(1. 集美大學(xué) 輪機(jī)工程學(xué)院 福建省船舶與海洋工程重點(diǎn)實(shí)驗(yàn)室，廈門 361021；
2. 大連理工大學(xué) 材料改性教育部重點(diǎn)實(shí)驗(yàn)室，大連 116024；
3. Department of Materials Science and Engineering, North Carolina State University, Raleigh 27695, USA)
摘 要: 利用介質(zhì)阻擋放電等離子體輔助球磨和普通球磨分別對(duì)Al2O3粉末進(jìn)行活化，研究等離子體輔助球磨活化Al2O3合成AlN的碳熱還原反應(yīng)機(jī)制。結(jié)果表明：等離子體輔助球磨40 h的Al2O3粉末，在N2氣氛中于1400 ℃下保溫4 h可以完成碳熱還原反應(yīng)，全部轉(zhuǎn)化為AlN。經(jīng)等離子體輔助球磨后，Al2O3的碳熱還原反應(yīng)符合氣相反應(yīng)機(jī)制，等離子體輔助球磨活化大大降低Al2O3的后續(xù)反應(yīng)溫度，輔助球磨40 h后的Al2O3合成AlN的反應(yīng)激活能下降到371.5 kJ/mol。等離子體的協(xié)同效應(yīng)促使輔助球磨中Al2O3晶體產(chǎn)生更嚴(yán)重的晶格畸變，這是激活 Al2O3并促進(jìn)碳熱還原反應(yīng)的一個(gè)重要因素。
關(guān)鍵字: Al2O3；等離子體輔助球磨；活化；碳熱還原反應(yīng)；AlN
（1. Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,
Institute of Marine Engineering, Jimei University, Xiamen 361021, China;
2. Key Laboratory of Materials Modification, Ministry of Education,
Dalian University of Technology, Dalian 116024, China;
3. Department of Materials Science and Engineering, North Carolina State University, Raleigh 27695, USA）
Abstract:The synthesis mechanism of AlN by Al2O3 powders through carbothermic reduction reaction was investigated, in which the Al2O3 powders was activated by plasma assisted ball milling (PM) or by conventional ball milling (CM). The results indicate that Al2O3 powders activated by plasma assisted ball milling for 40 h can be converted to AlN totally through carbothermic reduction reaction when annealed at 1400 ℃ for 4h in N2. It is gas reaction mechanism for the carbothermic reduction reaction of Al2O3 powders after plasma assisted ball milling. The subsequent reaction temperature of Al2O3 powders is reduced significantly because the reaction activation energy decreases to 371.5 kJ/mol after plasma assisted ball milling for 40 h. A lot of lattice distortions are generated in Al2O3 grain due to the cooperation of plasma and ball milling, which is an important factor for promoting the carbothermic reduction reaction of Al2O3 powders activated by plasma assisted ball milling.
Key words: Al2O3; plasma assisted ball milling; activation; carbothermic reduction reaction; AlN
