The implementation of a structural material into the hot section turbine engine requires protection against oxidation and water vapour. Since Mo-Si-based alloys do not provide this on their own over long period exposure time, necessity for protective coatings becomes inevitable. Rare earth silicates, especially Yb-silicates, are known great potential to protect silica vapour recession also beha...

The problem of minimizing the maximum temperature of a structure insulated by a functionally graded metal foam insulation under transient heat conduction is studied. First, the performance of insulation designed for steady-state conditions is compared with uniform solidity insulation. It is found that the optimum steady-state insulation performs poorly under transient conditions. Then, the maxi...

Recently, to further improve the performance of aluminum foam, functionally graded (FG) aluminum foams, whose pore structure varies with their position, have been developed. In this study, three types of FG aluminum foam of aluminum alloy die casting ADC12 with combinations of two different amounts of added blowing agent titanium(II) hydride (TiH₂) powder were fabricated by a friction stir weld...

The method of Fourier analysis is combined with the Galerkin method for solving the two-dimensional elasticity equations for a sandwich thermal protection system (TPS) insulation panel with foam core subjected to transverse loads. The variation of the Young s modulus through the thickness is given by a polynomial in the thickness coordinate and the Poisson s ratio is assumed to be constant. The...

The brass tubes with foam cores of AlSi7SiC3, AlSi7SiC3Fe1 and AlSi7SiC3Fe3 were produced as the crush-boxes with circle and square cross-section. Then axial compressive behavior and energy absorption capability of the foam-filled tubes were investigated during the quasi-static progressive plastic buckling. The uniaxial compressive stress–strain curves of the foam-filled brass tubes exhibited t...

Foam injection is widely applied in amounts of fields to drilling, production, and formation protection. Sometimes, the application result is disappointing, which is caused by the failure of bubble generation in foam flooding. Therefore, it is necessary to seek ways for improving the performance of foam injection. An increased disturbance to the stratum, like the vibration caused by a seismic o...

The impedance mismatch technique has been used for shock pressure amplification in two and three layer thin planar foil targets. Numerical simulation results using one dimensional radiation hydrocode MULTI in two layer targets consisting of Al-Au & Al-Cu and three layer target consisting of Plastic Al -Au & Foam-Al-Au respectively are presented. These results show a pressure enhancement up to 2...

Reasonable design of a kind non-noble metal catalyst with high catalytic performance, good stability and low cost is great significance to realize the overall water splitting. Herein, bottom-up method proposed synthesize NiFe layered double hydroxides (NiFe LDHs) coated sulfide/phosphide heterostructure on nickel foam (Ni3S2-NixPy/NF@NiFe LDH) through hydrothermal combined electrodeposition. Lo...