30 results about "Curie" patented technology

This invention discloses a high Curie temperature, high frequency, and high impedance manganese-zinc ferrite material and its preparation method, belonging to the technical field of soft magnetic ferrite materials. The manganese-zinc ferrite material consists of a main component and secondary components. The main component, calculated as oxides, comprises Fe2O3: 48.5–49.9 mol%, ZnO: 18.5–21.5 mol%, NiO: 0.5–2.0 mol%, with the remainder being MnO. The secondary components, by weight of the main component, include at least four of the following: Co2O3: 0.05–0.30 wt%, SiO2: 0.005–0.01 wt%, CaCO3: 0.02–0.05 wt%, ZrO2: 0.01–0.02 wt%, Bi2O3: 0.01–0.03 wt%, and V2O5: 0.01–0.05 wt%, mixed in any proportion. The resulting manganese-zinc ferrite material exhibits excellent properties such as high impedance.

There is described an aerosol-forming substrate for use in combination with an inductive heating device. The aerosol-forming substrate comprises a solid material which is capable of releasing volatile compounds that can form an aerosol upon heating of the aerosol-forming substrate and at least a first susceptor material for heating the aerosol-forming substrate. The at least first susceptor material is arranged in thermal proximity of the solid material. The aerosol-forming substrate further comprises at least a second susceptor material which has a second Curie-temperature which is lower than a first Curie-temperature of the first susceptor material. The second Curie-temperature of the second susceptor material corresponds to a predefined maximum heating temperature of the first susceptor material. There is also described an aerosol-delivery system.

The application relates to a preparation method of a high-dielectric high-Curie-temperature garnet ferrite without rare earth, which comprises the following steps: pre-treating raw materials to make the raw materials with different particle sizes basically reach the same particle size state, and then obtaining mixed materials with uniform components through mechanical stirring and one-time granulation, so that ideal pre-sintering effect can be realized. Meanwhile, three kinds of second grinding materials with different pre-sintering temperatures and particle sizes are uniformly mixed to control the sintering activity of the powder, and the sintering process is matched, so that the microstructure of the sintered body can be finally improved, the porosity of the ferrite material is reduced, and the ferromagnetic resonance line width is reduced. Through the combined substitution of bismuth, zirconium and calcium elements and the adjustment of the preparation process, the particle size of the powder is adjusted, the sintering stage is controlled to the end of continuous grain growth, the microstructure of the garnet ferrite material is improved, and finally the ferrite material with high dielectric constant, high saturation magnetization, low ferromagnetic resonance line width and high Curie temperature is prepared.

The application provides high-curie-temperature low-resistance lead-free thermosensitive ceramic and a preparation method thereof, and belongs to the technical field of electronic ceramic elements. 1‑x‑y La x (Bi 0.5 Na 0.5 ) y )(Ti 0.9996 Mn 0.0004 )O3; wherein the value range of x is 0.001<=x<=0.004, and the value range of y is 0.001<=y<=0.0075. The preparation method comprises the following steps: mixing (Bi 0.5 Na 0.5 )TiO3 powder synthesized by two-stage heating hydrothermal method, (Ba 1‑x La x )TiO3 powder synthesized by solid-phase reaction method, Mn(NO3)2 aqueous solution and sintering auxiliary agent AST powder, then performing granulation, molding, glue removal and sintering. The barium titanate-based thermosensitive ceramic prepared by the method has extremely low room temperature resistivity and relatively high curie temperature.

The present invention provides a sintered body having a high Curie point and exhibiting high magnetic permeability in a high frequency region. The sintered body comprises a spinel-type ferrite oxide having a main component of a metal element being Fe, Ni, Cu, and Zn, and further comprises Zr, Mn, Al, Co, and Cr, and when the molar fractions of Zn, Ni, Cu, Zr, Mn, Al, Co, and Cr, with Fe being 100 mol, are respectively set as a, b, c, d, e, f, g, and h, 100-a-b-c+2d+(1 / 2)e, a+b+c+d+e / 2, f, g, and h respectively satisfy the following formulas (1) to (5). 49.0 < 100-a-b-c+2d+(1 / 2)e < 50.0 (1) 50.2 < a+b+c+d+e / 2 < 52.7 (2) 0.0012 ≤ f ≤ 0.010 (3) 0.0005 ≤ g ≤ 0.0015 (4) 0.0005 ≤ h ≤ 0.004 (5).

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.

The invention relates to a passive temperature antenna sensor (10) comprising: - a plurality of layers of ferroelectric materials (12.1, 12.3, 12.4) arranged side by side on a carrier (11) made of an electrically conductive material, - the layers of ferroelectric materials (12.1, 12.3, 12.4) being made of different ferroelectric materials having different Curie temperatures each associated with a dielectric-constant peak, such that the antenna sensor (10) has multiple resonant frequencies corresponding to the Curie temperatures so as to cover a temperature measurement range, and - a plurality of electrically conductive layers (13.1, 13.3, 13.4) each deposited on a corresponding layer of ferroelectric material (12.1, 12.3, 12.4).

The application discloses a low-loss high-Curie-point bismuth ferrite-barium titanate lead-free piezoelectric ceramic material and a preparation method thereof. 1.02 FeO3-(0.25-x)BaTiO3-xCaZrO3+y%GeO2+z%MnO2; wherein x, y and z represent molar fractions, 0.005<=x<=0.020, 0.3<=y<=1, 0.5<=z<=1.5. The application introduces the third component CaZrO3, and adds GeO2 and MnO2, controls the crystal phase composition and the conductive carrier concentration, improves the microstructure, reduces the loss and improves the temperature stability, so that the Curie temperature, the depolarization temperature and the piezoelectricity are obviously improved. The lead-free piezoelectric ceramic material provided by the application has a simple synthesis process, and is expected to be applied to the preparation of high-temperature piezoelectric sensor devices.

A method for producing a working component for a magnetic heat exchanger, comprising: Selecting for each of the two or more sections of the working component of amounts of La, Fe, M and of one or more of the elements of T and R which are suitable to form a La 1-a R a (Fe 1-x-y T y M x ) 13 H z-phase, where T is one or more of the elements from the group consisting of Mn, Co, Ni and Cr, M is silicon and optionally aluminum, and R is one or more of the elements from the group consisting of Ce, Nd, Y and Pr, where the amount of silicon is within the range of 0.05 ≤ x ≤ 0.2 and the amount of one or more of the elements R and T is selected within the ranges 0 ≤ a ≤ 0.5 and 0.003 ≤ y ≤ 0.2, where the amount of the one or more elements of T and R and the amount of Si are selected for each of the two or more sections to provide the two or more sections with different Curie temperatures and similar sintering activities, Mixing the amount of the selected elements of T, R and M with La, Fe or alloys thereof in amounts suitable to produce the La 1-a R a (Fe 1-x-y T y M x ) 13 H z-phase to produce two or more precursor powder mixtures, Producing a green body from the two or more precursor powder mixtures, Heat treatment of the green body at a temperature T sinter and producing a working component having two or more sintered sections, each having a different T c and a density, d, within a range of ±5% or ±2% of the mean density, d av , a total number of sintered sections, wherein a single monolithic green body is formed from two or more precursor powder mixtures and heat treated to form a single monolithic working component having two or more sintered sections.

The invention relates to a passive temperature sensor-antenna (10) comprising: - a plurality of layers of ferroelectric materials (12.1, 12.3, 12.4) arranged side by side on a support (11) made of an electrically conductive material, - said layers of ferroelectric materials (12.1, 12.3, 12.4) being made of different ferroelectric materials having different Curie temperatures, each associated with a peak in dielectric constant, so that said sensor-antenna (10) exhibits several resonance frequencies corresponding to the Curie temperatures to cover a temperature measurement range, and - a plurality of electrically conductive layers (13.1, 13.3, 13.4) each deposited on a corresponding layer of ferroelectric material (12.1, 12.3, 12.4). Figure 4

The invention relates to a passive temperature sensor-antenna (10) comprising: - a plurality of layers of ferroelectric materials (12.1, 12.3, 12.4) arranged side by side on a support (11) made of an electrically conductive material, - said layers of ferroelectric materials (12.1, 12.3, 12.4) being made of different ferroelectric materials having different Curie temperatures, each associated with a peak in dielectric constant, so that said sensor-antenna (10) exhibits several resonance frequencies corresponding to the Curie temperatures to cover a temperature measurement range, and - a plurality of electrically conductive layers (13.1, 13.3, 13.4) each deposited on a corresponding layer of ferroelectric material (12.1, 12.3, 12.4). Figure 4

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.

Disclosed herein are magnetocaloric materials comprising alloys useful for magnetic refrigeration applications. The disclosed alloys include Dysprosium, Erbium, Holmium, Yttrium, or Terbium, and Cerium, Neodymium, and / or Gadolinium components that are fairly inexpensive. In certain embodiments, the materials exhibit second-order magnetic phase transitions near their Curie temperatures with negligible thermal and structural hysteresis losses, making them attractive for magnetic refrigeration. Surprisingly, the performance of the disclosed materials is comparable to or better than that of other expensive, rare-earth-based magnetocaloric materials.

The application discloses a preparation method of a high-entropy amorphous magnetic ring with a high Curie point, and the high-entropy amorphous magnetic ring comprises Co 25-30%, Fe 25-30%, Ni 15-20%, Si 10-15% and B 10-15% in terms of atomic ratio. The preparation method comprises the following steps: configuring a master alloy, repeatedly melting the master alloy for multiple times by using a vacuum induction furnace under certain temperature and time, ensuring that the components of the alloy ingot are fully uniform, and then using a single-roller rapid quenching method to prepare amorphous strip in a non-vacuum environment, and rolling the amorphous strip into a magnetic ring. The amorphous nanocrystalline magnetic ring obtained by the step-by-step heat treatment mode of ordinary heat treatment and longitudinal magnetic field heat treatment has a high squareness ratio, low coercivity and high saturation magnetic induction intensity, and is suitable for the fields of high remanence ratio switches, lock type devices, high-frequency inductors, photovoltaic transformers and the like.

The invention discloses an integrated energy conversion device based on cold and heat energy exchange and negative correlation characteristic coupling of temperature and magnetic force or magnetic conductivity characteristics, and relates to the technical field of energy conversion. The device comprises a temperature difference control magnetic force system, a cold and heat energy supply module, a cold and heat conduction path, an integrated control and power supply module and the like, and is directly thermally coupled through negative correlation characteristics of a cold and heat energy manufacturing system-temperature and magnetic force or magnetic conductivity characteristics, or a cold and heat energy manufacturing system-Curie effect dual-thermal coupling architecture. By utilizing the characteristic that the temperature is negatively correlated with the magnetic force or magnetic conductivity of a ferromagnetic substance and combining a cold and heat energy manufacturing system, the energy conversion is realized by supplying cold and heat energy of a magnetothermal effect or a refrigeration cycle.

The present application belongs to the field of electronic information functional materials and microelectronic devices, and relates to a microwave ferrite material, and particularly provides an LTCC high-curie-temperature NiZn ferrite substrate material and a preparation method thereof, to solve the defects of the existing low-temperature sintering NiCuZn ferrite substrate material, such as low curie temperature, high microwave magnetic loss and dielectric loss, low saturation magnetization and low dielectric constant; the present application uses Cu-doped high Ni / Zn ratio NiZn ferrite as a main material, and uses Bi2O3-CuO composite eutectic mixture as an auxiliary material, and the two are low-temperature co-fired to form a substrate material, which not only has a low sintering temperature (about 900 DEG C), but also has excellent microwave characteristics: high curie temperature (about 302 DEG C), low ferromagnetic resonance line width (about 100 Oe), low dielectric loss (loss tangent value about 8*10 ‑4 ) and high saturation magnetization (about 4959 Guass), which not only meets the requirements of the LTCC process, but also has excellent magnetic properties of the key substrate material required by the microwave ferrite device.

According to the low-cost high-magnetic-conductivity high-magnetic-shielding magnetically soft alloy and the preparation method thereof, Fe-Si-Al is adopted as a basic system, microalloying elements such as B and Nb are creatively introduced, specific critical cold rolling and magnetic field heat treatment processes are adopted, and the obtained magnetically soft alloy has high magnetic conductivity and high magnetic shielding effectiveness. Wherein the resistivity of the alloy is effectively improved and the magnetocrystalline anisotropy is optimized through the synergistic effect of Si and Al; the grain boundary segregation effect of the B element purifies the grain boundary, and the moving resistance of the magnetic domain wall is remarkably reduced; and the dispersed precipitated phase formed by the Nb element effectively refines the initial crystal grains and lays a foundation for subsequent formation of uniform and thick recrystallized crystal grains. Particularly, a strong Gaussian texture is induced through accurately controlled critical cold rolling deformation, and magnetic domains are directionally arranged in an easy magnetization direction in combination with magnetic field heat treatment applied near a Curie point, so that the coercive force is fundamentally reduced, and the initial magnetic conductivity is improved.

The invention belongs to the technical field of electronic ceramics, and particularly discloses a low-Curie-temperature medium-entropy lead magnesium tungstate-based ceramic and a preparation method and application thereof, the chemical general formula of the low-Curie-temperature medium-entropy lead magnesium tungstate-based ceramic is Pb (Mg < 1 / 4 > W < 1 / 4 > B '< 1 / 4 > B' < 1 / 4 >) O3, B '= Yb < 3 + > or Lu < 3 + >; b ''= Nb < 5 + > or Ta < 5 + >. According to the low-Curie-temperature medium-entropy lead magnesium tungstate-based ceramic and the preparation method and application thereof, the Curie temperature TC of the lead magnesium tungstate ceramic can be effectively reduced through the method, the dielectric constant is increased, low dielectric loss is kept, and the obtained ceramic has a pure perovskite structure and good compactness; the phase change temperature of the lead magnesium tungstate-based antiferroelectric ceramic ranges from-11 DEG C to-24 DEG C, the maximum relative dielectric constant ranges from 800 to 1100, the maximum dielectric loss tan delta ranges from 0.05 to 0.065, and the problems that an existing lead magnesium tungstate-based antiferroelectric ceramic is high in phase change temperature and low in dielectric constant can be solved.

A manufacturing method for a permanent magnet includes a magnetization step of magnetizing a to-be-magnetized object by a magnetizer including a field magnet unit having a plurality of permanent magnets for magnetization configured to generate a magnetic field on the to-be-magnetized object arranged at equal intervals and a heating unit having a heating surface opposing the to-be-magnetized object in an axial direction of the to-be-magnetized object and configured to heat the to-be-magnetized object. In the magnetization step, the to-be-magnetized object is disposed on the field magnet unit, the to-be-magnetized object is heated by the heating unit to a temperature equal to or higher than a Curie point of the to-be-magnetized object and lower than the Curie point of the permanent magnets for magnetization, and then the temperature is lowered to a temperature lower than the Curie point of the to-be-magnetized object, and a magnetization magnetic field is applied to the to-be-magnetized object by the permanent magnets for magnetization.

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 embodiment of the invention relates to the technical field of emergency protection devices of reactors, in particular to an armature assembly, a passive shutdown device and a reactor. The armature assembly comprises an inner armature, an outer armature, an armature sheath and Curie point soft magnetic alloy. Along the radial direction of the inner armature, the armature sheath is fixedly arranged between the outer armature and the inner armature. The Curie point soft magnetic alloy is fixedly connected with the inner armature, and the magnetic force borne by the Curie point soft magnetic alloy at the position where the Curie point soft magnetic alloy is located is the maximum. By means of the armature assembly, when the temperature in a reactor is lower than the Curie temperature of a Curie-point magnetically soft alloy, it can be ensured that the armature assembly is stably attracted by electromagnetic force generated by the electromagnet assembly, accidental falling of the armature assembly is avoided, and when the temperature in the reactor rises to the Curie temperature, the armature assembly and the electromagnet assembly can be rapidly demagnetized, and the electromagnetic effect is improved. Therefore, the armature assembly drives the control rod to fall into the reactor core, rapid and safe reactor shutdown is realized, and the reliability and sensitivity of the passive reactor shutdown device are improved.

The application provides a high-precision inversion method for the crustal interior based on aeromagnetic data, which comprises the following steps: preprocessing the aeromagnetic data of a target area, eliminating noise and interference, and extracting regional magnetic anomaly information related to the deep crustal interior; constructing a residual magnetization strength model based on a depth attenuation function, and obtaining the residual magnetization strength of each grid point in the target area according to the target area and the residual magnetization strength model; establishing a nonlinear decay model of the residual magnetization strength with depth based on the residual magnetization strength model, and obtaining the magnetic anomaly strength generated on the ground by each depth layer in the target area by using the nonlinear decay model; and inputting the regional magnetic anomaly information, residual magnetization probability parameters, geological constraints and magnetic anomaly strength into a crustal interior inversion model to obtain the depth prediction value of the target area. The application considers the influence of residual magnetization on the magnetization direction, and improves the inversion precision of the crustal interior.

The invention discloses a low-loss high-Curie-temperature high-permeability manganese zinc ferrite material and a preparation method thereof, and belongs to the technical field of manganese zinc ferrite materials. The manganese zinc ferrite material with low loss, high Curie temperature and high magnetic permeability is composed of a main component and an additive, and the main component is composed of the following raw materials in molar percentage: 50.5-54.5 mol% of Fe2O3, 17.5-27.5 mol% of MnO and the balance of ZnO; on the basis of the total weight of the main components, the additive is prepared from the following raw materials in content: 400 to 600 ppm of V2O5, 600 to 800 ppm of Bi2O3, 700 to 800 ppm of Nb2O5, 1400 to 1600 ppm of MoO3, 1300 to 1500 ppm of TiO2, 800 to 1100 ppm of CaCO3 and 700 to 1200 ppm of SiO2. According to the invention, the problem that the initial permeability, loss and Curie temperature of the manganese-zinc ferrite cannot be synergistically optimized in the prior art is solved.

The invention discloses a flexible low-Curie-point positive temperature coefficient material and a preparation method thereof. The flexible low-Curie-point positive temperature coefficient material comprises the following raw materials: an elastic resin matrix, a low-phase-change-point organic phase change material, a conductive filler and a cross-linking agent. The preparation method comprises the following steps: melting the low-phase-change-point organic phase-change material to obtain liquid A; dispersing an elastic resin matrix in the liquid A to form liquid B; uniformly mixing the liquid B, a cross-linking agent and a conductive filler, and completing cross-linking to obtain a paste positive temperature coefficient material C; and pouring the paste positive temperature coefficient material C into a mold, cooling and demolding. The preparation method disclosed by the invention is simple in system, only needs normal-pressure low-speed stirring, does not need precise equipment such as a vacuum kettle and an internal mixer, and does not contain pollutants such as an organic solvent. The prepared positive temperature coefficient material has a Curie point near the room temperature and good flexibility, and the problems that a traditional positive temperature coefficient material cannot be used at a low temperature and is too hard and too brittle in texture are solved.

The invention relates to a powder sleeve assembly and a process for preparing a core filling micropore ultra-thin strip in a rolling mode through the powder sleeve assembly, and belongs to the technical field of metal machining and material preparation.The powder sleeve assembly comprises a hollow sleeve and a middle interlayer arranged in the hollow sleeve, and an alloy layer for filling the uppermost layer of the hollow sleeve is arranged on the middle interlayer; a middle interlayer is arranged in the hollow sleeve, a ferromagnet layer filling the lowermost layer of the hollow sleeve is arranged below the middle interlayer, the alloy layer is made of nickel-based alloy powder, the ferromagnet layer is made of ferromagnet powder including 1 / 4 nickel-based alloy powder and 3 / 4 ferromagnet powder, and by means of the large-deformation rolling technology and the heat treatment technology, the induction function of all the layers can be not affected, and meanwhile the induction function of all the layers is not affected. Metallurgical bonding is achieved by internally filling the sensing material, and meanwhile gradient sensing materials with different Curie temperatures are successfully obtained.

The application discloses a high-Tc high-permeability manganese-zinc ferrite material and a preparation method thereof, and belongs to the technical field of manganese-zinc ferrite. The high-Tc high-permeability manganese-zinc ferrite material is prepared from the following raw materials: main components including Fe2O3, ZnO and MnO, and the total amount of the three components is 100%; and the material contains composite modification additives, specifically La2O3, SrO, BaO, SiO2 and CaO. In the application, rare earth-alkaline earth gradient composite doping is adopted for the first time, La, Sr and Ba are introduced after pre-sintering, and secondary ball milling is used to uniformly coat the active pre-sintered material on the surface. During sintering, La is balancedly distributed between the crystal lattice and the grain boundary to improve the Curie temperature, Sr and Ba completely play the function of magnetic conduction in the grain boundary, and the two do not conflict with each other in space and time, thereby breaking the bottleneck of the traditional high-permeability and high-Curie-temperature which are difficult to be obtained simultaneously, and synchronously realizing the great improvement of the Curie temperature and the permeability, and breaking the inherent technical bottleneck in the industry.

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.

The invention discloses a method for enhancing the piezoelectric property of a PZT film through rapid annealing, which comprises the following steps: 1) in a vacuum environment of a sputtering chamber of magnetron sputtering equipment, depositing a PZT film with a crystal structure on a substrate which is heated to a set temperature by a PZT target material; (2) the PZT film is taken out of a sputtering cavity of the magnetron sputtering equipment and then put into a hearth of a rapid annealing furnace, the hearth of the rapid annealing furnace is vacuumized, the PZT film is annealed in a vacuum environment and then cooled along with the furnace, the annealing temperature is larger than the Curie point of the PZT film, and therefore phase structure reconstruction and ferroelectric domain reorientation of the PZT film are achieved; therefore, the transverse piezoelectric coefficient of the PZT film is improved. According to the method, the PZT film deposited on the substrate is crystallized to form a crystal structure, the PZT film is annealed and heated to the Curie point or above, phase structure reconstruction and ferroelectric domain redistribution of the PZT film are achieved, and the transverse piezoelectric coefficient of the PZT film is greatly improved.

The invention belongs to the technical field of piezoelectric ceramics, and particularly relates to a low-temperature co-fired piezoelectric ceramic with high Curie temperature and high piezoelectric constant and a preparation method thereof, the structural general formula of the ceramic is (1-a) Pb (ZrzTi1-z) x (Mg1 / 2W1 / 2) y (Zn1 / 3Nb2 / 3) 1-x-yO3 + a (Na1 / 2Bi1 / 2) TiO3, x is equal to 0.85-0.95, y is equal to 0.02-0.05, z is equal to 0.45-0.55, a is equal to 0.02-0.1, 1-x-y is not zero, a Pb (Zn1 / 3Nb2 / 3) O3 system and Pb (ZrzTi1-z) x (Mg1 / 2W1 / 2) yO3 in the components form a morphotropic phase boundary Compared with other common ternary and quaternary components, the Pb (Zn1 / 3Nb2 / 3) O3 system has higher Curie temperature and lower dielectric constant, and is doped with a (Na1 / 2Bi1 / 2) TiO3 system with high Curie temperature to ensure that the ceramic has high Curie temperature. The piezoelectric ceramic prepared by the invention has the characteristics of high Curie temperature, high piezoelectric constant, fine and uniform crystal grains, compact structure and stable performance parameters, and the preparation process has the characteristics of simple process, low equipment requirement, low cost and low sintering temperature.