Properties of Hollow Glass Microspheres Obtained in a Propane-Air Torch

• Published in: Glass and ceramics Vol. 80; no. 3-4; pp. 125 - 130
• Main Authors: Shekhovtsov, V. V., Kaz’mina, O. V., Skripnikova, N. K., Skirdin, K. V., Bakshanskii, R. Yu, Belyaeva, A. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-07-2023; Springer; Springer Nature B.V
• Subjects: Aluminum oxide; Boron oxides; Borosilicate glass; Bulk density; Carrier gases; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Diameters; Glass; High temperature; Materials Science; Microspheres; Natural gas; Natural Materials; Propane; Silicon dioxide; Sulfur trioxide; propane-air medium; soda-borosilicate glass; hollow glass microspheres
• ISSN: 0361-7610; 1573-8515
• DOI: 10.1007/s10717-023-00570-0

Hollow glass microspheres were obtained from soda-borosilicate glass by a high-temperature method, weight content, %: 10 Na
2
O; 8 CaO; 0.3 MgO; 0.2 Al
2
O
3
; 9 B
2
O
3
; 0.5 SO
3
; 72 SiO
2
. It was ascertained that the maximum yield of microspheres, up to 87%, is observed on use of a propane–air torch with the following characteristics: air/propane ratio 1.3; maximum temperature on the flame axis 1900°C; opening angle about 15°; and, flow rate of carrier gas 0.2 g/sec. The hollow glass microspheres obtained in this regime are characterized by median diameter 60 μm, average wall thickness 1.3 μm, bulk density 260 kg/m
3
, and calculated strength 50 MPa.