本文關(guān)鍵詞：高活性鋁基合金燃料的制備與熱性能研究　出處：《華中科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 合金燃料 氣霧化法 熱反應(yīng)活性 集中氧化 含能材料

【摘要】：為克服純Al燃料在應(yīng)用中遇到的問(wèn)題,如燃燒不完全、燃燒速率低和點(diǎn)火溫度高等,本論文通過(guò)將Al合金化,制備出高活性的Al基二元和三元合金燃料,使其成為有潛力應(yīng)用于軍工領(lǐng)域的含能材料。采用緊耦合氣霧化法制備了Al-3Li和Al-6Mg二元合金燃料和不同配比的Al-Mg-Zr三元合金燃料。通過(guò)XRD、SEM/EDS、TG-DTA以及激光粒度儀等手段表征分析制備的合金粉末。結(jié)果表明,合金粉末具有良好的球形度很高且表面較為光滑。對(duì)于Al-3Li和Al-6Mg二元合金燃料,它們的氧化行為顯著不同。Al-3Li合金只發(fā)生了一次劇烈的氧化反應(yīng),且該反應(yīng)基本完全,而Al-6Mg合金則進(jìn)行了多步氧化,且多步氧化反應(yīng)后依然沒(méi)有完全。通過(guò)Kissinger方程對(duì)這兩種合金粉進(jìn)行氧化動(dòng)力學(xué)分析得出,Al-3Li合金唯一的一次氧化反應(yīng)的表觀活化能Ea為339.7 kJ·mol-1,Al-6Mg合金粉的第一次和第二次氧化反應(yīng)的活化能Ea分別為183.7 kJ·mol-1和221.2kJ·mol-1。與Al-6Mg合金相比,Al-3Li合金具有更低的劇烈氧化溫度,更大的反應(yīng)速率和更加完全的反應(yīng)程度,可知Al-3Li合金的總體熱反應(yīng)活性比Al-6Mg合金高。對(duì)于緊耦合氣霧化法制備的Mg含量為5%~30%的Al-Mg-Zr合金粉,隨著Mg含量的升高,氧化反應(yīng)發(fā)生的溫度明顯降低,氧化過(guò)程由多步氧化逐漸轉(zhuǎn)變?yōu)橐徊窖趸�。其中Al-20Mg-2Zr和Al-25Mg-2Zr粉末分別在945℃和938℃呈現(xiàn)集中氧化放熱,且Al-20Mg-2Zr粉末具有最大的氧化放熱焓。通過(guò)對(duì)Al-20Mg-2Zr粉末集中氧化后的產(chǎn)物分析得出,發(fā)生在945℃的劇烈氧化反應(yīng)很完全,且該氧化反應(yīng)的活化能Ea約為250 kJ·mol-1,頻率因子A非常大,較小的活化能和很大的頻率因子決定了該粉末在高溫時(shí)的高活性和很大的氧化反應(yīng)速率。最后,Al-3Li和Al-20Mg-2Zr都具有優(yōu)異的反應(yīng)活性,使得這兩種合金燃料在軍工領(lǐng)域具有潛在的應(yīng)用前景。
[Abstract]:In order to overcome the problems encountered in the application of pure Al fuel, such as incomplete combustion, low combustion rate and high ignition temperature, Al binary and ternary alloy fuels with high activity were prepared by alloying Al. In this paper, Al-3Li and Al-6Mg binary alloy fuels and Al-Mg-Zr ternary alloy combustion with different ratios were prepared by tight coupling vaporization method, which have the potential to be used as energetic materials in the field of military industry. Through XRD. The alloy powder was characterized and analyzed by means of SEM- / EDS- TG-DTA and laser particle size analyzer. The alloy powder has good sphericity and smooth surface. For Al-3Li and Al-6Mg binary alloy fuel. The oxidation behavior of Al-3Li alloy was significantly different. The oxidation reaction of Al-3Li alloy had only one violent reaction, and the reaction was basically complete, while that of Al-6Mg alloy was multistep oxidation. The oxidation kinetics of the two alloy powders was analyzed by Kissinger equation. The apparent activation energy of the single oxidation reaction of Al-3Li alloy is 339.7 kJ 路mol-1. The activation energy of the first and second oxidation reactions of Al-6Mg alloy powder is 183.7, respectively. KJ 路mol-1 and 221.2 kJ 路mol-1. Compared with Al-6Mg alloy. Al-3Li alloy has lower oxidation temperature, higher reaction rate and more complete reaction degree. The results show that the overall thermal reaction activity of Al-3Li alloy is higher than that of Al-6Mg alloy, and the mg content of Al-Mg-Zr alloy powder prepared by tightly coupled vaporization method is 530%. With the increase of mg content, the temperature of oxidation reaction decreases obviously. The oxidation process gradually changed from multi-step oxidation to one-step oxidation, in which Al-20Mg-2Zr and Al-25Mg-2Zr powders showed concentrated oxidation exothermic at 945 鈩，

本文編號(hào)：1371264