RIMI: Process Simulation and Design of Magnetic Czochralski Bulk Crystal Growth

蒙托亚新墨西哥州立大学（NMSU）化学工程系正在提出一项计划，以发展少数民族学生和教师的技术和专业技能。该研究计划的重点是开发一种经过验证的过程模拟模型，该模型是磁性Czochralski工艺，这是种植大块晶体最常用的商业工艺。磁场稳定了金属液相中的对流和湍流；通过生产几乎没有缺陷的均匀晶体，查克拉尔斯基工艺从这种增加的稳定性中受益。与建模任务相结合的是对固体-液体系统的热力学和输运性质进行可靠的估计。此外，将获得对该过程（尽管是当前非磁性过程）的完整实验理解，以验证模型。在使用纯材料对实验装置进行充分表征后，该计划将开始研究仅通过薄膜生长成功生长的材料，如氮化镓，一种宽带隙半导体，当与二极管结合时，能够发出可见的蓝光。一个成功的研究项目的结果将是引入新的加工技术和新材料进入工业，以及创造新的方法来种植大量的工业重要的半导体和陶瓷。将为少数民族学生和教员的培训开发资源。少数民族研究生和本科生将直接参与研究，与国家高磁场实验室的合作将鼓励发展外部联系，以促进职业发展。结果的公布将加强RIMI项目和新密西根州立大学的声誉。计算设施和实验设备将被添加到新密歇根州立大学工程学院，提供的设施将有助于获得进一步的资助，以维持当前和未来的研究。本提案所采用的理论工作的性质，工业感兴趣的晶体系统的数量，以及对磁场辅助材料加工研究的缺乏，将使该计划在未来很好地维持下去。＊＊＊

9550759 Montoya The Chemical Engineering Department at New Mexico State University (NMSU) is proposing a program to develop the technical and professional skills of minority students and faculty. The focus of the research program is development of a validated process simulation model of the magnetic Czochralski process, the most frequently used commercial process for growing large bulk crystals. Magnetic fields stabilize convection and turbulent flow in the metallic liquid phase; the Czochralski process benefits form this increased stability by producing uniform crystals with few defects. Coupled to the modeling task is development of reliable estimates of the thermodynamic and transport properties of the solid-liquid system. Also, a complete experimental understanding of the process (albeit, the non-magnetic process at the current time) will be obtained to verify the model. After full characterization of the experimental apparatus using pure materials, this initiative will begin investigations of materials that have been successfully grown only by thin-film growth, such as gallium nitride, a wide-band-gap semiconductor which, when incorporated into a diode, is capable of emitting visible blue light. The outcome of a successful research program will be the introduction of new processing techniques and novel materials into industry, as well as creating new methods to grow large quantities of ildustrially important semiconductors and ceramics. Resources will be developed for minority student and faculty training. Minority graduate and undergraduate students will be directly involved with the research, and collaboration with the National High Magnetic Field Laboratory will encourage the development of external contacts for career development. Publication of results will strengthen the reputation of both the RIMI program and NMSU. Computing facilities and experimental equipment will be added to the NMSU College of Engineering, providing facilities that wil l aid in obtaining further grants to sustain current and future research. The nature of the theoretical work employed in this proposal, the number of crystalline systems that are of interest to industry, and the lack of research into magnetic-field assisted materials processing will sustain this program well into the future. ***