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<p>Waste glass fibers were used as the main raw materials to prepare foamed glass-ceramics with 0–14 wt% H<sub>3</sub>BO<sub>3</sub> as a flux agent. The effects of H<sub>3</sub>BO<sub>3</sub> on the crystallization process, foaming behavior, and physical properties of CaO-MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> 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 H<sub>3</sub>BO<sub>3</sub> modified the surface of glass powders and inhibited crystal precipitation obviously. The low melting point of H<sub>3</sub>BO<sub>3</sub> 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% H<sub>3</sub>BO<sub>3</sub> exhibited excellent properties, possessing a low coefficient of thermal conductivity 0.081 W/(m·K) and relatively high compressive strength 3.36 MPa.</p>

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

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Yu Zhou,
  • Zhiqian Yu,
  • Zhaozhi Xu,
  • Wenkai Gao,
  • Jinchang Li,
  • Lele Chen,
  • Yunlong Yue,
  • Junfeng Kang

摘要

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.