Nickel-iron based nitrogen-containing alloy magnetostrictive material and preparation method thereof
A technology of magnetostrictive materials and nickel-iron alloys, which is applied in the direction of material selection for magnetostrictive devices, metal material coating process, device material selection, etc., can solve the problem that pure alloy materials are easily oxidized and corroded, affecting device performance. and other problems, to achieve the effect of good corrosion resistance, simple preparation process and high resistivity
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Embodiment 1
[0028] Example 1: Preparation of Ni-Fe-based Nitrogen-Containing Alloy Magnetostrictive Material
[0029] (1) First, according to the molar ratio of nickel:iron of 1:2, weigh nickel nitrate and ferric nitrate, put the weighed sample into a beaker, add distilled water, stir it magnetically at 60°C to completely dissolve it, and then add lemon acid and ethylene glycol, and then add ammonia water dropwise to adjust the pH value to make pH=7; then mechanically stir the sample in a water bath at 80°C until the sample becomes gel-like, put the sample into an oven to emit smoke at 200°C, take out the sample and put it in a muffle In a furnace at 800° C. and high temperature sintering for 4 hours, nickel-iron-oxide (NiFO) with good crystallinity was obtained.
[0030] (2) put the prepared nickel ferrite in H 2 / N 2 (4%N 2 +96%H 2 , 500sccm) atmosphere, reduction at 800 ℃ for 4h to obtain a single-phase nickel-iron alloy (NiFe).
[0031] (3) Divide the prepared nickel-iron alloy i...
Embodiment 2
[0032] Example 2: Verification of Ni-Fe-based Nitrogen-Containing Alloy Magnetostrictive Materials
[0033] 1. Verify the purity of the intermediate products NiFeO and NiFe alloys
[0034] The nickel ferrite (NiFe) after high temperature sintering prepared in Example 1 was tested by X-ray diffractometer (XRD; DX-2000SSC). 2 O 4 ) and H2 / N 2 The nickel-iron alloy (NF) obtained after mixed atmosphere reduction, the corresponding X-ray diffraction pattern, see figure 1 .
[0035] Depend on figure 1 The position and relative intensity of each diffraction peak in the standard PDF card (NiFe 2 o 4 (No.74-2081), NiFe 2 (No.38-0419)) compared as known, what the present invention experiment makes is pure nickel-iron-oxygen and nickel-iron alloy.
[0036] 2. Confirm the nickel-iron-based nitrogen-containing alloy magnetostrictive material
[0037] With X-ray diffractometer (XRD; DX-2000SSC) test the nickel-iron alloy that embodiment 1 prepares in NH 3 The sample after medium ...
Embodiment 3
[0040] Embodiment 3: Corrosion experiment and magnetostrictive coefficient test of nickel-iron-based nitrogen-containing alloy magnetostrictive material
[0041] 1. Corrosion test
[0042] After the nickel-iron alloy (NF) and NFN samples in Example 1 were pressed into discs, they were calcined at 1000° C. for 4 hours under the protection of nitrogen atmosphere, and then the surface and sides of the calcined discs were smoothed with sandpaper, and the corrosion test was carried out.
[0043] Put nickel-iron alloy NF and NFN at 0.1MH 2 SO 4 solution, 0.1M NaOH solution, and 3.5%wt Nacl solution for 24 hours. Scanning electron micrographs (SEM) of NF and NFN samples without any corrosion and NF and NFN samples corroded in acid, alkali, and salt solutions for 24 h are shown in Figure 4. It can be seen from Figure 4 that compared with NF, NFN samples have good corrosion resistance to acids, alkalis, and salts.
[0044] 2. Magnetostriction coefficient test
[0045] The magnetos...
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