8results about How to "High curie temperature" patented technology

The application relates to a nickel-zinc-copper ferrite and a preparation method and application thereof, the nickel-zinc-copper ferrite comprising main components and auxiliary components; the main components comprise Fe2O3 64-66.7 mol%, NiO 9-12 mol%, ZnO 13.5-19 mol% and CuO 3-9.5 mol% with the total mole percentage being 100 mol%; the auxiliary components comprise Bi2O3 0.3-1.5 wt%, Co2O3 0.1-0.6 wt%, CaCO3 0.03-0.08 wt% and ZrO2 less than or equal to 0.1 wt% with the total mass percentage of the main components being taken as a standard. The content of Fe2O3, ZnO, NiO and CuO is controlled, the content of the auxiliary components is matched and adjusted, the prepared nickel-zinc-copper ferrite has high saturation magnetic induction intensity, high magnetic permeability, high Curie temperature, low residual magnetic induction intensity and low specific temperature coefficient, and can be better applied to power inductance or common-mode inductance.

This invention relates to the field of piezoelectric ceramics technology, and in particular to a composite ion-modified bismuth layered bismuth titanate calcium-based high-temperature piezoelectric ceramic and its preparation method. The general formula for high-temperature piezoelectric ceramics is: Ca 1‑x (LiCe) x / 2 Bi 3.75 Nd 0.25 Ti 3.935 Sc 0.065 O 15 , where x is a complex high-valence ion (LiCe). 4+ Twice the molar amount, x = 0.02, 0.05, 0.08, 0.10. This invention employs the above-mentioned composite ion-modified bismuth layered bismuth titanate calcium-based high-temperature piezoelectric ceramic and its preparation method to meet the application requirements in high-temperature environments while ensuring the material's environmental friendliness.

This invention discloses a cobalt-based Hassler alloy material, its preparation method, and its application. The preparation method includes the following steps: (1) Weighing cobalt powder, iron powder, and germanium powder in a molar ratio of 2:(1~1.75):(0.25~1), mixing them, placing them in a tungsten carbide grinding jar, adding anhydrous ethanol, adding grinding balls, and ball milling; (2) Drying and sieving the ball-milled powder, taking the sieved magnetic alloy powder, sealing it in a vacuum quartz tube, heat-treating it using a muffle furnace, and cooling it to room temperature with the furnace to obtain a cobalt-iron-germanium Hassler alloy. This invention uses a ball milling method, which can effectively change the surface morphology of the alloy powder, making it form a flake powder with a larger specific surface area, thereby improving the electromagnetic absorption performance of the magnetic alloy; by selecting and changing the proportion of the Hassler alloy components, the saturation magnetization of the magnetic alloy can be effectively increased, its Curie temperature can be increased, and the electromagnetic wave absorption performance of the magnetic alloy at high temperatures can be improved.

This utility model discloses a detachable multifunctional physiotherapy device, comprising: a shell, a scraping component, an oil-absorbing component, a moxibustion component, a heating component, a fan component, and a power module; wherein, the shell is T-shaped and divided into a front cover and a rear cover; the scraping component has several evaporation holes at its head end and is connected to the front cover; the front end of the oil-absorbing component is connected to the rear end of the scraping component; the rear end of the moxibustion component is connected to the front end of the scraping component; the heating component is disposed inside the shell; the fan component is disposed inside the rear cover; a shaving cover is disposed between the heating component and the fan component; and the power module is disposed inside the shell. This utility model, through its T-shaped shell design, effectively solves the problem of inconvenience in back physiotherapy, improving the comfort and effectiveness of the therapy; the detachable connection of each component makes the replacement of parts such as the fat-absorbing cotton and moxa sticks easy and convenient, reducing equipment maintenance costs; it greatly facilitates equipment cleaning and extends the service life of the equipment.

The invention discloses a doping preparation method of a high-temperature stable rare earth magnet assembly, and relates to a magnetic material and a preparation technology thereof. Heavy rare earth elements such as terbium and dysprosium are compositely doped into a neodymium iron boron matrix, and technological parameters such as ball milling, compression molding, sintering and magnetic field oriented annealing are optimized, so that the coercive force and magnetic energy product stability of the magnet under a high-temperature working condition are remarkably improved. The method gives consideration to magnetic performance and cost control, is suitable for high-temperature application scenes such as a welding tool magnetic attraction device, effectively solves the problem that the magnetic performance attenuation of a conventional NdFeB magnet at high temperature is fast, improves the high-temperature reliability of the magnet, and prolongs the service life of the magnet.

The invention discloses a core-shell type high-loss ferrite electromagnetic material and a preparation method thereof, the core-shell type high-loss ferrite electromagnetic material comprises a shell layer and a core layer, the shell layer is a carbon sphere, the core layer is an M-Ba ferrite material, and the mass ratio of the shell layer to the core layer is 1: (5-15); the molecular formula of the M-Ba ferrite material is BaFe < 12-x > Al < x > O < 19 >, wherein x is equal to 0.0 to 1.0. The characteristics of high-frequency application, high-temperature resistance, process stability and the like of BaFe < 12-x > Al < x > O < 19 > ferrite are utilized, the carbon spheres prepared from potato starch are combined for core-shell compounding, and the composite material has high loss constant and high temperature stability in a high-frequency band and can meet the application requirements of electromagnetic shielding and electromagnetic loss under high frequency.

This invention relates to a magnetostrictive guided wave sensor suitable for high-pressure / fluid-filled environments. The sensor comprises a tile-shaped permanent magnet, a detection coil, magnetostrictive patches, a magnetic yoke, hose clamps, an elastic layer, and a sleeve. The elastic layer wraps around the pipeline. Two arc-shaped magnetostrictive patches are symmetrically attached to the outside of the elastic layer. A circular hose clamp is fitted at each edge of the outer end of the magnetostrictive patch. A detection coil is wound around the outer surface of the magnetostrictive patch between the hose clamps. The detection coil is covered by a sleeve. Four evenly distributed fan-shaped slots on the sleeve each contain a tile-shaped permanent magnet. A strip-shaped magnetic yoke is fixed to each of the radial sides of each tile-shaped permanent magnet. The sensor obtained by this invention has higher transduction efficiency, and the novel guided wave sensor is suitable for monitoring pipeline defects in high-pressure fluid-filled environments.

The invention provides a room-temperature magnetic skyrmion, a two-dimensional ferromagnetic Co2Si / Co3Si nanosheet with a high Curie temperature characteristic and a preparation method and application of the two-dimensional ferromagnetic Co2Si / Co3Si nanosheet, and belongs to the technical field of magnetic materials. A cobalt source is placed in a low-temperature area, a silicon source is placed in a high-temperature area, a fluorine crystal mica sheet is placed above the silicon source in the high-temperature area, chemical vapor deposition reaction is carried out in an inert gas environment, and a two-dimensional ferromagnetic Co2Si nanosheet or Co3Si nanosheet with room-temperature magnetic skyrmion and high Curie temperature characteristics is obtained. The two-dimensional ferromagnetic Co2Si nanosheet and the Co3Si nanosheet have stable room-temperature ferromagnetism and relatively high Curie temperature, generation and annihilation of the room-temperature magnetic skyrmion can be realized through regulation and control of an external magnetic field, and the two-dimensional ferromagnetic Co2Si nanosheet and the Co3Si nanosheet have wide application prospects in the fields of spintronics, low-power-consumption information storage and the like; the method provided by the invention has the advantages of few types of raw materials, simple process, good repeatability and low cost, and is beneficial to large-scale production.