Abstract
Hollow glass microspheres from sodium borosilicate glass were obtained by high-temperature method, the composition of mass%: 10 Na2O; 8 CaO; 0,3 MgO; 0,2 Al2O3; 9 B2O3; 0,5 SO3; 72 SiO2. It is established that the maximum yield of microspheres up to 87% is observed when using a propane-air torch with the characteristics: the air/propane ratio is 1,3; the maximum temperature on the torch axis is 1900 °C; the opening angle is ~15°; the flow rate of the transporting gas is 0,2 g/s. The hollow glass microspheres obtained in this mode are characterized by a median diameter of 60 microns, an average wall thickness of 1,3 microns, a bulk density of 260 kg/m3 and a calculated strength of 50 MPa.
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