Variational Principle of Ca Content in Cast Al-Si Alloy During Melting Process

Xiaohui Ao; Shuming Xing; Baishui Yu; Jiahong Zhang; Qiang Guo; Rufen Wang

doi:10.11896/j.issn.1005-023X.2017.010.019

Variational Principle of Ca Content in Cast Al-Si Alloy During Melting Process

Xiaohui Ao, Shuming Xing^*, Baishui Yu, Jiahong Zhang, Qiang Guo, Rufen Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The influence of temperature and time on variational principle of Ca content in A356 recycled scrap during melting process was investigated. The results indicated that the variations of Ca content showed conic laws which kept decreasing gradually with the holding time. The change rates of Ca content increased linearly at low temperature and decreased linearly at high temperature. With the melting temperature increasing, the decrease rates of Ca content sped up and the Ca content reached the lowest value (6×10^-6) within 3 hours at 760℃. By thermodynamic and kinetic analysis, we learned Ca content was reduced mainly by oxidation in first stage and deoxidizing Al₂O₃ through diffusion to the melt surface lately. The reaction started with alumina would be shorter when the temperature was improved. The oxidation rate of Ca changes with temperature, which meet the law of K=578 749exp[-176 500/(RT)] in the early melting process at 660-720℃.

Original language	English
Pages (from-to)	92-95 and 100
Journal	Cailiao Daobao/Materials Review
Volume	31
Issue number	5
DOIs	https://doi.org/10.11896/j.issn.1005-023X.2017.010.019
Publication status	Published - 25 May 2017
Externally published	Yes

Keywords

Ca content
Dynamics
Holding time
Melting temperature
Thermodynamics

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10.11896/j.issn.1005-023X.2017.010.019

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title = "Variational Principle of Ca Content in Cast Al-Si Alloy During Melting Process",

abstract = "The influence of temperature and time on variational principle of Ca content in A356 recycled scrap during melting process was investigated. The results indicated that the variations of Ca content showed conic laws which kept decreasing gradually with the holding time. The change rates of Ca content increased linearly at low temperature and decreased linearly at high temperature. With the melting temperature increasing, the decrease rates of Ca content sped up and the Ca content reached the lowest value (6×10-6) within 3 hours at 760℃. By thermodynamic and kinetic analysis, we learned Ca content was reduced mainly by oxidation in first stage and deoxidizing Al2O3 through diffusion to the melt surface lately. The reaction started with alumina would be shorter when the temperature was improved. The oxidation rate of Ca changes with temperature, which meet the law of K=578 749exp[-176 500/(RT)] in the early melting process at 660-720℃.",

keywords = "Ca content, Dynamics, Holding time, Melting temperature, Thermodynamics",

author = "Xiaohui Ao and Shuming Xing and Baishui Yu and Jiahong Zhang and Qiang Guo and Rufen Wang",

year = "2017",

month = may,

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doi = "10.11896/j.issn.1005-023X.2017.010.019",

language = "English",

volume = "31",

pages = "92--95 and 100",

journal = "Cailiao Daobao/Materials Review",

issn = "1005-023X",

publisher = "Cailiao Daobaoshe/ Materials Review",

number = "5",

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TY - JOUR

T1 - Variational Principle of Ca Content in Cast Al-Si Alloy During Melting Process

AU - Ao, Xiaohui

AU - Xing, Shuming

AU - Yu, Baishui

AU - Zhang, Jiahong

AU - Guo, Qiang

AU - Wang, Rufen

PY - 2017/5/25

Y1 - 2017/5/25

N2 - The influence of temperature and time on variational principle of Ca content in A356 recycled scrap during melting process was investigated. The results indicated that the variations of Ca content showed conic laws which kept decreasing gradually with the holding time. The change rates of Ca content increased linearly at low temperature and decreased linearly at high temperature. With the melting temperature increasing, the decrease rates of Ca content sped up and the Ca content reached the lowest value (6×10-6) within 3 hours at 760℃. By thermodynamic and kinetic analysis, we learned Ca content was reduced mainly by oxidation in first stage and deoxidizing Al2O3 through diffusion to the melt surface lately. The reaction started with alumina would be shorter when the temperature was improved. The oxidation rate of Ca changes with temperature, which meet the law of K=578 749exp[-176 500/(RT)] in the early melting process at 660-720℃.

AB - The influence of temperature and time on variational principle of Ca content in A356 recycled scrap during melting process was investigated. The results indicated that the variations of Ca content showed conic laws which kept decreasing gradually with the holding time. The change rates of Ca content increased linearly at low temperature and decreased linearly at high temperature. With the melting temperature increasing, the decrease rates of Ca content sped up and the Ca content reached the lowest value (6×10-6) within 3 hours at 760℃. By thermodynamic and kinetic analysis, we learned Ca content was reduced mainly by oxidation in first stage and deoxidizing Al2O3 through diffusion to the melt surface lately. The reaction started with alumina would be shorter when the temperature was improved. The oxidation rate of Ca changes with temperature, which meet the law of K=578 749exp[-176 500/(RT)] in the early melting process at 660-720℃.

KW - Ca content

KW - Dynamics

KW - Holding time

KW - Melting temperature

KW - Thermodynamics

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U2 - 10.11896/j.issn.1005-023X.2017.010.019

DO - 10.11896/j.issn.1005-023X.2017.010.019

M3 - Article

AN - SCOPUS:85042722377

SN - 1005-023X

VL - 31

SP - 92-95 and 100

JO - Cailiao Daobao/Materials Review

JF - Cailiao Daobao/Materials Review

IS - 5

ER -

Variational Principle of Ca Content in Cast Al-Si Alloy During Melting Process

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Keywords

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