6 results about "Curie" patented technology

The application relates to the technical field of magnetocaloric materials, and discloses a low-curie-temperature iron-based magnetocaloric material, a preparation method, a deicing agent and a coating. The magnetocaloric material takes iron as the main body, introduces rare earth elements, transition group elements and metalloid elements to form a synergistic component system, and has the characteristics of adjustable curie temperature and high saturation magnetic induction intensity. The preparation method comprises the following steps: alloy smelting and high-temperature homogenization heat treatment, block pretreatment, segmented parameter control hydrogen crushing, and gradient temperature rising high-vacuum dehydrogenation. Through the hydrogenation process combining low-temperature permeation, high-pressure crushing and heat preservation and refinement, the uniform and controllable crushing of the alloy is realized, and the residual hydrogen content is effectively reduced in the multi-stage dehydrogenation process. The application can significantly improve the problems of serious oxidation, uneven particle size and magnetic performance attenuation existing in the traditional mechanical crushing or conventional hydrogen crushing process. The obtained magnetocaloric material shows high saturation magnetic induction intensity and stable magnetocaloric performance in the low curie temperature interval.

This invention relates to a method for preparing tritelluride microsheets, comprising the following steps: Step 1, M... 2+ and / or M 3+ A precursor solution is obtained by dissolving the precursor solution in an organic solvent. Tri-n-octylphosphine and Te are then mixed to obtain a mixed solution; M is at least one of Cr, V, and Gd. Step two: The precursor solution and the mixed solution are stirred and reacted to obtain MTe3 seed crystals. Step two: The MTe3 seed crystals are added to the precursor solution and then to the mixed solution for further reaction to obtain tritelluride microsheets. This method allows for balanced and controllable crystal growth, significantly improving the lateral dimensions and crystal integrity of the CrTe3 microsheets. The CrTe3 microsheets prepared using this method exhibit excellent structural integrity, with lateral dimensions ranging from 2 to 200 μm, and demonstrate intrinsic ferromagnetic behavior at high Curie temperatures, providing a new technical approach for the large-scale fabrication of high-performance two-dimensional magnetic materials and spintronic devices.

This invention discloses a high Curie point, low voltage, and low resistance ceramic PTC element, its preparation method, and its application, relating to the field of ceramic PTC technology. The invention uses a solid solution system composed of barium titanate and lead titanate as the main components, controlling the molar ratio of barium to lead within the range of 0.63-0.70:0.30-0.37. This allows the Curie point of the material to be stably distributed in the high-temperature range of 240℃ to 280℃. By optimizing the doping system, a high temperature coefficient of resistance and a high step-up resistance ratio are maintained while achieving low room temperature resistance. The invention employs separate pre-firing methods, allowing barium titanate and lead titanate to be synthesized and semiconducted separately under their respective optimal temperature conditions, ensuring precise control of the Curie point. This avoids localized inhomogeneities caused by difficulties in solid solution during final mixing, achieving controllable and repeatable product performance, suitable for large-scale production. This invention successfully solves the problems of high Curie point, low voltage, and low resistance PTC element preparation difficulty and unstable performance in existing technologies, and has good prospects for industrial application.

An active magnetic regenerator according to one embodiment comprises: a housing; a plurality of magnets disposed outside the housing; a Peltier element disposed inside the housing; a plurality of magnetocaloric materials disposed in a line on both sides of the Peltier element inside the housing and having different Curie temperatures; a plurality of connectors connecting each of the plurality of magnetocaloric materials to the Peltier element; a power supply unit for supplying power to the Peltier element; and a controller for controlling the power supply unit.

The application provides a wideband high-impedance high-Curie-temperature manganese-zinc ferrite material which is prepared from main components, auxiliary components and additives; the main components are composed of Fe2O3 51.8-52.5 mol%, ZnO 19.4-20.2 mol% and the rest is Mn3O4 in terms of mole percentage; the auxiliary components include CaCO3 400-600 ppm, SiO2 100-200 ppm, V2O5 500-700 ppm, SnO2 300-400 ppm and WO3 100-200 ppm in terms of the total mass of the main components; and the additives include LiCl 100-200 ppm in terms of the total mass of the main components. The formula of the manganese-zinc ferrite and the preparation process thereof are reasonably limited, and finally the manganese-zinc ferrite material with excellent comprehensive performance is prepared.