• 作者： Chen, Hsi-Kuei; Lin, Chun-I
• 中文摘要： 本研究報告碳熱還原三氧化二鋁製備氮化鋁之數學模式。我們以區域模式模擬諾森擴散反應系統。在模擬過程中考慮了化學反應速率、氣體擴散率及氣體薄膜阻力對反應速率所造成的影響。我們將數學模式進一步無因次化後得到σ/sup 2/、β/sub 1/、β/sub 2/、γ和N/sub SH/五個無因次常數。我們發現反應速率會隨著降低σ/sup 2/或β/sub 1/值或增加β/sub 2/、γ和N/sub SH/值而加快。此外我們還發現當系統位於分子擴散範圍內其反應速率較位於諾森擴散範圍者快。
• 英文摘要： A mathematical model has been proposed for describing the nitridation of carbon/aluminium oxide pellet in a stream of nitrogen. Based on the model, dimensionless governing e-quations were derived to represent the system in Knudsen diffusion region. Effects of the following five parameters on the conversion of solid C and yield of solid E have been examined: the reaction/diffusion ratio .sigma./ sup 2/, the reactivity ratios .beta./sub 1/ and .beta./sub 2/, the reactant amount ratio .grmma. and the Sherwood number N/sub sh/. The reaction was found to be enhanced when the values of .sigma./sup 2/ or .beta./sub 1/ were decreased, or the values of .beta./sub 2/,.grmma. or N/sub sh/, were increased. The reaction rate was also found to be increased by preparing the solid sample in a powder form instead of pellet form.
• 中文關鍵字： 數學模式; 碳熱還原氮化反應; 三氧化二鋁; 諾森擴散
• 英文關鍵字： Mathematical Model; Carbothermic Nitridation; Aluminium Oxide; Knudsen Diffusion