Based on aerated concrete block wall material, design, construction three aspects under effective control, so as to avoid the cracking of the wall and carry out.

The 8 wt.% yttria-stabilized zirconia (8YSZ) thermal barrier coatings (TBCs) are widely used to protect hot superalloy components of gas turbine and jet engine. However, Cracks and pores in the 8YSZ coating would accelerate the oxidation of the bondcoat alloy and the corrosion of 8YSZ topcoat by molten salts and finally result in permanent failure of the TBCs. Hence, in this work, a sol-gel spin-coating method was employed to prepare a dense α-Al2O3 film on the surface of air-plasma-sprayed 8YSZ coatings, in order to block the paths of cracks and pores while keeping the stress tolerance of 8YSZ coatings. The influences of the polyvinylpyrrolidone (PVP) and alumina content of the sol on the microstructure of the α-Al2O3 film were investigated. It is found that a sol with PVP addition amount of 50 mg/mL and alumina solid content of 10% let to the achievement of a compact α-Al2O3 film. The positive results in this work would inspire more efforts to prepare dense films on TBCs and therefore improve their performance under service conditions.

Doped ceria has been reported as a promising candidate of electrolyte applicable for solid oxide fuel cells (SOFCs) and oxygen sensors due to its high ionic conductivity at intermediate temperature. However, it suffers from certain limitations including the existence of electronic conductivity at reduced atmosphere, which would thus increase the leakage current in cells, and the low fracture strength. In this work, we fabricated a bilayer electrolyte with samarium and neodymium co-doped ceria (SNDC) and yttrium stabilized zirconia (YSZ) using spark plasma sintering (SPS) method, which possess the advantages of two layers, high conductivity of SNDC and good electron blocking ability of YSZ. Both layers of the specimen we obtained were dense and well crystallized according to the scanning electron microscope (SEM) and X-ray diffraction (XRD). The bilayer electrolyte exhibits improved ionic conductivity than YSZ with the value of 1.7 S/cm at 550.

Air-plasma-sprayed (APS) thermal barrier coatings (TBCs) were oxidized in air at different temperatures for 1000h and sequentially investigated by impedance spectroscopy (IS) and scanning electron microscopy (SEM). After oxidation at temperatures higher than 900°C, a thermally grown oxide (TGO) layer was formed at the bond coat/topcoat interface in TBCs. The impedance spectra of oxidized TBCs typically contains two relaxation processes that stem from the yttria-stabilized zirconia (YSZ) topcoat of TBCs and the TGO layer. The TGO resistivity that obtained by simulating the impedance spectra increased with the increasing of annealing temperature, demonstrating the growth and the densification of TGO layer.