- 作者: Ching-Jang Lin, Wen-Cheng J. Wei,Takashi Iwai, Chu-Wan Hong, Peter Greil
- 中文摘要: Fine Al2O3 particles are likely to form granules in a fluidizing reactor due to the interaction of several acting forces. The discrete element method (DEM) was employed to simulate the particle interactions in a fluidizing bed. The simulation results reveal that the granules floated and collided with the boundary walls or each other. The breakdown of soft granules under specified impingement angles and velocities is presented in order to reveal the fundamentals governing the adhesive strength of the granules. The criteria obtained from the simulation are compared with experimental results of studies on adhesive strength and the microstructures of four granules with various densities. The adhesive strength of granules was measured by means of a materials testing system (MTS). The detailed microstructures of the Mo/Al2O3 composite powders were analyzed by using SEM/TEM/EPMA techniques. The morphologies show that the Mo-species diffused into sub-micron capillaries in the granules during the MOCVD fluidization process and appeared in concentrations as high as 24 wt% in Al2O3 granules.
- 英文摘要: --
- 中文關鍵字: DEM simulation, nano-composite, MOCVD, fluidizing bed, alumina, molybdenum
- 英文關鍵字: --