Huge magnetostriction material and mfg. process thereof

A technology of giant magnetostriction and manufacturing process, applied in the field of metal materials, can solve problems such as high price, achieve the effects of small investment, low manufacturing cost, and good low-field performance

Inactive Publication Date: 2003-08-13
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] The above-mentioned patents mainly involve the composition of the alloy, and the m...

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Embodiment Construction

[0040] 1. The composition is (Tb 0.3 Dy 0.7 )(Fe 0.92 be 0.08 ) 1.95 Alloys, using the above raw materials, vacuum induction furnace, Al 2 o 3 Smelted in a crucible and cast into master alloy rods of Φ10mm×150mm. Oriented crystallized rods with axial orientation were obtained by pulling method. The material was treated in a vacuum furnace at 1120°C for 2 hours, air-cooled to 450°C, placed in a magnetic field to cool to room temperature, the magnetic field strength was 80KA / m, and the magnetic field was perpendicular to the sample. After polishing, measure the magnetostrictive strain with a resistance strain gauge and the standard four-contact method, and its performance can reach:

[0041] ① Magnetostrictive strain λ ∥ , see Table 2

[0042] Measuring magnetic field (kA / m)

Precompression stress (MPa)

lambda ∥ (ppm)

40.0

5.0

1050

80.0

5.0

1300

[0043] ②Tc=365℃

[0044] ③...

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Abstract

A giant-magnetostrictive material is (Tb1-x-yDyxRy)(Fe1-z-pBe2Mp)g, where R is chosen from Ho, Er, Pr and Nd, M is chosen from Ti, V, Cr, Co, Ni, Mn, Si, Ga and Al, x=0.65-0.80, y=0-0.15, and g=1.75-2.55. Its preparing process includes smelting mother alloy in Ar atmosphere in vacuum furnace, growing oriented crystallizing material in vacuum or inert gas, and heat treating in vacuum furnace. Its advantages are high magnetostrictive strain ratio, good low-field performance, and low cost.

Description

Technical field: [0001] The invention belongs to the field of metal materials, and in particular relates to a giant magnetostrictive material mainly with <113> axial orientation and a manufacturing process thereof. Background technique: [0002] When the magnetization state of a ferromagnetic material changes, its shape and size will change. This phenomenon is called magnetostriction. In the early 1950s, it was discovered that the magnetostrictive strain λ of Ni and Ni-Fe-Co alloys S Can reach 50PPm (1PPm=10 -6 ). People once wanted to use Ni alloy to make magnetostrictive devices. However, because their hysteresis strain is too small, they have not been popularized and applied. Later, people discovered a material with electrostrictive properties, called piezoelectric ceramic material. Among them, the piezoelectric ceramic material with the grade PZT--4 has a stretching strain of 250-400PPm under the action of an electric field. Since then, people have gradually ...

Claims

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Application Information

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IPC IPC(8): H01F1/04H01L41/20
Inventor 张茂才高学绪周寿增史振华王润
Owner UNIV OF SCI & TECH BEIJING
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