Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Microstructure of the reaction product region formed due to the interaction of aluminium with nickel oxide at 700°C

JOANNA WOJEWODA-BUDKA

nr katalogowy: 79742

Metal-ceramic Al-Al2O3 composites produced due to the in-situ reaction between liquid aluminium and oxides such as (SiO2, ZnO, CoO, mullite) are characterized by continuous and mutually interpenetrating metallic and ceramic lattices. Such processing technique is a low cost and allows to obtain the material of high strength and high elastic modulus. However, the products of the reaction should possess thermodynamic compatibility as well as similar values of the thermal expansion coefficient. One of the promising candidates among the possible oxides is NiO. Liu and Köster [1] predicted that the composite characterized by the interpenetrating networks of Al-Al2O3 will be possible to obtain as a result of the reaction between Al and NiO at 1000°C. There were unsuccessful attempts to infiltrate the polycrystalline NiO by liquid aluminium [2] in the temperature range of 900÷1200°C, which was explained by almost negligible difference in molar volume between substrate and product of the reaction. However, the volumetric mismatch between the initial oxide and Al2O3 was incorrectly calculated which was later explained by Sobczak [3], who also pointed that the experimental failure described by Loehman et al. [2] was a result of lack of the wettability in the Al/NiO system. Nevertheless, later studies of Sobczak et al. [4] reported the wettability by aluminium of NiO surface even at 700°C and the formation of a wide zone of reactively formed Al2O3 nanoparticles intermixed with Al3Ni precipitates in Al matrix. The mechanism of the formation of such fine alumina precipitates as well layered structure of the reaction product region was proposed in [5]. Unfortunately, the type of Al2O3 nanoparticles was not specified. Fahrenholtz [6] applied the mixture of powders (Al and NiO or NiAl2O4) and much higher temperature of the process (1400°C) and produced the NiAl-Al2O3 and Ni3Al-Al2O3 composites. Zhu et al. [7] produced NiAl-alumina composites [...]

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