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• W2724364668 endingPage "266" @default.
• W2724364668 startingPage "258" @default.
• W2724364668 abstract "Surface oxidation of metal powders is a common challenge in powder metallurgy processing, and the oxides must eventually be broken up to produce high-quality, structural components. Here it is proposed that surface oxidation may be beneficial in the creation of porous metals through intraparticle expansion, which creates porosity by the reduction of oxides which are distributed within a metallic matrix. Previous work utilized the addition of separate oxides to the metal as a two-component (Cu powder + CuO powder) cryogenic ball milling process. The feasibility of controlling pore formation by directly oxidizing copper powder before milling is examined, and it is then extended to room temperature processing. Both pore distribution and morphology vary greatly with oxygen content, which can be controlled during processing. The pore volume and interconnectedness are maximized at intermediate oxygen concentration, indicating competing effects of the oxide loading. When room temperature high-energy ball milling is applied, the oxidized powder was found to exhibit even greater expansion upon annealing and larger pore size, though cold welding of the copper was encountered at short milling times. Using a single-component method at room temperature may prove valuable to reduce the cost and complexity of large scale production of expandable powder feedstock, and key considerations are discussed." @default.
• W2724364668 created "2017-07-14" @default.
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• W2724364668 date "2017-11-01" @default.
• W2724364668 modified "2023-09-30" @default.
• W2724364668 title "Advancing commercial feasibility of intraparticle expansion for solid state metal foams by the surface oxidation and room temperature ball milling of copper" @default.
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• W2724364668 doi "https://doi.org/10.1016/j.jallcom.2017.07.029" @default.
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