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<p>To obtain a water-soluble salt core suitable for high-pressure die casting of aluminum alloys, alumina ceramic particles were used to reinforce the NaCl–Na<sub>2</sub>CO<sub>3</sub> binary salt core. In order to investigate the key role of alumina ceramic particles in improving the bending strength of salt cores, the results after the test were compared by changing the content and particle size of alumina ceramic particles, and the results showed that multi-particle size hybrid alumina particles played a key role in enhancing the bending strength of salt cores. 5% 400 mesh +15% 600 mesh alumina particles enhanced NaCl–Na<sub>2</sub>CO<sub>3</sub> composite salt core bending strength of 30&#xa0;MPa; on the one hand, 400 mesh alumina particles are more likely to react with sodium carbonate to generate sodium aluminate with greater work of adhesion; on the other hand, 600 mesh alumina particles more easily dispersed in the salt core, more distribution of 600 mesh alumina in the fracture, and better combination with sodium aluminate. The microstructure of the fracture of the salt core was observed and characterized by SEM and EDS, and it was found that sodium aluminate existed at the fracture to play the role of “adhesion,” and the generation of sodium aluminate improved the water solubility of the salt core. Comparing the cracking tendency of different salt core materials through the crack sensitivity test device, it is known that alumina particles play an important role in inhibiting crack generation and extension. Observation and characterization of the microstructure of the salt cores through SEM and EDS show that alumina particles play a role in filling, making up the shrinkage, and inhibiting the extension of cracks in the process of the preparation of the salt cores.</p>

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Study on the Effects and Mechanism of Multi-particle Size Hybrid Alumina Particles on the Strength, Water Solubility, and Cracking Tendency of NaCl–Na2CO3 Binary Salt Cores

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Yang Li,
  • Lai Song,
  • Weihua Liu,
  • Wei Cui,
  • Jingkai Zhang,
  • Yandong Yang,
  • Jungang Li,
  • Guangyu Chen

摘要

To obtain a water-soluble salt core suitable for high-pressure die casting of aluminum alloys, alumina ceramic particles were used to reinforce the NaCl–Na2CO3 binary salt core. In order to investigate the key role of alumina ceramic particles in improving the bending strength of salt cores, the results after the test were compared by changing the content and particle size of alumina ceramic particles, and the results showed that multi-particle size hybrid alumina particles played a key role in enhancing the bending strength of salt cores. 5% 400 mesh +15% 600 mesh alumina particles enhanced NaCl–Na2CO3 composite salt core bending strength of 30 MPa; on the one hand, 400 mesh alumina particles are more likely to react with sodium carbonate to generate sodium aluminate with greater work of adhesion; on the other hand, 600 mesh alumina particles more easily dispersed in the salt core, more distribution of 600 mesh alumina in the fracture, and better combination with sodium aluminate. The microstructure of the fracture of the salt core was observed and characterized by SEM and EDS, and it was found that sodium aluminate existed at the fracture to play the role of “adhesion,” and the generation of sodium aluminate improved the water solubility of the salt core. Comparing the cracking tendency of different salt core materials through the crack sensitivity test device, it is known that alumina particles play an important role in inhibiting crack generation and extension. Observation and characterization of the microstructure of the salt cores through SEM and EDS show that alumina particles play a role in filling, making up the shrinkage, and inhibiting the extension of cracks in the process of the preparation of the salt cores.