Electromagnetic characteristics of square cold crucible designed for silicon preparation

• 作 者: Chen Ruirun Huang Feng Guo Jingjie Ding Hongsheng Yang Jieren Fu Hengzhi
• 机 构: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
• 出 处: 中国铸造
• 发表日期: 2011年2期
• 关键词: cold crucible magnetic flux density multicrystalline silicon electromagnetic cas

In the present work, the strength and distribution of electromagnetic field in the square cold crucible that designed for casting multicrystalline silicon were measured and analyzed by using a small coil method. The results show that in the perpendicular direction the maximum of magnetic flux density (B) appears at the position slightly above the middle of the coil, and then B attenuates toward both sides, and decreases more to the bottom of the crucible. In the horizontal direction, from the edge (cer) to the center, B firstly decreases gradually, and then slightly increases in the center. While along the inner sides of the crucible, the distribution is relatively uniform,especially in the effective acting range. B increases with the increasing of the input power. Moving the coil to the top of the crucible, B increases and the effective acting range of the electromagnetic field becomes bigger. For the coils with different tums, the five ts coil can induce the highest magnetic flux density.