Premium
Alumina/Aluminum Composites Formed by the Directed Oxidation of Aluminum Using Magnesia as a Surface Dopant
Author(s) -
Xiao Ping,
Derby Brian
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb07048.x
Subject(s) - microstructure , dopant , scanning electron microscope , microanalysis , materials science , magnesium , gravimetric analysis , aluminium , thermogravimetric analysis , particle size , particle (ecology) , kinetics , metallurgy , chemical engineering , sintering , doping , mineralogy , composite material , chemistry , organic chemistry , oceanography , physics , optoelectronics , quantum mechanics , engineering , geology
Al 2 O 3 /AI composites have been formed by the directed oxidation of pure Al doped with MgO powder. Thermal gravimetric analysis was used to characterize reaction kinetics. Optical and scanning electron microscopy and SEM coupled with microanalysis were used to characterize the microstructure of product. Directed oxidation is initiated without an incubation period. The particle size of the MgO powder determines the initial microstructure. Mg is retained in some form at the growth surface after the disappearance of the original MgO; however, there is a continuous loss of Mg from the system. The presence and distribution of the Mg compounds play a key role in the directed oxidation.