燃烧合成C/MgAl_(2)O_(4)复合粉及其显微结构演变  

Combustion synthesis of C/MgAl_(2)O_(4) composite powders and their microstructure evolution

作　　者：吕李华 丁冬海[2] 肖国庆 Lyu Lihua;Ding Donghai;Xiao Guoqing(Department of Civil and Construction Engineering,Shanxi Institute of Technology,Yangquan 045000,Shanxi,China)

机构地区：[1]山西工程技术学院土木与建筑工程系,山西阳泉045000 [2]西安建筑科技大学材料科学与工程学院,陕西西安710043

出　　处：《耐火材料》2021年第5期405-409,共5页Refractories

基　　金：国家自然科学基金项目(51772236);陕西省重点研发计划项目(2018ZDXM-GY-128)。

摘　　要：为解决纳米碳在应用过程中难分散、易氧化、成本高等问题,以草酸镁(MgC_(2)O_(4))、过氧化镁、Al_(2)O_(3)粉和Al粉为原料,燃烧合成碳/镁铝尖晶石(C/MgAl_(2)O_(4))复合粉。结果表明,当MgC 2O 4的最大掺量是33.34%(w)时,C/MgAl_(2)O_(4)复合粉中碳含量为1.17%(w),碳夹杂于尖晶石晶粒间。复合粉中镁铝尖晶石具有粒状及棒状两种形貌。粒状镁铝尖晶石由MgO与Al_(2)O_(3)相互扩散形成,棒状镁铝尖晶石由Mg蒸气与原料Al_(2)O_(3)以气-固生长机制主导形成。This work aims at solving the problems of difficult dispersion,easy oxidation and high cost of nano carbon during application.C/MgAl_(2)O_(4) composite powders were synthesized using MgC_(2)O_(4),MgO 2,Al_(2)O_(3)powder,and Al powder as raw materials by combustion synthesis.The results indicate that the with the maximum MgC_(2)O_(4) addition of 33.34 mass%the prepared powder contains 1.17 mass%of carbon and carbon distributes among spinel grains.The MgAl_(2)O_(4) spinel shows both granular and rod-like morphologies.The granular MgAl_(2)O_(4) is generated from the mutual diffusion between MgO and Al_(2)O_(3);while the rod-like MgAl_(2)O_(4) spinel is mainly formed by the vapor-solid growth mechanism from Mg vapor and Al_(2)O_(3).

关 键 词：C/MgAl_(2)O_(4)复合粉 燃烧合成法 燃烧波淬熄技术 显微结构演变 

分 类 号：TQ175[化学工程—硅酸盐工业]