87results about How to "High magnetostrictive performance" patented technology

A magnetostrictive Fe-Ga alloy wire with better mangetostrain power [(21-118) *10 to the power -6] is prepared through smelting, casting rod, hot spinning forging, and cold drawing.

A preparation technology of a high-performance quick-quenching Fe-Ga based magnetostriction thin strip material is disclosed. The material compositions comprise: Fe100-x-yGaxMy, M represents one or more of Tb, Dy, La, Ce, Y, Al and Mn, wherein x=5-25, y=0.05-15, and the thickness of the thin material is 50 [mu]m-150 [mu]m. According to the preparation technology, melt-spinning and quick-quenching are carried out by employing a vacuum copper roller quick-quenching furnace, and heat treatment is carried out. The advantages are that: the developed Fe-Ga based magnetostriction thin strip material possesses excellent magnetostriction performance, better intensity and corrosion resistance, which can be used in severe environment; the thin strip produced by using the preparation technology is good in flatness and linearity, when the applied magnetic field is perpendicular to the thin strip surface, the thin strip possesses extremely high magnetostriction performance along the thin strip surface direction, and the magnetostriction coefficient reaches -1500*10<-6>; and the thin strip material is simple in preparation technology and high in strip-forming rate, and is beneficial to popularization and application.

The invention relates to a high-performance polycrystalline texture Fe-Ga-based magnetostrictive thin material and a preparation method thereof; the component of the material is Fe100-x-y-zGaxMyNz; M stands for one or more among B, Nb, Cr, VC, TiC, MnS and AlN; N stands for one or more among S, Sb and Sn; wherein, x is equal to 15-25; y is equal to 0.5-3.0; z is equal to 0.01-0.05; and the residual is iron. The method has the following process key points: based on the requirements of the material composition, melting master alloy; casting alloy ingot; hot-forging and cogging; rolling the material into the appropriate thickness; and a variety of follow-up heat treatment. The Fe-Ga-based magnetostrictive thin material has obvious (100)<001>cubic texture or (110) <001> goss texture; and the maximum magnetostriction coefficient (3/2)lambdas is up to 280 multiplying 10<-6>.

The invention relates to a giant magnetostrictive large volume Fe81Ga19 alloy material and a preparation method thereof, belonging to the technical field of the alloy material and the atom percent of the alloy material is Fe81at.% and Ga19 at.%; the preparation method comprises the steps of Fe element and Ga element arc melting, solidification remelting superheat cycle process and high undercooling activation unidirectional solidification. The invention adopts high undercooling activation process so that Fe-Ga alloy blocks can be obtained while the alloy has the giant magnetostrictive property. The magnetostrictive strain of the Fe-Ga alloy blocks is above 500*10 generally and the maximum magnetostrictive strain can reach 830*10.

The invention relates to an universal gripper using a magneto-rheological plastic body. The universal gripper comprises a U-shaped supporting frame, a coil, a partitioning plate and a partitioning layer, wherein the coil is wound at the middle part of the supporting frame; the partitioning plate is arranged at the middle part of the supporting frame; the partitioning layer is formed among the partitioning plate, the coil and the U-shaped supporting frame; a charging battery and a current control circuit are placed in the partitioning layer; a rubber jacket is tightly coated outside; the high-performance magneto-rheological plastic body is filled between the U-shaped bracket and the rubber jacket. The universal gripper has the advantages that the gripping force can be adjusted; the shape of the gripper can be changed to enable the gripper to be better attached to the surface of an object; in addition, the whole structure is simple and the manufacturing cost is lower.

The invention discloses a high temperature radiation resistant magnetostriction alloy as well as a preparation method thereof. The alloy comprises the following chemical components in percent by weight: 43.0-66.0% of Ni, 0-5.0% of Cr, 1.0-3.5% of Mo, 1.0-3.0% of Ti, 0-1.0% of Al and the balance of Fe. The high temperature radiation resistant magnetostriction alloy disclosed by the invention has higher Curie temperature, good magnetostriction performance in a wider temperature range and great saturated magnetostriction coefficient, is excellent in resistance to radiation in a reactor and free from irradiation activation or disintegration caused by high dose of neutrons or gamma rays, and can satisfy the using demands of great irradiation dose at high temperatures of a reactor core of the reactor.

The invention discloses a preparation method for magnetostrictive material and the magnetostrictive material. The preparation method for the magnetostrictive material includes that providing raw material nanometer powder slurry; extruding the slurry, accumulating in linear shape to form a pre-designed three-dimensional model to obtain a sample blank; drying and sintering the sample blank to obtain the cured magnetostrictive material. The preparation method for the magnetostrictive material realizes to manufacture the magnetostrictive material through a three-dimensional mold-less slurry direct-write forming technique, the technique is simple and controlled through program, and different slurry and structure models can be prepared according to needs; the preparation method for the magnetostrictive material manufactures the magnetostrictive material with the complex grid structure in one time, and accordingly the production cost is lowered, the agility is improved, and the magnetostrictive characteristic is greatly improved.

The invention belongs to the technical field of electronic components, and discloses a bi-directionally adjustable magnetoelectric inductor, comprising a layered magnetoelectric composite element anda copper coil uniformly wound around the periphery of the layered magnetoelectric composite element. The layered magnetoelectric composite element comprises a rectangular ferromagnetic element and a rectangular piezoelectric element, wherein the rectangular ferromagnetic element forms a sandwich-shaped symmetrical structure on the upper and lower sides of the rectangular piezoelectric element; andthe material of the rectangular ferromagnetic element is a Ga-doped nickel-zinc ferrite material, and the material of the rectangular piezoelectric element is PZT-8. Elongation or shortening of a magnetostrictive layer is caused by an additional electric/magnetic field to change the magnetic permeability so as to correspond to the increase or decrease of the inductance of a peripheral closely-wound coil, thereby realizing the bi-directional adjustability of inductance under the control of an external field, the adjustment mode is expanded and the application range of the adjustable inductanceis expanded.

The invention relates to a Fe-Al-B magnetostrictive thin piece material and a preparation method thereof. The components (atom fraction) of the material meet the formula that Fe100-x-yAlxBy, wherein x is equal to 15-26, y is equal to 0.03-0.5, and the balance is Fe. The obtained Fe-Al-B magnetostrictive thin piece material has strong goss texture and has excellent magnetostrictive performance along the rolling direction.

The invention provides a high-plasticity magnetostrictive material and a preparation method of the high-plasticity magnetostrictive material. The chemical formula of the high-plasticity magnetostrictive material is Fe100-xGaxREy, wherein x is larger than or equal to 16.9 and smaller than or equal to 20.6 or is larger than or equal to 22.5 and smaller than or equal to 28.5, y is larger than or equal to 0.01 and smaller than or equal to 1, and RE is selected from one or more of Tb, Dy, Ho, Nd, Pr and Ce. After the Fe, Ga and RE raw materials which are prepared according to ingredient requirements are smelted to be a master alloy ingot, the master alloy ingot is smelted and prepared to be a master alloy bar through vacuum suction casting, then, the master alloy bar is placed into a crucible sleeved with a heat insulation sleeve, the master alloy bar is heated to be completely smelted, the smelted materials are drawn into cooling liquid for directional solidification, and the high-plasticity magnetostrictive material is prepared. The high-plasticity magnetostrictive material has both the excellent magnetostriction property and mechanical property.

The invention discloses a method for preparing a large magnetostriction alloy wire, which comprises the following steps: (1) smelting of a cast rod; (2) uniformity of the compositions; (3) milling; (4) cold rolling; (5) wire cutting; (6) relief annealing; (7) cold drawing; and (8) recrystallization annealing. The method adopts a plastic working process combining cold rolling and cold drawing and can prepare the novel Fe-Mn magnetostriction alloy wire with large magnetostriction at the room temperature. The alloy comprises the following compositions and atoms in percentage: 30 to 60 percent of iron and 70 to 40 percent of manganese. The Fe-Mn magnetostriction alloy wire can generate large magnetostriction between 456 and 1,660 ppm in the environment of 1.2T external magnetic field. The preparation method has low energy consumption, reduces the production cost of the Fe-Mn alloy wire, can adjust the size of the alloy wire within a large range, is convenient for the design of miniature devices, and widens the use field of magnetostriction materials.

The invention discloses a spherical shell laminar magneto-electric composite material structure and a manufacturing method, and relates to the design and manufacture method of an isotropic magneto-electric effect laminar magneto-electric composite material structure. The method comprises the following steps: hemispherical shell piezoelectric ceramic is achieved through compression molding and sintering, after the high-temperature polarizing is performed, metallizing is performed by adopting the chemical plating method, two metallized piezoelectric ceramic hemispherical shells are bonded into a complete piezoelectric ceramic hemispherical shell through the strong glue, and then the shell is laid in the prepared electroplating solution to be electroplated till a magnetic layer with the required thickness is electroplated, thereby the spherical shell laminar magneto-electric composite material is achieved. Compared with the prior simple laminar composite material, such as a flat plate, because the dimensions of the structure in the three-dimensional direction are identical, the magneto-electric performances of the structure in all directions are identical, and by adopting the isotropic magneto-electric performance, the spherical shell laminar magneto-electric composite material can be applied to the magnetic field detection in the unknown directions.

The invention discloses a high-performance rare-earth-iron-based giant magnetostrictive material and a preparation method thereof, and belongs to the technical field of magnetic functional materials.The method comprises the following steps that 1, induction smelting is carried out on a (TB1-XMX) fey alloy, M is equal to at least one of Dy, Sm, Ce, Pr, Nd, Ho and Er, X is equal to 0 to 0.70, and Yis equal to 1.75-2.25; 2, the alloy is placed in an inert gas and gradient strong magnetic field environment, and the alloy is at least heated to 150 DEG C above the liquidus temperature, and the temperature is kept for at least 8 minutes; and 3, the rate of 5-120 microns per second is taken, then an alloy liquid is pulled into a liquid metal cooling liquid to achieve directional solidification,and after the temperature of a heating chamber is cooled to the room temperature, the sample is taken out. The prepared magnetostrictive material has the advantages of high mechanical property, the large magnetostriction coefficient and the like; and the method has the advantages that operation is simple, control is accurate, the product performance is excellent, and the high-performance magnetostriction material can be produced in batches.

The invention relates to a method for preparing an Fe-Ga-In-Tb alloy by double-feeding vacuum induction smelting. According to the method, high-purity Fe, Ga, In and Tb are used as raw materials to prepare the mother alloy of which the target composition is Fe100-(x+y+z)GaxInyTbz. The method comprises the following steps: putting high-purity iron in a quartz crucible without holes in the bottom, and carrying out induction smelting by using a vacuum induction smelting furnace; after the iron is molten, adding In, Tb and Ga by in a double-feeding mode, and continuing applying power for smelting; and taking out, putting in a quartz crucible with a hole in the bottom, resmelting in the vacuum induction smelting furnace, and casting. In the casting process, a lifting accelerator is utilized, so that the alloy solution acquires a certain inertia, and thus, the alloy solution can be completely cast into a high-volume red copper mold to be subjected to forced cooling. The resmelting is repeated 3-4 times, so that the smelted alloy has more uniform composition. The alloy prepared by the method provided by the invention has the advantages of low burning loss, smooth surface, uniform composition and obviously higher casting properties.

The invention discloses a high-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and a preparation process thereof. Holes are introduced into an Fe73Ga27 alloy by preparing a porous sodium metaaluminate precursor so as to ensure that the magnetostrictive performance of the Fe73Ga27 alloy can be improved; the pore size is 20-100 microns, and the porosity is 30-50%; and the preparation process comprises the following step: performing spray casting in a copper mold by using a vacuum spray casting furnace. According to the high-performance macroscopic foam-state Fe73Ga27 magnetostrictive material and the preparation process thereof disclosed by the invention, the hindering effect of magnetic domain rotation in Fe73Ga27 can be reduced based on introduced pores, the macroscopic foam-state Fe73Ga27 magnetostrictive material can be developed, and large magnetic-induced strain, low driving fields and relatively high mechanical performance can be achieved; and a foam material prepared by using a method disclosed by the invention is uniform in pore, ensures that the magnetostrictive coefficient exceeds 300ppm, also is simple and convenient in process and high in finished product rate, and is beneficial to popularization and application.

A hydrogen charge-in method to a super magnetostrictive material (Tb,Dy)Fe2 includes the following steps: put the rod of Tb0.3Dy0.73Fe1.95 with an orientation of [110] into the hydrogen charge-in chamber; vacuum the chamber around 10Pa; clean the chamber with hydrogen; charge-in hydrogen at a pressure of 0.1-10 atm and temperature at 20-300oC for 1-24hr.

The invention discloses a giant magnetostrictive vibration source which comprises an exciting coil (5), a magnetostrictive material rod (6) is arranged in the exciting coil (5) in the axial direction, an elastic vibration output piece (14) is arranged in the telescopic end direction of the magnetostrictive material rod (6), and a limiting end cover (3) is arranged at the end, away from the telescopic end, of the magnetostrictive material rod (6), when the magnetostrictive material rod (6) deforms in the direction of the telescopic end under the action of the excitation coil (5), the detection end of the elastic vibration output piece (14) moves in the deformation direction of the elastic vibration output piece (14). By transmitting a step excitation signal to the excitation coil, the giant magnetostrictive material rod is triggered to excite so as to generate vibration.

The invention relates to a magnetostrictive alloy with excellent mechanical performance and a preparation method for the magnetostrictive alloy and belongs to the technical field of magnetic materials. For Fe 100-x(NiCoMn)x as an alloy provided by the invention, x is equal to 13-37, and the alloy has excellent mechanical performance and low driving field while good magnetostriction performance isensured; and moreover, the alloy is simple, convenient and rapid in preparation process, low in defect rate and high in rate of finished products, is environmentally friendly, does not need to use expensive large-scale instrument equipment and can be popularized and applied in industrial production with low cost.

The invention relates to a method for preparing Co-Gd alloy capable of improving soft magnetic performance, which is characterized by comprising the steps of fusing Co with purity of 99.99% and Gd with purity of 99.9% under protection of high-pure Ar gas to obtain alloy; preparing an alloy thin belt from the fused alloy; and placing the prepared alloy stripe into a tubular furnace and introducingAr gas into the tubular furnace, and annealing at 422 to 1175 degrees centigrade. According to the invention, structure regulation and dislocation cancellation occur after the alloy stripe is annealed; the coercive force is reduced; the saturated magnetization intensity is improved; and the soft magnetic performance is enhanced obviously. As a result, it is possible to widely apply the Co-Gd alloy to the magnetostriction field. The method disclosed by the invention has advantages of simple procedures, convenient treatment, quick and convenient forming. Simultaneously, the method solves the application limitation caused by high coercive force and can be widely applied to the magnetostriction field.