- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Floating zone furnace equipped with a high power laser of 1kW composed of five smart beams
摘要： A floating zone furnace is a powerful tool for single crystal growth. Here, we report the floating zone furnace using a high power diode laser of 1kW composed of five 200 Watt heating beams. The five beams with the designed irradiation intensity distribution enable the melt-growth of single crystals for refractory materials having a high melting temperature above 2000°C, volatile materials and even incongruent materials. The power of five beams in the horizontal plane provides uniform intensity in the outer circumference of the raw material rods, while the vertical direction power of five beams can be made to have a bell shape irradiation intensity so as to relax residual thermal stress in the grown single crystal. The present furnace enables one to directly monitor the temperature of the hot spot of raw material and the molten zone within a 1 mm diameter. Such an in-situ monitoring function of the temperature on the molten zone greatly enhances the controllability for optimizing the crystal growth condition.
关键词： B1. Oxides, Sulfides, Tellurides, Manganites, Borates, Chalcognites,A2. Floating zone technique;,B3. Laser diodes
更新于2025-09-12 10:27:22
-
Elusive super-hard B6C accessible through the laser-floating zone method
摘要： Boron carbide is among the most promising ceramic materials nowadays: their mechanical properties are outstanding, and they open potential critical applications in near future. Since sinterability is the most critical drawback to this goal, innovative and competitive sintering procedures are attractive research topics in the science and technology of this carbide. This work reports the pioneer use of the laser-floating zone technique with this carbide. Crystallographic, microstructural and mechanical characterization of the so-prepared samples is carefully analysed. One unexpected output is the fabrication of a B6C composite when critical conditions of growth rate are adopted. Since this is one of the hardest materials in Nature and it is achievable only under extremely high pressures and temperatures in hot-pressing, the use of this technique offers a promising alternative for the fabrication. Hardness and elastic modulus of this material reached to 52 GPa and 600 GPa respectively, which is close to theoretical predictions reported in literature.
关键词： mechanical properties,microstructure,superhard materials,laser-floating zone technique,Boron carbide
更新于2025-09-12 10:27:22
-
Reference Module in Materials Science and Materials Engineering || Monocrystalline Silicon Grown Using Floating Zone Technique ☆
摘要： The floating zone technique is the best method available for producing monocrystalline Si ingot from polycrystalline Si with the lowest amount of impurity, defect and highest resistivity. However, there are many parameters that needed to be optimised in the process to ensure high quality crystals can be produced starting from the raw materials involved, the melting and solidification rate, the surrounding atmosphere and the capability of the equipment and parts used. Without optimization, the produced Si would not be of higher quality compared to crystals produced by Czochralski and directional solidification method and it would be a waste of resources since the costs involved are much higher for the FZ technique. However, with the evolution in technology, the high cost that is associated with FZ technique and the limitation in size of ingot that can be produced will someday be solved.
关键词： Silicon Ingot,Monocrystalline Silicon,Directional Solidification,Czochralski,Floating Zone Technique
更新于2025-09-10 09:29:36