• Simple guide of metal foam
    Simple guide of metal foam

    Metal foam, that is, the interior of the metal, is dispersed with a large number of directional or random pores having a diameter of about 2 um to 3 mm. Due to the different design requirements for the holes, the holes may be foam type, braided type, honeycomb type and the like. Metal foam can also be classified into two types of independent pore type and continuous pore type according to the shape of the pores. The independent material has the characteristics of small specific gravity, good rigidity, good specific strength, good vibration absorption and sound absorption performance; in addition to the above characteristics, the continuous material has the characteristics of permeability and good ventilation. Because metal foam have the characteristics of structural materials and functional materials, they are widely used in aerospace, transportation, construction, mechanical engineering, electrochemical engineering, environmental protection engineering and other fields. Types of metal foam: Nickel Foam, Copper Foam, Open Cell Aluminum Foam, Titanium Foam, Silver Foam, Stainless Steel Foam, Graphene Foam, Carbon Foam The metal foaml is a multi-purpose engineering material with excellent performance, which is jointly supported by the six ministries and commissions of the Ministry of Science and Technology and the Ministry of Commerce and the key areas of high-tech national support clearly defined below. It also has the dual functions of functional materials and structural materials. It has various functions such as damping, shock absorption, noise reduction, flame retardant, filtration, gas distribution, electromagnetic shielding, etc., and has certain mechanical strength, as well as light weight, heat resistance, corrosion resistance, large specific surface area, and chemical The advantages of high electrochemical activity and no aging make it work normally under high temperature and harsh environment conditions, which helps solve many application problems. Can be widely used in aerospace, automotive, construction, chemical, metallurgy, medicine, electrochemical industry and military industry, specific application areas: exhaust gas filtration; diesel particulate trap; sound absorption and noise reduction; Insulation and heat-dissipating materials; air filtration, filters; vacuum filtration, open-type automotive filters; smoke suppression in chemical workshops; oil tank baffles; smoking fog, water, oil; air duct air baffles; sewer water flow baffles; Hull ventilation; pipeline filtration and disinfection; water desalination evaporator baffle; motor muffler; energy reducer; catalytic converter; indoor switchboard; light quality and high strength board; Structure; jet engine mute; toothed heat exchanger; liquid heat exchanger; cooling tower capacitor; battery plate, porous spark plug, etc.

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  • Metal Foam Standard
    Metal Foam Standard

    There are 12 standards for metal foam in this topic. In the international standard classification, metal foam relates to building materials, building protection, surface treatment and plating, non-ferrous metals, lubricants, industrial oils and related products, building components,  building structures and Laboratory Electrode, etc In the Chinese standard classification, metal foam involves insulation, sound absorption, lightweight and fireproof materials, material protection, powder metallurgy synthesis, basic standards and general methods. Industry Standards - Building Materials, Standards for Metal foams JC/T 1051-2018 Metal surface hard aldehyde foam composite board JC/T 2155-2012 Metallic phenolic foam sandwich panel for construction German Standards Institute, standard for metal foam Coupling materials -- Test methods -- Part 20: Foam bonding Testing of metal working fluids - Tests in VSI foam analyzers - Part 1: General working principle British Standards Institute, Standard for Metal foams Corrugated metal in coils - Test methods - Foam bonding Corrugated coatings of rolled coils - Test methods - Foam bonding French Standards Association, standard for metal foam Coiled coated metal - Test methods - Part 20: Foam bonding European Committee for Standardization, standards for metal foam Coupling materials -- Test methods -- Part 20: Foam bondability Korean Standard, Standard for Metal foams KS D 0080-2010 Metal foam. Terminology (US) Ford Motor Standard, Standard for Metal foams FORD ESB-M4D257-A-2009 Polyvinyl Chloride-Polyurethane Foam-Metal Laminate*** Used with Standard FORD WSS-M99P1111-A*** FORD ESB-M4D257-A-2005 Polyvinyl Chloride-Polyurethane Foam-Metal Laminate*** Used with Standard FORD WSS-M99P1111-A*** , standards for metal foam GOST 23486-1979 Three-layer metal wall panel with foamed polyurethane as insulation material. Technical conditions

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  • Is metal foams flexible?
    Is metal foams flexible?

    The mechanical properties of metal foam strongly depend on the internal structure. When the feature size of the member is on the same order of magnitude as the cell feature size, it exhibits a significant scale effect. In order to reveal the mechanical mechanism of this scale effect, the shear and pure bending tests of metal foams  specimens were studied. On the one hand, the analytical solution is given by the theory of strain gradient elasticity, which contains the key model parameters of the size in the materials. On the other hand, each segment of the cell wall is considered to be a Tiemu Xinke beam, thereby establishing a beam-chain network as a micromechanical model of the metal foam. The relationship between the strain gradient continuum and the elastic parameters of the matrix metal material is established by the strain energy equivalent principle. It was found that the boundary layer constraints have an important influence on the mechanical response of the metal foam. In the bending problem, the strain gradient theory solution can be consistent with the numerical solution of the chain net model only after applying appropriate additional corner constraints to the upper and lower surfaces of the discrete model. This provides an intuitive example of understanding the unconventional boundary conditions in strain gradient theory. Through the data fitting, the relationship between the intrinsic size and the cell feature size is obtained, which is consistent with the literature conclusion.

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  • Is the strength of metal foam lower than the same dense metal?
    Is the strength of metal foam lower than the same dense metal?

    The metal foam has a porosity of more than 90-95%. The holes are also divided into open cell and close cell. The metal foam made with the hole is very soft, soundproof, heat conductive, and the energy absorption effect is very good. The metal foam rigidity of the close hole is increased, but its rigidity and toughness are positively correlated with the structure type and density of the pores, and no corresponding experiment can be found to determine its strength. There are related papers on material science, you can find the properties of metal foam made of Al, Cu and Ni are different.

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  • Porosity of metal foam
    Porosity of metal foam

    Porosity refers to the ratio of the volume of all pores in a porous body to the total volume of the porous body, and often measures the size of the void space of the porous body. The metal foam often has a porosity of more than 90-95% and a porous metal having a certain strength and rigidity. These metals have high porosity and pore diameters up to the millimeter scale.

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