• 作者： Li, Hung-Pin; Liu, Jenq
• 中文摘要： 本文以二硼化鈦(TiB/sub 2/)反應為例子,探討傳播燃燒合成(self-propagating high-temperature synthesis)和高能量碰撞(high energy milling)/機械合金化(mechanical alloying)之製成。在本文中,利用機械合金化之震動性,將用來反應的反應物震碎,使其粉末之顆粒變小,再將這些經過不同震動時間的粉末(不同顆粒大小),以傳播燃燒合成的方式合成材料,使其反應成為產物。本文主要討論不同震動時間對傳播燃燒合成的影響:我們發現震動時間的增加會減少反應物顆粒的大小,進而增加反應的溫度及速度。而我們也發現微小的二硼化鈦粉末也可直接由高能量碰撞合成。在本文中,我們也由放熱反應及熱力學的觀點,對傳播燃燒合成和高能量碰撞之關聯性作一探討。
• 英文摘要： Processing TiB/sub 2/ ceramic powders by a combination of self-propagating high-temperature synthesis(SHS) and high energy milling/mechanical alloying (MA) has been studied in this work. The milling time of the unreacted powders was noted to influence the reaction parameters of the self-propagating high-temperature synthesis. As the milling time was increased, the reactant size was decreased due to the collision between the powders and the balls. A decrease in the reactant size increased the reactivity and the combustion temperature/propagation velocity, further influencing the microstructure /properties of the synthesized products. Fine TiB/sub 2/ ceramic powders were spontaneously formed when the high energy milling time was further increased to a critical time. In addition to self- propagating high-temperature synthesis and high energy milling, other techniques using the exothermic reaction to process materials are also discussed in this article.
• 中文關鍵字： 高能量碰撞; 機械合金化; 自我傳播高溫合成; 燃燒合成; 放熱反應; 熱力學
• 英文關鍵字： High Energy Collision; Mechanical Alloying; Self-Propagating High-Temperature Synthesis (Shs); Combustion Synthesis; Exothermic Reaction; Thermodynamics