Fabrication of Lotus-type Porous Silicon by Unidirectional Solidification in Pressurized Hydrogen Atmosphere

摘要：

　　Lotus-type porous silicon is a promising micro-channel heat sink material in cooling of high powered electronic devices.Lotus-type porous silicon with elongated pores has been successfully fabricated by unidirectional solidification at different velocities.The average pore diameter and inter-pore spacing all increase whether along the height direction of the ingot or with increasing the thickness of graphite sheet (lower solidification velocity).The calculated porosity is in good agreement with the experimental results which almost keep as constant at different solidification velocities.The penetration ratio or the pore length increases with decreasing solidification velocity.The bigger pores are more likely to grow longer than smaller ones.In addition,the microstructure observation shows that the pores mostly distribute at the grain boundaries.

关键词： Lotus-type porous silicon Solidification velocity Porosity Pore diameter Penetrating ratio

作者: Qianqian Yang Yuan Liu Yanxiang Li

作者单位: Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 217-222

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）