A kind of cobalt-iron-based nitrogen-containing alloy magnetostrictive material and preparation method thereof
A technology of magnetostrictive materials and nitrogen alloys, which is applied in the direction of material selection for magnetostrictive devices, metal material coating technology, device material selection, etc., can solve the problems of strong hysteresis loss, large coercivity, and affecting Performance and other issues, to achieve good acid corrosion resistance, good corrosion resistance, simple preparation process effect
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Embodiment 1
[0027] Embodiment 1: Preparation of cobalt-iron-based nitrogen-containing alloy magnetostrictive material
[0028] (1) According to the cobalt:iron molar ratio of 1:2, weigh divalent cobalt salt and ferric salt samples into a beaker, add distilled water, stir magnetically at 60°C to dissolve completely, and then add citric acid and ethylene glycol, then add ammonia water dropwise to adjust the pH value to 7, then mechanically stir the sample in a water bath at 80°C until the sample becomes gelatinous, put the sample into an oven to fume at 200°C, take it out and put it in a muffle furnace at 800°C , sintered at high temperature for 4 hours to obtain cobalt iron oxide in good crystallization state;
[0029] (2) Cobalt ferrite prepared in step (1) in H 2 / N 2 Atmosphere (4% N 2 +96%H 2 ,500sccm atmosphere), reduction at 800°C for 4h to obtain a single-phase cobalt-iron alloy;
[0030] (3) Divide the single-phase cobalt-iron alloy prepared in step (2) into 8 parts, seven of ...
Embodiment 2
[0031] Example 2, verification of cobalt-iron-based nitrogen-containing alloy magnetostrictive material
[0032] 1. Verify the purity of intermediate cobalt-ferrite and cobalt-iron alloys
[0033] Cobalt iron oxide (CoFe2) after high temperature sintering prepared by X-ray diffractometer (XRD; DX-2000SSC) test embodiment 1 2 o 4 ) and the cobalt-iron alloy (CF) obtained after hydrogen reduction, the corresponding X-ray diffraction patterns, see figure 1 .
[0034] Depend on figure 1 The position and relative intensity of each diffraction peak in the standard PDF card (CoFe 2 o 4 (No.221086), CoFe (No.491568)) comparison shows that what the present invention experiment makes is pure cobalt iron oxide and cobalt iron alloy.
[0035] 2. Determine the cobalt-iron-based nitrogen-containing alloy magnetostrictive material
[0036] With X-ray diffractometer (XRD; DX-2000SSC) test the cobalt-iron alloy that embodiment 1 prepares in NH 3 The sample after medium series temperature...
Embodiment 3
[0039] Embodiment 3: Corrosion experiment and magnetostriction coefficient test of cobalt-iron-based nitrogen-containing alloy magnetostrictive material
[0040] 1. Corrosion test
[0041] After the cobalt-iron alloy (CF) and CFN1000 samples in Example 1 were pressed into discs, they were calcined at 1000°C for 4 hours under a nitrogen atmosphere, and then the surface and sides of the calcined discs were smoothed with sandpaper, and corrosion tests were carried out.
[0042] Cobalt iron alloy (CF), CFN in 0.1M H 2 SO 4 Soak in the solution for 24h. During the immersion process, the cobalt-iron alloy (CF) was completely corroded and dissolved after immersion for 20 h; the scanning electron micrographs (SEM) of CFN samples without any corrosion and CFN samples corroded in sulfuric acid solution for 24 h, see Figure 4 .
[0043] Depend on Figure 4 It can be seen that compared with CF, the CFN sample has a good corrosion resistance to acid.
[0044] 2. Magnetostriction coe...
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