Joining of Metallic Grains by Thermal Oxidation
The subject of this work is the mechanism of formation of intergranular oxide joints (IJ) in uncompact-ed nickel and iron powder layers oxidized in air at 400 – 800°C. Four kinds of nickel powders of different size and morphology of grains and one iron powder were investigated. The strength of IJ depends on the size of contact area formed between oxide layers of adjacent grains. It is a function of time and temperature of oxidation and the size, shape and morphology of the grains. On the interface between both contacting oxide layers is formed a grain-boundary-like zone, which is responsible for the cohesion in the IJ.
KeywordsContact Area Oxide Layer Thermal Oxidation Iron Powder Metallic Powder
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