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	定向凝固藕状多孔Si的孔结构(英文)
	杨倩倩 ; 刘源 ; 李言祥 ; 张言 ; Qian-qian YANG ; Yuan LIU ; Yan-xiang LI ; Yan ZHANG
	2016-03-30 ; 2016-03-30
关键词	藕状多孔Si 凝固速率 氢气压力 过热度 孔长度 lotus-type porous silicon solidification speed hydrogen pressure superheat degree pore length TB383.4 TG24
其他题名	Pore structure of unidirectional solidified lotus-type porous silicon
中文摘要	采用定向凝固的方法,在一定的氢压条件下制备具有长孔结构的藕状多孔Si。通过调整凝固速率和氢气压力,铸锭的孔隙率、孔径和孔长度能够得到有效控制。实验结果表明:当其他条件不变时,铸锭的面孔隙率几乎不随凝固速率发生变化,但随着氢气压力的增加而逐渐降低。采用理论模型获得的不同氢压条件下制备出的铸锭体孔隙率预测结果与实验结果吻合较好。随着凝固速率和氢气压力的降低,铸锭的平均孔长度和孔径均逐渐增加,长径比则基本保持不变。通过将熔体的过热度从200 K提高到300 K,制备得到的试样其平均孔径增加约0.3mm,平均孔长度从7 mm提高至24 mm,平均长径比则由8提高至20。; Lotus-type porous silicon with elongated pores was fabricated by unidirectional solidification under pressurized hydrogen. Porosity, pore diameter, and pore length can be adjusted by changing solidification speed and hydrogen pressure. The porosity of the ingot is nearly constant under different solidification speeds, but decreases with the increase of hydrogen pressure. The overall porosities of ingots fabricated at different hydrogen pressures were evaluated through a theoretical model. Findings are in good agreement with experimental values. The average pore diameter and pore length increase simultaneously while the average pore aspect ratio changes slightly with the decreases of solidification speed and hydrogen pressure. The average pore length is raised from 7 to 24 mm and the pore aspect ratio is raised from 8 to 20 respectively with the average pore diameter promoted by about 0.3 mm through improving the superheat degree of the melt from 200 to 300 K.
语种	英语 ; 英语
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/141741]
专题	清华大学
推荐引用方式 GB/T 7714	杨倩倩,刘源,李言祥,等. 定向凝固藕状多孔Si的孔结构(英文)[J],2016, 2016.
APA	杨倩倩.,刘源.,李言祥.,张言.,Qian-qian YANG.,...&Yan ZHANG.(2016).定向凝固藕状多孔Si的孔结构(英文)..
MLA	杨倩倩,et al."定向凝固藕状多孔Si的孔结构(英文)".(2016).

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