Turkish Journal of Chemistry
DOI
10.55730/1300-0527.3620
Abstract
A weak acidic complex ester (CE) in solid form was prepared by a condensation reaction between very weak boric acid (BA: H3BO3) and (D)-mannitol (MA: C6H14O6) by the molar ratio of BA/MA = 2. A boron carbide (B4C) precursor was obtained from heating of the CE at 400 °C for 4 h. The precursor was pyrolyzed under argon flow in the interval of 1300–1550 °C for 4 h and at 1400 °C for 1–4 h, respectively. The materials were examined using several techniques such as X-ray diffraction analysis, thermal analysis, scanning electron microscopy, particle size distribution, and nitrogen adsorption/desorption. The optimum pyrolysis temperature and duration were 1400 °C and 4 h, respectively. The most crystalline B4C particles were distributed between 1 and 100 µm with a mean particle size of 20 µm. The specific surface area and specific pore volume were 13.5 m2 g–1 and 0.09 cm3 g–1, respectively. The size of the pores was between 2 and 36 nm with a mean size of 14 nm.
Keywords
Boric acid, boron carbide, ester, mannitol, pyrolysis
First Page
1370
Last Page
1379
Recommended Citation
PEKDEMİR, ABDULLAH DEVRİM; ÖNAL, MÜŞERREF; and SARIKAYA, YÜKSEL
(2023)
"Optimum pyrolysis conditions to prepare the most crystalline boron carbide powder from boric acid–mannitol complex ester,"
Turkish Journal of Chemistry: Vol. 47:
No.
6, Article 7.
https://doi.org/10.55730/1300-0527.3620
Available at:
https://journals.tubitak.gov.tr/chem/vol47/iss6/7
