Scholarlink

<p>This study presents an analytical evaluation of environmentally friendly, inorganic sand mold compositions customized for binder jetting 3D printing. The goal is to reduce material toxicity while maintaining key performance parameters such as flowability, printability, thermal stability, and dimensional accuracy during aluminium casting. The base formulation includes silica sand, sodium silicate powder, and rice starch, further modified with varying proportions of metakaolin, magnesium oxide (MgO), and methylcellulose. A comprehensive set of tests, including flowability evaluations and thermo-mechanical analysis, was conducted to assess the suitability of the formulations. Results showed that moderate addition of metakaolin (2 wt%) could improve the thermal resistance and reduced the LOI, while higher metakaolin content decreased the flowability. MgO enhanced refractoriness but slightly impaired sand flow. Methylcellulose significantly boosted flowability and print resolution, although higher contents marginally affected mechanical integrity. Among the five tested formulations, the composition containing 2% metakaolin, 2% MgO, and 4% methylcellulose achieved the best overall performance, exhibiting high print precision, controlled shrinkage (4.1% during heating, 5.6% during cooling), and low LOI values. Aluminium casting trials qualitatively corroborated the thermal findings and mechanical compatibility of the optimized mixture. These findings provide a solid foundation for sustainable, high-performance binder systems in sand mold fabrication for binder jetting additive manufacturing.</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

Analytical characterization of inorganic powder‑based sand casting mold compositions for binder jetting 3D printing: thermo‑mechanical behavior and aluminium casting performance

  • 期刊论文

  • 发表日期：

    2026年6月25日

查看全文
  • Mohamad Kamyab,
  • ALireza Hajiali Mohammadi,
  • Vincenzo M. Sglavo

摘要

This study presents an analytical evaluation of environmentally friendly, inorganic sand mold compositions customized for binder jetting 3D printing. The goal is to reduce material toxicity while maintaining key performance parameters such as flowability, printability, thermal stability, and dimensional accuracy during aluminium casting. The base formulation includes silica sand, sodium silicate powder, and rice starch, further modified with varying proportions of metakaolin, magnesium oxide (MgO), and methylcellulose. A comprehensive set of tests, including flowability evaluations and thermo-mechanical analysis, was conducted to assess the suitability of the formulations. Results showed that moderate addition of metakaolin (2 wt%) could improve the thermal resistance and reduced the LOI, while higher metakaolin content decreased the flowability. MgO enhanced refractoriness but slightly impaired sand flow. Methylcellulose significantly boosted flowability and print resolution, although higher contents marginally affected mechanical integrity. Among the five tested formulations, the composition containing 2% metakaolin, 2% MgO, and 4% methylcellulose achieved the best overall performance, exhibiting high print precision, controlled shrinkage (4.1% during heating, 5.6% during cooling), and low LOI values. Aluminium casting trials qualitatively corroborated the thermal findings and mechanical compatibility of the optimized mixture. These findings provide a solid foundation for sustainable, high-performance binder systems in sand mold fabrication for binder jetting additive manufacturing.