FACTORS GOVERNING THE TENSILE STRENGTH OF BASALT FIBRE

摘要

In this study, using basalt fibers produced by different manufacturers as the study subject. The basalt fibers were characterized by scanning electron microscope (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy. The chemical composition of basalt fibers were determined by inductively coupled plasma-optical emission spectroscopy (ICP-OES) and potassium dichromate titrimetric method. The mechanical properties of single fibers were investigated by tensile tests using XQ-1A fiber tensile tester. The influences of Al_2O_3 content, Al_2O_3/network former, Fe~(3+)/ΣFe on the mechanical properties of basalt fibers were investigated in details. The results showed that layered structure unit, chain structure unit, island structure unit and Si-Al replacement unit are all exited in basalt fiber microstructure. Al_2O_3 content plays a key role in the mechanical properties of basalt fibers, followed by Fe~(3+)/ΣFe. Fe~(3+)/ΣFe destroyed the regular pattern of the chemical composition in microstructure.