Scholarlink

<p>The influence of SrO addition (0–3 mass pct) on crystallization kinetics and melt structure in CaO–Al<sub>2</sub>O<sub>3</sub>-based mold fluxes was systematically investigated, employing the single hot thermocouple technique (SHTT), complemented by FTIR spectroscopy and Raman spectroscopy analysis. SHTT characterization revealed a non-monotonic crystallization behavior: Increasing SrO content initially suppressed crystallization within the lower concentration range (0–2 mass pct), followed by a pronounced promotion effect at higher additions. FTIR and Raman analyses indicated that the free O<sup>2−</sup> provided by SrO helped B<sup>3+</sup> to exist in a tetrahedral coordination form, promoting the formation of Al<sub>IV</sub>–O–B<sub>IV</sub> structural units, enhancing the stability of mold fluxes. When the SrO content exceeded 2 mass pct, the effect from network broken by O<sup>2−</sup> became stronger, which would depolymerize the complex silicate structure in the slag. The resistance of ion migration decreases, which promotes the crystallization of mold flux. The addition of 2-mass pct SrO not only promotes the formation of a new low-melting-point phase (Ca<sub>3</sub>B<sub>2</sub>O<sub>6</sub>), but also suppressed the precipitation of Ca<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of SrO on Crystallization Behavior and Structure of CaO–Al2O3-Based Mold Fluxes

  • 期刊论文

  • 发表日期：

    2025年9月19日

查看全文
  • Jia-ning Liu,
  • Xin-gang Ai,
  • Jia-cai Zhang,
  • Hong-bo Zeng,
  • Zhe Ning,
  • Ning-ning Liu,
  • Zheng-guo Xue,
  • Yang Li

摘要

The influence of SrO addition (0–3 mass pct) on crystallization kinetics and melt structure in CaO–Al2O3-based mold fluxes was systematically investigated, employing the single hot thermocouple technique (SHTT), complemented by FTIR spectroscopy and Raman spectroscopy analysis. SHTT characterization revealed a non-monotonic crystallization behavior: Increasing SrO content initially suppressed crystallization within the lower concentration range (0–2 mass pct), followed by a pronounced promotion effect at higher additions. FTIR and Raman analyses indicated that the free O2− provided by SrO helped B3+ to exist in a tetrahedral coordination form, promoting the formation of AlIV–O–BIV structural units, enhancing the stability of mold fluxes. When the SrO content exceeded 2 mass pct, the effect from network broken by O2− became stronger, which would depolymerize the complex silicate structure in the slag. The resistance of ion migration decreases, which promotes the crystallization of mold flux. The addition of 2-mass pct SrO not only promotes the formation of a new low-melting-point phase (Ca3B2O6), but also suppressed the precipitation of Ca2Al2SiO7.