Combustion synthesis of AlB2-Al2O3 composite powders with AlB2 nanowire structures. (18th May 2018)

• Record Type: Journal Article
• Authors: Yang, Pan; Xiao, Guoqing; Ding, Donghai; Ren, Yun; Yang, Shoulei; Lv, Lihua; Hou, Xing
• Is Part Of: Materials research express. Volume 5:Number 5(2018)
• Publication Date: 2018-05-18
• Subjects: Mg-Al alloy -- combustion synthesis -- AlB2-Al2O3 composite powders -- AlB2 nanowires; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/aac0c5
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Using of Al and B2 O3 powders as starting materials, and Mg-Al alloy as additives, AlB2 -Al2 O3 composite powders with AlB2 nanowire structures were successfully fabricated via combustion synthesis method in Ar atmosphere at a pressure of 1.5 MPa. The effect of different amount of Mg-Al alloy on the phase compositions and morphology of the combustion products was investigated. The results revealed that AlB2 and Al2 O3 increased, whereas Al decreased with the content of Mg-Al alloy increasing. The impurities MgAl2 O4 and AlB12 would exist in the sample with adding of 18 wt% Mg-Al alloy. Interestingly, FESEM/TEM/EDS results showed that AlB2 nanowires were observed in the products when the content of Mg-Al alloy is 6 wt% and 12 wt%. The more AlB2 nanowires can be found as the content of Mg-Al alloy increased. And the yield of AlB2 nanowires with the diameter of about 200 nanometers (nm) and the length up to several tens of micrometers ( μ m) in the combustion product is highest when the content of Mg-Al alloy is 12 wt%. The vapor, such as Mg-Al (g), B2 O2 (g), AlO (g) and Al2 O (g), produced during the process of combustion synthesis, reacted with each other to yield AlB2 nanowires by vapor-solid (VS) mechanism and the corresponding model was also proposed.