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High-porosity powder materials and products (including those made of aluminum and nickel modified with shallow alumina microspheres, etc.)

Высокопористые порошковые материалы и изделия, в том числе из алюминия, никеля, модифицированного добавками алюминия, полых оксидных микросфер и др.
When nickel powder is used to manufacture capillary-porous heat pipes, high requirements are imposed upon its porosity (50%), pore size (1–2 µm), and permeability coefficient (1×10-14 m2). Attainment of the desired properties was carried out using two strategies: combination of powders of different morphology (electrolytic and carbonyl nickel) and addition of aluminum as a modifying agent. The technology for producing porous feedstock with total porosity of 50–60%, pore size of 1–1.5 µm, and the permeability coefficient of (2-3)×10-14 m2 has been elaborated. A more challenging task was to manufacture products with biporous structure. An additive of silicon and aluminum powder (3–10 wt %) was used. The formation of Ni-Al and Ni-Si intermetallides during sintering ensures the micropore formation both due to the Kirkendall effect and due to the decrease in volume of the solid phase, which is caused by the difference in densities of the initial charge mixture and the intermetallide being formed. The porosity and size have been successfully controlled by varying the dispersity of the initial powders and selecting the conditions of the reaction of intermetallide formation so that it occurred in the solid-phase diffusion region. The porosity of the sintered feedstock was 50–55%; the maximum pore size was 1.5 µm; the permeability coefficient was (2-3)×10-14 m2 Production of porous feedstock using Al powder is impeded by low strength of porous products, which can be attributed to the existence of an oxide film on the surface of powder particles. KAlF4 flux and silumin (11.5% Si) additives were used when elaborating the method for producing porous aluminum. Strong porous feedstock with porosity up to 45% and bending strength up to 80 MPa were obtained by varying flux and aluminum particle size, the ratio between the components, and the sintering mode. The physical and chemical basis for producing high-porosity honeycomb-like nanomaterials operating in a wide range of temperatures and current loads for electrodes in high-energy chemical current sources (CCS) has been elaborated. The method for producing multifunctional high-porosity material based on shallow alumina microspheres (which is used as a light filling agent for polymeric composite materials for different applications, lacquers and paints; for producing sound and heat insulation materials, abrasive materials, light-weight materials for aircraft and automobile industries, etc.) has been proposed. Since the strength of alumina microspheres is insufficient for any type of molding involving application of pressure, their consolidation was achieved by sintering with a binder.

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Ph.D., Associate Professor of the Department of Powder Metallurgy and Functional Coatings
Ph.D., Professor of the Department of Powder Metallurgy and Functional Coatings
Ph.D., Associate Professor of the Department of Powder Metallurgy and Functional Coatings

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