Scholarlink

<p>Non-occupying coatings (NOCs) technology employs a “coating-first, molding-second” process, where a curable coating is applied to a pattern and transferred upon demolding to form the mold/core surface, enabling precise geometry replication and defect elimination. This demands superior coating properties, including stability, rheology, and bond strength. Silica fume—an ultrafine powder with high specific surface area and silanol groups—is a promising yet poorly understood reinforcement for NOCs. This study demonstrates that silica fume acts through a triple mechanism: rheological control, structural densification, and interfacial reinforcement. At 3 wt%, it increases brushing index by 66.7% with full suspensibility; at 2 wt%, it reduces liquid carrier demand by 11.8%, halves drying time, and enhances thermal stability. Wear resistance improves by 50.6% via densification, while a synergistic hydrogen–chemical bonding mechanism boosts coating–sand bond strength by 130% (to 182 kPa). These insights guide the design of high-performance NOCs.</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

Silica Fume in Non-Occupying Coatings: Mechanisms and Performance Optimization

  • 期刊论文

  • 发表日期：

    2026年2月27日

查看全文
  • Bao Liu,
  • Weihua Liu,
  • Song Lai,
  • Xinyue Zhang,
  • Xinyu Deng

摘要

Non-occupying coatings (NOCs) technology employs a “coating-first, molding-second” process, where a curable coating is applied to a pattern and transferred upon demolding to form the mold/core surface, enabling precise geometry replication and defect elimination. This demands superior coating properties, including stability, rheology, and bond strength. Silica fume—an ultrafine powder with high specific surface area and silanol groups—is a promising yet poorly understood reinforcement for NOCs. This study demonstrates that silica fume acts through a triple mechanism: rheological control, structural densification, and interfacial reinforcement. At 3 wt%, it increases brushing index by 66.7% with full suspensibility; at 2 wt%, it reduces liquid carrier demand by 11.8%, halves drying time, and enhances thermal stability. Wear resistance improves by 50.6% via densification, while a synergistic hydrogen–chemical bonding mechanism boosts coating–sand bond strength by 130% (to 182 kPa). These insights guide the design of high-performance NOCs.