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Magnetic alloy/dielectric oxide composite nanofiber and preparation method thereof, and wave-absorbing coating prepared by adopting nanofiber

The invention discloses a magnetic alloy / dielectric oxide composite nanofiber and a preparation method thereof, and a wave-absorbing coating prepared by adopting the nanofiber. The magnetic alloy / dielectric oxide composite nanofiber comprises magnetic alloy and dielectric oxide, wherein the magnetic alloy and the dielectric oxide particles are distributed in the axial direction of the nanofiber. The preparation method comprises the steps: mixing the magnetic alloy and dielectric oxide metal salt uniformly and dissolving the mixture in a solvent to prepare a spinning solution; and adopting an electrostatic spinning technology to prepare a PVP / metal salt precursor fiber from the spinning solution, drying, roasting and reducing to prepare the composite nanofiber. The thickness of the wave-absorbing coating prepared by adopting the composite nanofiber is 1 to 3 mm. The magnetic alloy / dielectric oxide composite nanofiber and the preparation method thereof, and the wave-absorbing coating prepared by adopting the nanofiber have the advantages that the composite fiber is thin, wide in frequency band and high in absorptivity, and can strongly absorb almost the whole frequency band of 2 to 18 GHz; and the electromagnetic parameters and the microwave absorbing characteristic of the fiber can be regulated and controlled conveniently in a wide range by changing the proportion of a ferromagnetic phase and a dielectric phase and the chemical constitution.
Owner:JIANGSU UNIV OF SCI & TECH

Multi-disk pouring pile one-step molding device and construction method thereof

The invention relates to a pressure grouting and vibrator built-in multi-disk pouring pile one-step molding device and a construction method thereof, belonging to the technical fields of piling machinery and construction of building industry. In the device, by adopting pressure grouting structure and built-in vibrator structure characteristics, a plurality of disk pouring piles are molded in one step by high-pressure guniting and vibrating pile pulling for synchronously constructing concrete vibration tamping extruded expansion through eight procedures of forming pores, expanding the disks several times, carrying out automatic pressure guniting on the peripheral side of a pile body in the pressing process or changing soft soil into higher-strength cement soil character by cement nano slurry, placing a reinforcement cage, pouring cement, carrying out automatic pressure guniting on the peripheral side of the pile body again in the lifting process, vibrating and pulling the pile by the built-in vibrator for synchronously constructing concrete controllable vibration tamping and molding the pile. The invention has simple main body structure, safe and reliable construction operation, simple and convenient construction procedure, high frictional resistance of the soft soil, high bearing capacity of the pile and environmental-friendly construction site.
Owner:QINGDAO JINGLI ENG
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