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<p>To reduce the interfacial reaction between titanium alloy castings and CaZrO<sub>3</sub> silica-based investment casting molds, Y<sub>2</sub>O<sub>3</sub> with a mass fraction of 20–80 wt% was added into CaZrO<sub>3</sub>-based facecoat aggregates to prepare investment casting molds, followed by ZTA15 titanium alloy casting. The effect of Y<sub>2</sub>O<sub>3</sub> content on the interfacial reaction was investigated by XRD, SEM-EDS, and DTA. The results show that the addition of Y<sub>2</sub>O<sub>3</sub> forms a Y–Zr–O physical barrier layer on the mold surface, and the integrity of the barrier layer is gradually damaged with the decrease of Y<sub>2</sub>O<sub>3</sub> content. When the Y<sub>2</sub>O<sub>3</sub> content is ≥ 60 wt%, the thickness of the interfacial reaction layer is ≤ 56.4&#xa0;μm, and the reaction products are mainly α-Ti and β-Ti. When the Y<sub>2</sub>O<sub>3</sub> content is ≤ 40 wt%, the reaction layer thickness is ≥ 77&#xa0;μm, and the reaction activation energy decreases significantly. Therefore, within the experimental design range, to ensure the stability of CaZrO<sub>3</sub> silica-based molds in titanium alloy investment casting, the appropriate addition amount of Y<sub>2</sub>O<sub>3</sub> should be no less than 60 wt%.</p>

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Effect of Y2O3 Content on the Interface Reaction of CaZrO3 Silica-Based Molds in Titanium Alloy Investment Casting

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Chongyang Li,
  • Shibing Liu,
  • Xinqi Li,
  • Hongju Li,
  • Tianyi Liu,
  • Hongyu Liu,
  • Hewei Qu

摘要

To reduce the interfacial reaction between titanium alloy castings and CaZrO3 silica-based investment casting molds, Y2O3 with a mass fraction of 20–80 wt% was added into CaZrO3-based facecoat aggregates to prepare investment casting molds, followed by ZTA15 titanium alloy casting. The effect of Y2O3 content on the interfacial reaction was investigated by XRD, SEM-EDS, and DTA. The results show that the addition of Y2O3 forms a Y–Zr–O physical barrier layer on the mold surface, and the integrity of the barrier layer is gradually damaged with the decrease of Y2O3 content. When the Y2O3 content is ≥ 60 wt%, the thickness of the interfacial reaction layer is ≤ 56.4 μm, and the reaction products are mainly α-Ti and β-Ti. When the Y2O3 content is ≤ 40 wt%, the reaction layer thickness is ≥ 77 μm, and the reaction activation energy decreases significantly. Therefore, within the experimental design range, to ensure the stability of CaZrO3 silica-based molds in titanium alloy investment casting, the appropriate addition amount of Y2O3 should be no less than 60 wt%.