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Casting routes for porous metals production

Lichý P., Bednarova V., Elbel T.

Archives of Foundry Engineering

2012

Vol. 12, iss. 1

71-74

The last decade has seen growing interest in professional public about applications of porous metallic materials. Porous metals represent a new type of materials with low densities, large specific surface, and novel physical and mechanical properties, characterized by low density and large specific surface. They are very suitable for specific applications due to good combination of physical and mechanical properties such as high specific strength and high energy absorption capability. Since the discovery of metal foams have been developed many methods and techniques of production in liquid, solid and gas phases. Condition for the use of metal foams - advanced materials with unique usability features, are inexpensive ways to manage their production. Mastering of production of metallic foams with defined structure and properties using gravity casting into sand or metallic foundry moulds will contribute to an expansion of the assortment produced in foundries by completely new type of material, which has unique service properties thanks to its structure, and which fulfils the current demanding ecological requirements. The aim of research conducted at the department of metallurgy and foundry of VSB-Technical University Ostrava is to verify the possibilities of production of metallic foams by conventional foundry processes, to study the process conditions and physical and mechanical properties of metal foam produced. Two procedures are used to create porous metal structures: Infiltration of liquid metal into the mold cavity filled with precursors or preforms and two stage investment casting.

Bezpośrednie oznaczanie węgla błyszczącego w masach formierskich

Jelinek P., Miksowsky F., Bednarova V., Dubrawski S., Sawicki J., Wiechowski J., Więch M.

Prace Przemysłowego Instytutu Elektroniki

2001

nr 145

30-42

Artykuł omawia nową metodę oznaczania węgla błyszczącego w masach formierskich, która bazuje na obróbce badanej próbki w wysokiej temperaturze przy wymuszonym przepływie azotu, tlenu lub ich mieszaniny. Węgiel błyszczący osadzany jest na wacie kwarcowej i następnie spalany w tlenie. Zawartość CO2 w produktach spalania mierzona jest sondą NDIR. Wyniki pomiaru obrabiane są przez system komputerowy, drukowane w formie raportu i archiwizowane. W artykule porównano nową metodę z powszechnie stosowanyą metodą retortową i metodą IFG Dusseldorf.

The paper describes the new method of determination of content of bright coal in foundry sands based on high temperature processing of the sample by forced flow of nitrogen, oxygen or mixture of them. During process the bright coal is deposited on quartz wool an next burned in oxygen. The content of CO2 in combustion products is measured by NDIR probe. The measurements results are processed by computer system, printed in form of report and stored. In the paper the new method is compared with common used retort method and IFG Dusseldorf method.