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The role of carbonaceous materials in mold powder and influence on melting behavior

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Abstract

In this study, a hot stage microscope, thermogravimetry–differential scanning calorimetry (TG-DSC), and a scanning electron microscope were used to study the role of carbonaceous materials in mold powder and their influence on the melting process. It was found that carbon black has a good isolation effect in mold powder. It delayed the solid-state reaction between the raw materials and increased the softening and hemispherical temperatures of the mold powder. Moreover, the steric hindrance effect of carbon black led to the formation of irregular 2CaO·SiO2 crystals in the solid-state reaction and a significant increase in the flow temperature that exceeded the 30 ℃ error limit of the current standard. The TG-DSC thermal analysis shows that during the heating process of mold powder with 15% graphite, the exothermic combustion of graphite accelerated the decomposition reaction of Na2CO3 and Li2CO3, promoted the melting of mold powder, and decreased the softening and hemispherical temperatures. However, the decrease was smaller than 30 ℃, and there was no need to decarbonize the carbon before the melting range test.

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Acknowledgements

The authors wish to thank Chongqing University (in China) for the financial support.

Funding

This study was funded by Chongqing University (in China).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, No. 174 Shazhengjie, shapingba, Chongqing, 400044, China

    Fuhang Chen, Guanghua Wen, Ping Tang, Liang Yu & Funian Han

  2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, No. 174 Shazhengjie, shapingba, Chongqing, 400044, China

    Fuhang Chen, Guanghua Wen, Ping Tang & Funian Han

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  1. Fuhang Chen
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  2. Guanghua Wen
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  3. Ping Tang
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  4. Liang Yu
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  5. Funian Han
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Contributions

Fuhang Chen, Guanghua Wen, and Ping Tang contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Fuhang Chen, Liang Yu, and Funian Han. The first draft of the manuscript was written by Fuhang Chen and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Guanghua Wen.

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This is an observational study. The Research Ethics Committee has confirmed that no ethical approval is required.

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Chen, F., Wen, G., Tang, P. et al. The role of carbonaceous materials in mold powder and influence on melting behavior. J Therm Anal Calorim 147, 10965–10975 (2022). https://doi.org/10.1007/s10973-022-11361-0

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  • DOI: https://doi.org/10.1007/s10973-022-11361-0

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