Effect of H₃BO₃ Content on the Crystallization Process, Foaming Behavior and Physical Properties of Foamed Glass-Ceramics Prepared from Waste Glass Fibers

Abstract

Waste glass fibers were used as the main raw materials to prepare foamed glass-ceramics with 0–14 wt% H₃BO₃ as a flux agent. The effects of H₃BO₃ on the crystallization process, foaming behavior, and physical properties of CaO-MgO-Al₂O₃-SiO₂ foamed glass-ceramics were investigated. The results showed that the main crystalline phase of the foamed glass-ceramics was anorthite with diopside as a minor crystalline phase, which exhibited a typical surface crystallization process. The addition of H₃BO₃ modified the surface of glass powders and inhibited crystal precipitation obviously. The low melting point of H₃BO₃ and the decrease of crystallinity jointly promoted the growth of pores, resulting in a reduction of bulk density and an increase in porosity. The compressive strength and thermal conductivity of the samples were linearly related to the bulk density. In particular, the sample added with 10 wt% H₃BO₃ exhibited excellent properties, possessing a low coefficient of thermal conductivity 0.081 W/(m·K) and relatively high compressive strength 3.36 MPa.

Keywords

foamed glass-ceramics / crystallization / flux agent / pore structure / thermal conductivity

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