Influence of Magnesium‐Aluminum Spinel on the Directed Oxidation of Molten Aluminum Alloys

Abstract

The directed oxidation of some molten aluminum alloys was studied. Alloys containing Si, Zn, and Mg are readily converted into A1,03/AI composites with the characteristic directed metal oxidation process (DIMOX) metal-channel structure. No reaction took place when alloys without Mg were used. However, when Mg-free melts containing Si and Zn were in contact with bulk spinel (MgAlZO4), the typical reaction product grew from the metal pool, although without formation of the spinel starter layer which was thought to he a prerequisite for DIMOX growth. Furthermore, the growth front was more planar than when Mg-containing alloys were used. [

Formation of Al2O3/Al Composites by Directed Melt Oxidation of Al-Si-Zn Alloy

“…In contrast to some previous results (Ref 11,17), metallic Zn was found to be capable of initiating directed melt oxidation in all cases. In this study, however, the ability of Zn content (£3 wt.%) in Al alloy was found to be different in promoting the oxidation reaction.…”

Synthesis and characterization of nanocrystalline MgAl2O4 spinel via modified sol–gel method

“…Magnesium aluminate spinel (MgAl 2 O 4 ) is one of the most famous ceramic material type of metal-oxide with special properties such as high melting point (2135°C), good thermal shock resistance, high mechanical strength, low thermal expansion coefficient, excellent resistance to acid and bases, and also having catalytic and optical properties [1][2][3][4][5][6]. Due to these desirable properties, it found widely application in metallurgical, electrochemical, radiotechnical and chemical industries [7] Thus, the preparation of magnesium aluminate powders with high purity, chemical homogeneity, control of stoichiometry, fine particle size, narrow particle size distribution, and minimum particle agglomeration with high sinter activity has received considerable attention in order to improve the material properties [8].…”

CuFe2−xLuxO4 nanoparticles: synthesis through a green approach and its photocatalyst application

“…Some spinel-type oxides such as BaCr 2 O 4 [14], NiFe 2 O 4 [15], CaBi 2 O 4 [16], ZnGa 2 O 4 [17], CuFe 2 O 4 [18], ZnFe 2 O 4 [19] and CuAl 2 O 4 [20][21][22] used as photocatalysts are semiconductor materials with narrow band high and these materials have been proven to be an efficient in the degradation of pollutants and/or the production of photocatalytic hydrogen. Many methods for preparation of nanosized spinals have been reported such as co-precipitation, sol-gel, sonochemical, microemulsion and solution combustion [23][24][25][26]. Thus, the preparation of CuFe 2-x Lu x O 4 powders with high purity, chemical homogeneity, control of stoichiometry, fine particle size, narrow particle size distribution, and minimum particle agglomeration with high sinter activity has received considerable attention in order to improve the material properties [27].…”