Impact of H3BO3 on foaming action of CaCO3 in borosilicate foam glasses

摘要

Foam glasses were prepared using borosilicate tube glass cullet along with commercial CaCO3 and H3BO3.The influence of relative content of CaCO3 and H3BO3 on the apparent density,volume and pore size was evaluated.The results show that homogenous microstructures of large pores with the average diameter of 1.0 mm can be obtained by adding small amount of CaCO3 with the aid of 3.0 wt％ H3BO3.On the other hand,the foaming effect of CaCO3 is greatly enhanced with increasing H3BO3.However,excess CaCO3 leads to increase of apparent density and decrease of pore size,and the relevant mechanism is discussed.