铸造铝硅合金熔炼过程中Ca含量的变化规律*

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

材料导报编辑部

2017, Vol. 31

Issue (10): 92-95 https://doi.org/10.11896/j.issn.1005-023X.2017.010.019

材料研究

铸造铝硅合金熔炼过程中Ca含量的变化规律*

敖晓辉¹,邢书明¹,于佰水¹,张佳虹¹,郭强²,王如芬²

1 北京交通大学机械与电子控制工程学院, 北京 100044;
2 天津立中合金集团有限公司, 天津 300457

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

AO Xiaohui¹, XING Shuming¹, YU Baishui¹, ZHANG Jiahong¹, GUO Qiang², WANG Rufen²

1 School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044;
2 Tianjin Lizhong Alloy Group Co.,Ltd. Tianijin 300457

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摘要以A356回炉料为对象,研究了熔炼温度和保温时间对Ca含量的变化规律。结果表明:Ca含量随着保温时间延长以二次曲线规律逐渐下降,低温时下降速率线性增大,高温时下降速率线性减小。当熔炼温度升高,Ca含量下降速率加快,在760 ℃熔炼时只经过3 h就能达到最低含量6×10-6。通过热力学和动力学分析可知,[Ca]主要通过前期被氧化和中后期扩散至熔体表层还原氧化铝的方式降低。温度越高,[Ca]与氧化铝开始反应的时间越短。在660~720 ℃熔炼初期,Ca氧化速率随温度变化满足K=578 749exp[-176 500/(RT)]规律。

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	敖晓辉
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关键词: Ca含量熔炼温度保温时间热力学动力学

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 ℃.

Key words: Ca content melting temperature holding time thermodynamics dynamics

发布日期: 2018-05-08

ZTFLH:

TF801.3

基金资助: *国家863计划(2014AA041804)

通讯作者: 邢书明,男,1962年生,教授,博士研究生导师,主要研究方向为金属材料先进成型技术E-mail:smxing@bjtu.edu.cn

作者简介: 敖晓辉:男,1986年生,博士研究生,主要研究方向为铝合金熔铸工艺E-mail:14116361@bjtu.edu.cn

引用本文:

敖晓辉,邢书明,于佰水,张佳虹,郭强,王如芬. 铸造铝硅合金熔炼过程中Ca含量的变化规律*[J]. 材料导报编辑部, 2017, 31(10): 92-95.
AO Xiaohui, XING Shuming, YU Baishui, ZHANG Jiahong, GUO Qiang, WANG Rufen. Variational Principle of Ca Content in Cast Al-Si Alloy During Melting Process. Materials Reports, 2017, 31(10): 92-95.

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https://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.010.019 或 https://www.mater-rep.com/CN/Y2017/V31/I10/92

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