54results about How to "High magnetostriction coefficient" patented technology

The invention discloses a large-amorphous forming capacity iron-based block amorphous magnetic alloy material and a preparation method thereof. The molecular formula of the large-amorphous forming capacity iron-based block amorphous magnetic alloy material is (Fe0.75-aMaB0.25-bSib) 1-cNbc, wherein M is one or more elements of Dy, Tb, Sm, Er, Ga and Y, a, b and c are atom percentages, a is not less than 0.005 and not greater than 0.1, b is not less than 0.03 and not greater than 0.07, and c is not less than 0.02 and not greater than 0.06. Compared with the prior art, the alloy material in the invention has the advantages of large amorphous forming capacity, favorable magnetostrictive coefficient and excellent soft magnetic performance, the reduced glass transition temperature of the alloy material reaches 0.5-0.7, the magnetostrictive coefficient reaches -50*10<-6> to 200*10<-6>, the alloy material can be prepared into amorphous bars with the diameters of 0.5mm-6mm due to the large amorphous forming capacity, thereby the alloy material can be widely applied in the fields of transformers, magnetic sensors and the like.

The invention relates to a giant magnetostrictive rotary ultrasonic vibration knife handle and belongs to the technical field of ultrasonic precise special machining. The knife handle comprises an amplitude-change pole, a giant magnetostrictive ultrasonic transducer, a hollow knife handle body, an auxiliary side component, a primary side component and a threaded pressing block, wherein the giant magnetostrictive ultrasonic transducer is connected with the amplitude-change pole through a threaded rod and installed in a cavity in the lower portion of the knife handle body; an ultrasonic vibrator formed by connecting the giant magnetostrictive ultrasonic transducer with the amplitude-change pole makes contact with the inner wall of the knife handle body, the lower end of the giant magnetostrictive ultrasonic transducer is tightly pressed onto the knife handle body through the threaded pressing block, and the threaded pressing block is connected with the knife handle body through threads; the lower end of the amplitude-change pole is tightly pressed through the threaded pressing block, and the threaded pressing block is connected with the knife handle body; the lower end of the auxiliary side component is fixed to the knife handle body through a screw, and the primary side component is fixed to the end face of a machine tool spindle. According to the giant magnetostrictive rotary ultrasonic vibration knife handle, the problem of heating of the transducer is effectively solved by means of a giant magnetostrictive material of a slice structure and an air cooling system. By the adoption of the knife handle, the machining efficiency can be improved. In addition, the knife handle can be suitable for any knife handle connection standards.

The invention discloses a high magnetostrictive Fe-based metal glass magnetic material and a preparation method thereof. The chemical formula of the high magnetostrictive Fe-based metal glass alloy is Fe100-x-y-zMozByTbx, wherein, x, y and z are respectively the atomic percents of Tb, B and Mo, 100-x-y-z is the atomic percent of Fe, x is more than 0 and less than or equal to 10, y is more than orequal to 20 and less than or equal to 25, z is more than 0 and less than or equal to 10. The preparation method of the alloy is as follows: the industrial pure metals Fe, Mo, Tb and FeB alloy are proportioned according to the alloy formula and melted repeatedly by induction-arc under the protection of argon to make master alloy, then the high magnetostrictive Fe-based metal glass magnetic material is obtained through casting by using the copper mold spray-casting method. The magnetostrictive coefficient of the magnetic material is 420 ppm to 985 ppm, and the magnetic material has simple components, high thermal stability, and good mechanical properties and amorphous forming ability. The high magnetostrictive Fe-based metal glass magnetic material can be widely applied to the fields of sonar transducer, sensor, ultrasonic technology, communication technology, and the like.

The invention discloses a method for preparing an iron-based magnetostrictive coating by using a thermal spraying technology, which belongs to the field of magnetic materials. The iron-based magnetostrictive material is firstly prepared into spherical gas-atomized powder, and then the metal material is used as the substrate, and the spherical gas-atomized powder is sprayed onto the metal substrate by plasma spraying to prepare the iron-based magnetostrictive coating. The specific steps are to first melt the iron-based magnetostrictive material into an ingot in a vacuum melting furnace, remove the scale on the surface by machining, and then send the ingot to a high-pressure atomization powder making device, and melt the ingot through a high-speed argon gas flow. The alloy stream breaks up into small droplets and condenses into powder. Thermal spraying technology adopts plasma spraying. The plasma gas is mainly nitrogen, supplemented by hydrogen. The iron-based magnetostrictive gas atomized powder is sent into the plasma chamber, and the coating is formed by heating, melting, flying, impacting the substrate, cooling and solidification. Its advantages are: high bonding strength of the coating, fine structure, low porosity, and the addition of alloying elements reduces oxide slag inclusions.