247results about "Magnetostrictive material selection" patented technology

Apparatus includes a magnetostrictive actuator of a medical ultrasound transducer assembly. The actuator comprises a magnetostrictive alloy chosen from a list. A medical ultrasound handpiece includes an ultrasound transducer assembly adapted to attachingly receive an end effector. The transducer assembly includes a magnetostrictive actuator having a magnetostrictive alloy, and includes a first coil surrounding the actuator and adapted to excite the actuator to substantially a desired medical resonant frequency and substantially a desired medical amplitude. A medical ultrasound system includes a handpiece housing, a first medical ultrasound transducer assembly, and a first medical end effector attachable to the first transducer assembly. The first transducer assembly includes a magnetostrictive first actuator having a first magnetostrictive alloy. At least a portion of the first transducer assembly is attachingly insertable in the handpiece housing without the use of tools, without damaging the handpiece housing, and without damaging the first transducer assembly.

An elongate structure having a magnetostrictive material composition is subjected to tensile stress in the longitudinal-axial direction, thereby generally orienting the magnetization of the elongate structure in the longitudinal-axial direction. Electrical current is conducted through the elongate structure and / or through at least one adjacent elongate conductor, thereby generally orienting the magnetization of the elongate structure in the transverse direction, generally in parallel with the transverse direction of the magnetic field concomitant the conduction of current through the elongate structure. The elongate structure magnetostrictively contracts due to the (generally 90°) repositioning of the magnetization of the elongate structure. Examples of inventive configurational variants include: (i) an elongate structure itself conducting current; (ii) a hollow elongate structure accommodating placement therethrough of at least one elongate conductor; (iii) an elongate structure flanked by a pair of elongate conductors conducting current in opposite directions; (iv) plural elongate structures bordering a centralized elongate conductor.

A magnetostrictive composite having large magnetostriction by virtue of 2-50 vol. % magnetostrictive particles dispersed throughout a resin matrix formed from a thermosetting resin, an amine curing agent, fumed silica and a flexibilizing agent, wherein the magnetostrictive particles are aligned in the direction of their magnetic easy axes by the presence of a magnetic field prior to or during curing of the resin matrix. In an exemplary embodiment, an epoxy-Terfenol composite is formed by mixing an epoxy resin, fumed silica, a cycloaliphatic amine curing agent, and a flexibilizing agent that is a flexible diepoxide of EEW 390-470 or a mixture of a high molecular weight polyamine of MW 2000-5000 and a low molecular weight polyamine of MW 230-450 with Terfenol particles and curing the mixture in the presence of a magnetic field.

In the step of sintering a compact that is finally to be a magnetostrictive element, when the temperature in a furnace is elevated, the atmosphere in the furnace is evacuated by a vacuum pump to keep the pressure in the furnace at negative pressure in a temperature range that allows thermal decomposition of hydride present in the compact to release hydrogen gas to accelerate release of hydrogen from the compact.

This invention relates to a magnetic material. The components of material are Fe100-x-yGaxMyQ where x=10-40, M is Al, Be, Cr, In, Cd, Mo, Ge, y=0-15, Q is C, N, O additional doping. Main points of its technique are according to the requirement of the invented material components to smelt the mother alloy in a magnetic suspension over or vacuum induction furnace, to process monocrystal or polycrystal oriented materials with the high-temperature gradient quick directional solidification or czochralski or Bridgeman method under 1000-1200 deg.C for 1-48 hours then cool to 750-600 deg.C in the furnace and keep temp. for 0.2-48 hours, then quenching with water, or cool furnace to room temperature with different cooling speed for 750 to 600 deg.C or apply 500-20000 e magnetic field in the cooling process.

The present invention employs an optimized cross-sectional shape for a ferromagnetic shape memory alloy (FSMA) composite that is used in a spring-type actuator, an improved hybrid magnetic trigger for use in FSMA based actuators, an a FSMA composite based spring type actuator, an a FSMA based spring type actuator including a stack of triggering units and FSMA springs, a FSMA composite based torque actuator. The invention also includes a model that can be employed to evaluate different materials being considered as components a FSMA for a FSMA composite used in either a FSMA based torque actuator or a FSMA spring actuator.

The present invention employs an optimized cross-sectional shape for a ferromagnetic shape memory alloy (FSMA) composite that is used in a spring-type actuator, an improved hybrid magnetic trigger for use in FSMA based actuators, an a FSMA composite based spring type actuator, an a FSMA based spring type actuator including a stack of triggering units and FSMA springs, a FSMA composite based torque actuator. The invention also includes a model that can be employed to evaluate different materials being considered as components a FSMA for a FSMA composite used in either a FSMA based torque actuator or a FSMA spring actuator.

Textured PMN-PZT fabricated by templated grain growth (TGG) method has a piezoelectric coefficient (d) of 3 to 5 times that of its random counterpart. By combining this TGG method with low-temperature co-firing ceramics (LTCC) techniques, co-fired multilayer textured piezoelectric ceramic materials with inner electrodes were produced at a temperature as low as 925° C., which silver could be used. Trilayer PMN-PZT ceramics prepared by this method show a strain increase of 2.5 times, a driving voltage decrease of 3 times, and an equivalent piezoelectric coefficient (d*) improvement of 10 to 15 times that of conventional random ceramic counterparts. Further, a co-fired magnetostrictive / piezoelectric / magnetostrictive laminate structure with silver inner electrode was also synthesized. The integration of textured piezoelectric microstructure with the cost-effective low-temperature co-fired layered structure achieves strong magnetoelectric coupling. These new materials have promising applications including as actuators, ultrasonic transducers, and use in energy harvesters.

Magnetostrictive particulate composites with a preferred crystal orientation of the particles and methods for their manufacture are described. In a representative embodiment, a 25% volume Terfenol-D fraction polymer matrix composite was fabricated in a magnetic field using geometric anisotropy to orient needle shaped particles with long axis [112] orientation along the length of the composite. Results demonstrate that the magnetostriction of a [112] oriented particle composite saturates near 1600 ppm. This is a significant increase when compared to composites without preferential orientation (1200 ppm) and represents the largest reported magnetostriction for a particulate composite material.

The invention relates to an Fe-Ga based magnetostrictive wire and a preparation method thereof. The raw material component used by the method is (Fel-x-yGaxMy)l-z(NC)z, wherein M is selected from one or more types of all transition elements other than Fe, B, Be, Al, In, Ge, Sn, Sb, Bi, Pb, S and Se, and N is Nb, Ti, Si, Zr, Mo and the like, x is equal to 0.10 to 0.30, y is equal to 0.00 to 0.05, z is equal to 0.00 to 0.02, and the balance Fe. The method processes an Fe-Ga alloy into a finished wire through cold- or warm-hydrostatic extrusion. The invention solves the problems of poor plasticity, larger flow friction resistance and high processing cost when in Fe-Ga alloy plastic processing. The diameter of the prepared Fe-Ga based magnetostrictive wire is between 0.01mm and 2mm, the surface finishment is high, and the magnetostrictive properties under the low-magnetic field environment can reach 180*10-6.

A method for producing an RE-containing alloy represented by formula R(T1−xAx)13−y (wherein R represents Ce, etc.; T represents Fe, etc.; and A represents Al, etc; 0.05≦x≦0.2; and −1≦y≦1) including a melting step of melting alloy raw materials at 1,200 to 1,800° C.; and a solidification step of rapidly quenching the molten metal produced through the above step, to thereby form the first RE-containing alloy, wherein the solidification step is performed at a cooling rate of 102 to 104° C. / second, as measured at least within a range of the temperature of the molten metal to 900° C.; and an RE-containing alloy, which is represented by a compositional formula of RrTtAa (wherein R and A represent the same meaning as above, T represents Fe, etc.; 5.0 at. %≦r≦6.8 at. %, 73.8 at. %≦t≦88.7 at. %, and 4.6 at. %≦a≦19.4 at. %) and has an alloy microstructure containing an NaZn13-type crystal structure in an amount of at least 85 mass % and α-Fe in an amount of 5-15 mass % inclusive.

A membrane actuator includes a magnetically actuatable membrane and a magnetic trigger. The membrane includes a shape memory alloy (SMA), and the magnetic trigger is configured to induce a martensitic transformation in the SMA, to produce a larger force than would be achievable with non-SMA-based materials. Such a membrane actuator can be beneficially incorporated into a wide variety of devices, including fluid pumps, shock absorbing systems, and synthetic jet producing devices for use in an aircraft. The membrane / diaphragm can be formed from a ferromagnetic SMA, or a ferromagnetic material can be coupled with an SMA such that the SMA and the ferromagnetic material move together. A hybrid magnetic trigger, including a permanent magnet and an electromagnet, is preferably used for the magnetic trigger, as hybrid magnetic triggers are easy to control, and produce larger magnetic gradients than permanent magnets or electromagnets alone.

A bonded magnetostrictive composite material and a process for preparation belong to the technical field of magnetic functional materials and preparation, which is characterized by being formed by magnetostrictive sheets with 1-15mm thickness through bonding, wherein the major components of the magnetostrictive sheet is (Tb, Dy) Fe2 rare-earth giant magnetostrictive materials, FeGa and NiMnGa magnetostrictive composite materials. The bonded magnetostrictive composite material has excellent eddy resistance performance, and increases over 30-80% magnetostrictive property under high frequency compared with common mangetostrictive composite materials. In addition, the process for preparation has simple operation and low cost, and has regular product appearance and large freedom degree in dimension, and overcomes the disadvantage that the traditional unidirectional solidification technique hardly obtains magnetostrictive composite material in large dimension.

A perforating gun includes a charge tube having shaped charges affixed thereto. Each shaped charge includes a radially outward pointing post adapted to receive a detonator cord. A retention member installed on the post provides a compressive force that energetically couples the detonator cord to the post. The radially outermost portion of the retention member is radially flush with or radially recessed relative to the radially outermost portion of each post. In one embodiment, the retention member has a rounded medial portion, a central opening and a pair of locking tabs that point radially inward to the central opening. Each post may include a slot for receiving the detonator cord and a circumferential groove that is adapted to receive the locking tabs.

The invention provides a magnetostrictive material and a preparation method thereof. The composition of the magnetostrictive material is (Fe[]1-x]Gax)[100-y]REy, wherein 0.17<=x<=0.19, 0.01<=y<=0.2, and RE is selected from one or more of Tb, La, Sm, Dy, Lu, Ho, Er and Tm. The preparation method comprises the following steps: smelting the Fe Ga and RE prepared according to the composition requirements into a mother alloy cast ingot, preparing a mother alloy bar, putting the mother alloy bar and a <100>-oriented FeGa monocrystal seed in a directional solidification apparatus, vacuumizing the directional solidification apparatus, charging protective gas, heating to melt all the mother alloy bar and melt the upper part of the FeGa monocrystal seed, and drawing the molten material into a coolant along the lower part of the FeGa monocrystal seed to carry out directional solidification, wherein the temperature gradient is controlled at 1*10<5>-9*10<5> K / m, and the growth rate is 1000-20000 mm / hour. The magnetostrictive material prepared by the method is a <100>-oriented monocrystal material in which the RE elements are completely dissolved in the FeGa matrix; the saturated magnetic field is only 100-5000e, and the magnetostriction coefficient is up to 300-1500 ppm; and the magnetostrictive material has favorable comprehensive usability and wide application prospects.