等离子体辅助球磨活化对Al_2O_3+C合成AlN固-固反应的影响机制  

Mechanism for the effect on synthesis of AlN from Al_2O_3+C activated by plasma assisted ball milling during solid-state reaction

作　　者：戴乐阳[1,2] 郭学平[1,2] 闫锦[1,2] 张宝剑[1] 刘志杰[3] 王文春[3] 

机构地区：[1]集美大学轮机工程学院、福建省船舶与海洋工程重点实验室,福建厦门361021 [2]船机检测与再制造福建省高校工程研究中心,福建厦门361021 [3]大连理工大学材料改性教育部重点实验室,辽宁大连116024

出　　处：《功能材料》2016年第3期109-114,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51177008);交通运输部应用基础研究资助项目(2015329815220);福建省自然科学基金资助项目(2013J01202);福建省科技计划资助项目(2016H6017);福建省科技创新平台建设资助项目(2014H2001);厦门南方海洋研究中心资助项目(14GZB66NF30)

摘　　要：利用介质阻挡放电等离子体辅助球磨和普通球磨分别对Al_2O_3+C混合物料进行活化,研究等离子体辅助球磨活化后Al_2O_3+C合成AlN的碳热还原反应机制。结果表明,等离子体辅助球磨30h的Al_2O_3+C,在N2气氛中1 400℃下保温4h,Al_2O_3即可全部转化为AlN,Al_2O_3+C的碳热还原反应符合固-固反应机制。相对于球磨活化单一的Al_2O_3粉末,等离子体辅助球磨Al_2O_3+C混合粉末可以缩短10h的球磨活化时间,这主要是由于在等离子体与球磨的协同作用下,有利于Al_2O_3与C形成适于固-固反应的均匀互溶的精细复合结构,使得反应扩散通道增加,平均扩散路径缩短,这在动力学方面大大促进了Al_2O_3+C的碳热还原反应,并促使反应按照固-固机制进行。Synthesis mechanism of AlN by Al_2O_3+C powders through carbothermic reduction reaction was investigated,in which the Al_2O_3+C powders was activated by plasma assisted ball milling(PM)or by conventional ball milling(CM).The results indicate that Al_2O_3+C powders activated by 30 hof plasma assisted ball milling can be converted to AlN totally through carbothermic reduction reaction when annealed at 1 400 ℃for4hin N2.It is solid state reaction mechanism for the carbothermic reduction reaction of Al_2O_3+C powders after plasma assisted ball milling.Compared to Al2O3 powders,the time for activation of Al_2O_3+C powders by plasma assisted ball milling is reduced 10 h mainly because a homogeneous miscible mixture was formed between Al_2O_3 and C phases.As a result of the cooperation of plasma and ball milling,the subsequent carbothermic reduction reaction of Al_2O_3+C in solid state is promoted kinetically due to the homogeneous composite structures which increase the reaction diffusion channels and shorten the average diffusion length significantly.

关 键 词：Al2O3+C 等离子体辅助球磨 复合结构 固G固反应 ALN 

分 类 号：TG174[金属学及工艺—金属表面处理]