 홍성수¹, 이범재, 이병기, 박은희², 정홍호

충남대학교 공과대학 정밀공업화학과
¹호서대학교 공과대학 재료화학공학부
²충남대학교 공과대학 정밀공업화학

Preparation of Mullite Precursor Using Silicic Acid Extracted by Tetrahydrofuran from Sodium Silicate

ABSTRACT

Fine mullite precursor was prepared by colloidal sol-gel processes. Aluminum isopropoxide [Al(i-OC3H7)3] as a starting material of Al2O3 and silicic acid extracted by THF from sodium silicate as a starting material of SiO2 were used. Sodium silicate was first acidified by dilute sulfuric acid to form silicic acid. ; followed by extraction using THF, Mullite precursor was synthesized by sol-gel processes from aluminum isopropoxide and sillicic acid considering the degree of extraction of Si and the removal efficiency of Na. The impuri쇼 content of silicic acid extracted by THF was below 0.04% Synthetic mullite precursor consisted of 3Al2O3.2SiO2 and showd spherical particles of 0.05$mutextrm{m}$ diameter and below 0.462% of impurites. The mullite precursor was characterized by EDS, XRD, TG/DSC SEM, FT-IR spectroscopy ICP and TEM

Key words: Mullite precursor, Sol-gel method, Silicic acid, Sodium silicate