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Unidirectional Solidification of Solar Grade Silicon and lmpurities and Themal Stress Control of the Cast

太阳能级硅及杂质的单向凝固及铸件的热应力控制

基本信息

批准号：
11694128
负责人：
KAGAWA Yutaka
金额：
$ 5.63万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11694128/
关键词：
silicon solar cell electron beam melting vacuum melting coagulation refinement simulation continuous casting residual stress 電子b-ム応力シュミレーション

项目摘要

It is known that the quality of the silicon ingot made by the casting method is greatly influenced by the residual stress which exists in the material after solidification. However, the correct measuring method for the residual stress and the evaluating method of the result has not been established enough. The object of this research is to examine the measurement of the residual stress and the relation between the generation situation and the casting process in detail by international cooperation. Silicon was continuously cast with a equipment device that was installed in the Institute of Industrial Science, The University of Tokyo. Samples were made with different casting conditions and the residual stress of these silicon ingots were measured by mean of the neutron diffraction in the Canadian National Atomic Energy Research Institute, Chalk River, Canada. Because of the larger size of the crystal grains in the continuous cast silicon ingots, the measurement of the amount of the strai … More n was difficult with the conventional technique. New measurement technique was developed on the Canadian side, in which isotropy was given with rotating the sample while the neutron diffraction was measuring and was applied to the silicon ingot The model for the estimation of the residual stress of the silicon after continuous cast was developed on The University of Tokyo side. With this model, based on the heat conduction equation and the heat of coagulation, the analysis was done with actual process condition as the boundary condition. This result was compared with the experimental result mentioned above and discussed. In addition, for the shortening the calculation time and further establishment of general calculation technique, new version of the analytical approximation method is developing When the new version is completed, it will be possible to apply it for the online process monitoring of the manufacturing of the silicon continuous cast ingot Furthermore, a larger scale equipment were completed, that was not only the scale improvement of the smaller electron-beam equipment, but a number of improvements were made. By the large scaled electron-beam dissolution equipment, which has two electron beams generators and a large size water-cooled copper hearth, the experiments of silicon refining was performed. The experimental result was success of making 30kg class large-scale silicon ingots Less

众所周知，通过铸造方法制造的硅锭的质量很大程度上受到凝固后存在于材料中的残余应力的影响。然而，对残余应力的正确测量方法和结果的评价方法还没有建立起来。本研究的目的是通过国际合作，对残余应力的测量以及残余应力的产生情况与铸造工艺之间的关系进行详细的研究。利用东京大学工业科学研究所的设备装置连续铸造硅。在加拿大国家原子能研究所（Canadian National Atomic Energy Research Institute，Chalk River，Canada）用中子衍射法测量了不同铸造条件下的硅锭的残余应力。由于连续铸造硅锭中晶粒尺寸较大，应变量的测量在实际生产中有很大的困难。 ...更多信息用常规技术很难。加拿大方面开发了新的测量技术，在中子衍射测量的同时旋转样品给出各向同性，并应用于硅锭。东京大学方面开发了估计连续铸造后硅的残余应力的模型。该模型以热传导方程和凝固热为基础，以实际工艺条件为边界条件进行分析。并与上述实验结果进行了比较和讨论。此外，为了缩短计算时间和进一步建立通用计算技术，正在开发新版本的解析近似法。新版本完成后，将有可能将其应用于硅连续铸锭制造的在线过程监控。此外，一个更大规模的设备已经完成，这不仅是小型电子束设备的规模改进，而且还进行了许多改进。利用具有两台电子束发生器和大型水冷铜炉的大型电子束溶解装置进行了硅精炼实验。实验结果成功地试制了30公斤级大型硅锭。