Study on the Effect and Mechanism of Mold Temperature and Ceramic Particle Alumina on the Strength and Water Solubility of NaCl–Na2CO3 and NaCl–Na2SO4 Composite Cores

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Xiaorou Ning, Keke Zuo, Yang Li, Wanting Guo, Xiao Peng, Jianguo Su, Lai Song, Weihua Liu, Tongyu Liu, Yuyan Ren
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Abstract

In the process of pouring salt cores, it is crucial to select the appropriate mold temperature, which is essential for the shaping and strength of the salt cores. Additionally, salt cores need to undergo water-soluble cleaning after casting, which has certain requirements for their water solubility. In order to obtain composite water-soluble salt cores with a certain strength suitable for high-pressure die casting processes, sodium chloride, sodium sulfate, and sodium carbonate are used as salt core materials, with ceramic alumina particles as reinforcement materials. The influence of alumina on the performance of NaCl–Na2CO3 and NaCl–Na2SO4 composite salt cores was studied. Through molecular dynamics simulation calculations, the change curve of the adhesion work of salt cores at different mold temperatures was analyzed. Combining XRD detection results and comparative analysis of actual salt core flexural strength, it was found that sodium aluminate generated at high temperatures has a strong interface binding ability with other components in the salt core, which is a key factor affecting the strength of the salt core. Through experimental research combined with simulated calculations of water molecule adsorption at different salt core interfaces, it was found that with increasing water temperature, the water adsorption capacity of NaCl–Na2CO3 and NaCl–Na2SO4 salt cores gradually increases, leading to an accelerated water solubility rate. The addition of Al2O3 reduces the water solubility rate of NaCl–Na2CO3 and NaCl–Na2SO4 salt cores, but significantly improves their strength. The addition of Al2O3 enhances the NaCl–Na2CO3 salt core due to the formation of highly water-soluble sodium aluminate, resulting in a certain improvement in water solubility rate.

Abstract Image

模具温度和陶瓷颗粒氧化铝对 NaCl-Na2CO3 和 NaCl-Na2SO4 复合芯材强度和水溶性的影响及机理研究
在浇注盐芯的过程中,选择合适的模具温度至关重要,这对盐芯的成型和强度至关重要。此外,盐芯在浇注后需要进行水溶性清洗,这对盐芯的水溶性有一定的要求。为了获得适合高压压铸工艺的、具有一定强度的复合水溶性盐芯,我们采用氯化钠、硫酸钠和碳酸钠作为盐芯材料,氧化铝陶瓷颗粒作为增强材料。研究了氧化铝对 NaCl-Na2CO3 和 NaCl-Na2SO4 复合盐芯性能的影响。通过分子动力学模拟计算,分析了不同模温下盐芯附着功的变化曲线。结合 XRD 检测结果和实际盐芯抗折强度对比分析,发现高温下生成的铝酸钠与盐芯中其他成分具有很强的界面结合能力,是影响盐芯强度的关键因素。通过实验研究结合不同盐核界面的水分子吸附模拟计算发现,随着水温的升高,NaCl-Na2CO3 和 NaCl-Na2SO4 盐核的水吸附能力逐渐增强,导致水溶解速率加快。加入 Al2O3 会降低 NaCl-Na2CO3 和 NaCl-Na2SO4 盐核的水溶解速率,但会显著提高其强度。加入 Al2O3 后,由于形成了高水溶性的铝酸钠,NaCl-Na2CO3 盐芯的水溶性得到了一定程度的提高。
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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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