Scholarlink

<p>Pure Al is a promising material for thermal applications owing to its high thermal conductivity and anodizing capability. However, its inherently low fluidity limits its castability in high-pressure die casting (HPDC) processes, particularly for thin-walled and complex parts. In this study, a oxygen-replacing die casting (ORDC) method employing oxygen injection was applied to improve the fluidity and casting quality of pure Al. Pre-simulations using JMatPro confirmed that pure Al exhibited a narrower solidification range and significantly higher thermal conductivity than the conventional ADC12 alloy, highlighting casting challenges. Gravity casting experiments revealed that oxygen injection improved the melt flow, thereby extending the flow length by approximately 19% compared to that under conventional conditions. This improvement was attributed to localized heat generation from the exothermic reaction between molten Al and O<sub>2</sub>. Subsequent die casting trials using a 125 ton HPDC machine demonstrated that the ORDC method enabled stable filling of the 2–3&#xa0;mm sections at 680&#xa0;°C, although complete filling of the 1 mm thin-wall section required ≥&#xa0;700&#xa0;°C. Under these conditions, ORDC produced longer fill distances than both conventional and vacuum die casting. Moreover, porosity measurements based on density confirmed that incomplete filling degraded thermal performance, and tensile testing showed that the ORDC castings exhibited superior mechanical properties owing to improved melt fluidity and reduced porosity.</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

Fluidity Enhancement of Pure Aluminum Using Oxygen-Replacing Die Casting

  • 期刊论文

  • 发表日期：

    2025年9月23日

查看全文
  • Ho-jung Kang,
  • Ho-sung Jang,
  • Pil-hwan Yoon,
  • Gyu-heun Lee,
  • Joong-suk Roh,
  • Seong-rak Park,
  • Sun-mi Shin,
  • Jin-young Park

摘要

Pure Al is a promising material for thermal applications owing to its high thermal conductivity and anodizing capability. However, its inherently low fluidity limits its castability in high-pressure die casting (HPDC) processes, particularly for thin-walled and complex parts. In this study, a oxygen-replacing die casting (ORDC) method employing oxygen injection was applied to improve the fluidity and casting quality of pure Al. Pre-simulations using JMatPro confirmed that pure Al exhibited a narrower solidification range and significantly higher thermal conductivity than the conventional ADC12 alloy, highlighting casting challenges. Gravity casting experiments revealed that oxygen injection improved the melt flow, thereby extending the flow length by approximately 19% compared to that under conventional conditions. This improvement was attributed to localized heat generation from the exothermic reaction between molten Al and O2. Subsequent die casting trials using a 125 ton HPDC machine demonstrated that the ORDC method enabled stable filling of the 2–3 mm sections at 680 °C, although complete filling of the 1 mm thin-wall section required ≥ 700 °C. Under these conditions, ORDC produced longer fill distances than both conventional and vacuum die casting. Moreover, porosity measurements based on density confirmed that incomplete filling degraded thermal performance, and tensile testing showed that the ORDC castings exhibited superior mechanical properties owing to improved melt fluidity and reduced porosity.