等轴晶在过热溶液落管中的下落熔化特性研究

周鹏; 王猛; 林鑫; 陈磊; 邱丰; 黄卫东

doi:10.7498/aps.62.018105

摘要

研究了NH4Cl等轴晶在过热NH4Cl-70 wt%H2O溶液落管内熔化中的形貌演化过程, 并分析了溶液过热度及等轴晶初始尺寸对其下落速度和熔化速率的影响规律和机理. 结果表明: 等轴晶在过热溶液中下落时, 若不发生旋转, 其形貌由准轴对称形貌演变成非轴对称准三角形貌;若发生旋转, 则有助于保持其准轴对称形貌. 通过分析不同条件下等轴晶下落时的阻力系数, 认为提高溶液过热度可获得更为光顺的等轴晶外形, 增大其下落速度. 等轴晶初始尺寸越大, 其形貌复杂性提升及下落速度增大, 会导致熔化速率加快. 在等轴晶下落熔化的过程中, 逐渐减小的下落速度减弱了界面前沿对流传质条件, 使得单个等轴晶的熔化速率基本保持恒定.

关键词:

Abstract

The morphology evolution of NH4Cl equiaxed crystal settling in a falling tube filling with its superheated aqueous solution is studied. The effects of superheating and initial crystal size on settling rate and melting velocity are analyzed. The results show that for a non-spinning equiaxed crystal, it will transform from a "quasi-symmetrical" morphology to "quasi-delta" morphology, and for a spinning equiaxed crystal, it is more likely to sustain its initial "quasi-symmetrical" morphology. By analyzing the drag coefficients of equiaxed crystals settling in the solution at different superheating degrees, it is found that higher superheating leads to a smoother shape of the equiaxed crystal, thus increasing its settling rate. For a large equiaxed crystal, higher complexity in shape and increase in settling velocity will lead to a higher melting velocity. In the settling process of crystal in superheated melt, the solute transport condition on the melting interface is weakened by the gradually reducing the settling velocity, resulting in a relatively steady melting velocity for a certain equiaxed crystal.

Keywords:

作者及机构信息

1.
西北工业大学凝固技术国家重点实验室, 西安 710072

基金项目: 国家重点基础研究发展计划(批准号: 2011CB610402)、国家自然科学基金(批准号: 50901061, 50971102) 和凝固技术国家重点实验室 (西北工业大学) 自主经费(批准号: 02-TZ-2008, 36-TP-2009)资助的课题.

Authors and contacts

1.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Funds: Project supported by the National Basic Research Program of China (Grant No. 2011CB10402), the National Natural Science Foundation of China (Grant Nos. 50901061, 50971102) and the Foundation of State Key Laboratory of Solidification Processing, China (Grant Nos. 02-TZ-2008, 36-TP-2009).

参考文献

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[2]	Yeh J W, Jong S H, Liu W P 1996 Metall. Mater. Trans. A 27 1933
[3]	Biloni H, Chalmers B 1968 J. Mater. Sci. 3 139
[4]	Murakami K, Okamoto T 1984 Mater. Sci. Technol. 18 103
[5]	Fleming M C 1974 Metall. Mater. Trans. B 5 2121
[6]	Ohno A (Translated by Xing J D) 1990 Solidification of Metals: Theory, Practice and Application (Beijing: China Machine Press) pp30-33 (in Chinese) [大野笃美著, 邢建东译 1990 金属的凝固理论、实践及应用 (北京: 机械工业出版社) 第30–33页]
[7]	Hu H Q 1999 The Principle of Solidification in Metals (Beijing: China Machine Press) p206 (in Chinese) [胡汉起 1999 金属凝固原理 (北京: 机械工业出版社) 第206页]
[8]	Andrew D, Thomas N 2007 J. Cryst. Growth 300 467
[9]	Blackmore K A, Beatty K M, Hui M J 1997 J. Cryst. Growth 174 76
[10]	Ramani A, Beckermann C 1997 Scripta Mater. 36 633
[11]	Hisao E, Yuhko I, Kei S, Manabu T 1995 ISIJ Int. 46 864
[12]	Tan F L 2005 Appl. Therm. Eng. 25 2169
[13]	Hansen G, Liu S, Lu S Z, Hellawell A 2002 J. Cryst. Growth 234 731
[14]	Shi Y F, Xu Q Y , Liu B C 2011 Acta Phys. Sin. 60 126101 (in Chinese) [石玉峰, 徐庆彦, 柳百成 2011 60 126101 ]
[15]	Loth E 2008 Powder Technol. 182 342
[16]	Mirihanage W U, Browne D J 2010 Comput. Mater. Sci. 50 260
[17]	Cheng N S 2009 Powder Technol. 189 395
[18]	Hölzer A, Sommerfeld M 2008 Powder Technol. 184 361
[19]	Zhang Q Y, Peng Z, He R, Liu R, Lu Q, Hou M Y 2007 Acta Phys. Sin. 56 4708 (in Chinese) [张权义, 彭政, 何润, 刘锐, 陆坤全, 厚美瑛 2007 56 4708]
[20]	Chhabra R P 1995 Powder Technol. 85 83
[21]	Beckermann C, de Groh III H C, Weidman P D, Zakhem R, Ahuja S 1993 Metall. Mater. Trans. B 24 749
[22]	Zhang Z X, Dong C N 1998 Viscous Fluid Flow ( Beijing: Tsinghua University Press) pp5-8 (in Chinese) [章梓雄, 董曾南 1998 黏性流体力学 (北京: 清华大学出版社) 第5–8页]
[23]	Badillo A, Ceynar D, Beckermann C 2007 J. Cryst. Growth 309 197
[24]	Beckermann C, Wang C Y 1996 Metall. Mater. Trans. A 27 2784
[25]	Simões S, Sousa A, Figueiredo M 1996 Int. J. Pharm. 127 283
[26]	Badillo A, Ceynar D, Beckermann C 2007 J. Cryst. Growth 309 197

施引文献

[1]	Zhang G Y, Zhang H, Liu C M, Zhou Y J 2005 Acta Phys. Sin. 54 1771 (in Chinese) [张国英, 张辉, 刘春明, 周永军 2005 54 1771]
[2]	Yeh J W, Jong S H, Liu W P 1996 Metall. Mater. Trans. A 27 1933
[3]	Biloni H, Chalmers B 1968 J. Mater. Sci. 3 139
[4]	Murakami K, Okamoto T 1984 Mater. Sci. Technol. 18 103
[5]	Fleming M C 1974 Metall. Mater. Trans. B 5 2121
[6]	Ohno A (Translated by Xing J D) 1990 Solidification of Metals: Theory, Practice and Application (Beijing: China Machine Press) pp30-33 (in Chinese) [大野笃美著, 邢建东译 1990 金属的凝固理论、实践及应用 (北京: 机械工业出版社) 第30–33页]
[7]	Hu H Q 1999 The Principle of Solidification in Metals (Beijing: China Machine Press) p206 (in Chinese) [胡汉起 1999 金属凝固原理 (北京: 机械工业出版社) 第206页]
[8]	Andrew D, Thomas N 2007 J. Cryst. Growth 300 467
[9]	Blackmore K A, Beatty K M, Hui M J 1997 J. Cryst. Growth 174 76
[10]	Ramani A, Beckermann C 1997 Scripta Mater. 36 633
[11]	Hisao E, Yuhko I, Kei S, Manabu T 1995 ISIJ Int. 46 864
[12]	Tan F L 2005 Appl. Therm. Eng. 25 2169
[13]	Hansen G, Liu S, Lu S Z, Hellawell A 2002 J. Cryst. Growth 234 731
[14]	Shi Y F, Xu Q Y , Liu B C 2011 Acta Phys. Sin. 60 126101 (in Chinese) [石玉峰, 徐庆彦, 柳百成 2011 60 126101 ]
[15]	Loth E 2008 Powder Technol. 182 342
[16]	Mirihanage W U, Browne D J 2010 Comput. Mater. Sci. 50 260
[17]	Cheng N S 2009 Powder Technol. 189 395
[18]	Hölzer A, Sommerfeld M 2008 Powder Technol. 184 361
[19]	Zhang Q Y, Peng Z, He R, Liu R, Lu Q, Hou M Y 2007 Acta Phys. Sin. 56 4708 (in Chinese) [张权义, 彭政, 何润, 刘锐, 陆坤全, 厚美瑛 2007 56 4708]
[20]	Chhabra R P 1995 Powder Technol. 85 83
[21]	Beckermann C, de Groh III H C, Weidman P D, Zakhem R, Ahuja S 1993 Metall. Mater. Trans. B 24 749
[22]	Zhang Z X, Dong C N 1998 Viscous Fluid Flow ( Beijing: Tsinghua University Press) pp5-8 (in Chinese) [章梓雄, 董曾南 1998 黏性流体力学 (北京: 清华大学出版社) 第5–8页]
[23]	Badillo A, Ceynar D, Beckermann C 2007 J. Cryst. Growth 309 197
[24]	Beckermann C, Wang C Y 1996 Metall. Mater. Trans. A 27 2784
[25]	Simões S, Sousa A, Figueiredo M 1996 Int. J. Pharm. 127 283
[26]	Badillo A, Ceynar D, Beckermann C 2007 J. Cryst. Growth 309 197

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