5 results about "Metallic conductivity" patented technology

The invention discloses an alkaline earth metal stable oxygen-like superatomic cluster material and a preparation method thereof.The material is prepared from aluminum powder, alkaline earth metal hydride and anhydrous metal halide serving as a structure-directing agent, and the preparation method comprises the steps that firstly, under the inert atmosphere, the raw materials are subjected to high-energy ball milling to prepare a composite precursor; then temperature programming heat treatment is carried out, hydrogen generated by hydride in-situ decomposition is used for reducing an interface and inducing lattice defects, and meanwhile, interface migration and chemical adsorption effects of halide ions are used for pinning newly generated cluster units; and finally, carrying out non-equilibrium densification through spark plasma sintering. According to the method, the defect that a thermodynamically stable alloy phase is easily formed in a traditional smelting method is overcome, the oxygen-like cluster structure with the 38 electron open shell layer characteristic is successfully stabilized in a macroscopic solid state through a synergistic mechanism of gas phase pore forming and interface pinning, and the material is endowed with excellent catalytic activity and semimetal conduction characteristic.

The invention relates to the technical field of nondestructive testing, in particular to a method and a system for detecting corrosion of a metal component in a soil medium based on pulsed eddy current, which are characterized in that background eddy current loss parameters of soil are quantitatively calculated by establishing an eddy current field distribution model in the soil medium; then, physical mapping characteristics such as derivative zero-crossing time and eddy current loss characteristic values are extracted from a detection coil signal on the basis, and a quantitative mapping relation between the physical mapping characteristics and the metal conductivity is established; and finally, fusing the physical characteristics and waveform transformation characteristics extracted from the signals, and inverting through a neural network model to obtain geometric parameters such as depth, length and the like of the corrosion defect. According to the method, soil interference is quantified through modeling, and targeted compensation and fusion are performed on the soil interference in feature extraction and inversion, so that the defects that a traditional pulsed eddy current technology is low in signal-to-noise ratio and cannot perform quantitative evaluation in a soil medium are fundamentally overcome, and rapid, non-excavation and high-precision quantitative detection on the corrosion state of the buried metal component is realized.

The invention belongs to the technical field of metal characteristic measurement, and provides a metal conductivity measuring device and method for a torsion balance, and the device comprises a magnetic field generation device, a torsion balance structure, an angle deflection detection device and a terminal, and the magnetic field generation device comprises two uniform magnetic field coils and two gradient magnetic field coils which are horizontally arranged. The torsion balance structure comprises an insulated balance rod, a torsion wire and a supporting frame, one end of the torsion wire is fixedly connected with the supporting frame, the other end of the torsion wire is rotationally connected with the center position of the balance rod, one end of the balance rod is connected with the balancing block, the other end of the balance rod is connected with a sample, and the sample is located between the two uniform magnetic field coils and the two gradient magnetic field coils. The angle deflection detection device is located in the center of the balance rod. The terminal is in communication connection with the angle deflection detection device. The method has no requirement on the surface property of the metal sample, and the conductivity of the sample can be calculated only through the rotation angle of the balance rod.

The application discloses a titanium-doped silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S100, mixing a carbon source, a titanium source and a pore-forming agent in water to obtain a first product containing titanium oxide through freeze-drying; S200, calcining the first product in a reducing gas to obtain Ti4O7-doped porous carbon; and S300, performing gas-phase deposition of a silane gas source and a carbon gas source on the outer surface and pores of the Ti4O7-doped porous carbon in an inert gas to obtain a silicon-carbon negative electrode material. The carbon source, the titanium source and the pore-forming agent are mixed in water to generate titanium oxide, and the titanium oxide is calcined by using a reducing gas, so that the titanium oxide is reduced into Ti4O7 with metallic conductivity and high catalytic activity, and the electron transmission is fast and the structure is stable. The silane gas source and the carbon gas source are gas-phase deposited on the Ti4O7-doped porous carbon to generate silicon-carbon active substances in situ, and the structural stability and the conductivity are improved.

This invention discloses a method for determining the pollution level of an insulator containing metallic components, comprising: obtaining the sampling area A of a polluted insulator sample, the total mass of insoluble matter in the polluted insulator sample, and the mass fraction of various metallic elements in the insoluble matter; calculating the metallic pollution surface density based on the sampling area A of the polluted insulator sample, the insoluble matter in the polluted insulator sample, and the mass fraction of various metallic elements in the insoluble matter; determining the metallic conductivity contribution conversion factor and the metallic physical contribution correction factor based on the metallic pollution surface density and metallic components; obtaining the traditional equivalent salt density and the traditional equivalent ash density of the polluted insulator sample; correcting the traditional equivalent salt density using the metallic conductivity contribution conversion factor and correcting the traditional equivalent ash density using the metallic physical contribution correction factor, and calculating the equivalent equivalent salt density and the equivalent equivalent ash density respectively; and evaluating the pollution level of the insulator based on the equivalent equivalent salt density and the equivalent equivalent ash density.