Liquid Phase Processing and Synthesis at Very High Temperatures

极高温度下的液相加工和合成

• 批准号: 9061168
• 负责人: J.K. Richard Weber
• 金额: $ 4.95万
• 依托单位: Intersonics, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-01 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9061168&HistoricalAwards=false
• 关键词: Liquid; Phase; Processing; Synthesis; Very

Liquid phase processing of ceramics, glass, semiconductors, and oxide superconductors provides a route to producing useful forms of these materials which is often blocked by reaction with containers. This research explores a novel containerless processing method for these materials. Heterogeneous nucleation at container surfaces would be eliminated to enable synthesis of amorphous materials and improve control of single crystal growth. The containerless processing method uses relatively large aerodynamic forces and smaller acoustic positioning forces to achieve stable levitation of radiantly heated liquids. Stable acoustic levitation of low density liquids such as water, as well as aerodynamic levitation of dense solids, are well developed methods. Application of the proposed hybrid technique to dense solid materials has also been demonstrated in preliminary experiments under conditions for which aerodynamic levitation is not, by itself, stable. The proposed Phase I research develops to maintain levitation stability during melting, demonstrates operation with selected ceramic materials (e.g., aluminum oxide, oxide superconductors, fluoride glasses), and determines the designs and operating procedures for Phase II processing and materials property research.***//

陶瓷、玻璃、半导体的液相加工， 氧化物超导体提供了一种生产有用形式的途径， 这些物质的反应通常会被阻止， 容器. 本研究探讨了一种新型的无容器 这些材料的加工方法。 异相成核 在容器表面将被消除， 非晶材料和改善单晶生长的控制。 无容器处理方法使用相对大的 空气动力和较小的声学定位力， 实现辐射加热液体的稳定悬浮。 稳定 低密度液体如水的声悬浮 如稠密固体的空气动力学悬浮， 方法. 应用所提出的混合技术， 固体材料也已初步证明， 实验条件下，空气动力悬浮是 本身并不稳定。 拟议的第一阶段研究开发 为了在熔化过程中保持悬浮稳定性， 使用选定的陶瓷材料（例如，氧化铝， 氧化物超导体，氟化物玻璃），并确定 第二阶段处理的设计和操作程序， 材料性能研究。*//