Low-coercivity iron-based nanocrystalline alloy and preparation method thereof
A technology of iron-based nanocrystals and low coercive force, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems that have not been widely used, Zr elements are easy to oxidize, cannot be prepared, etc., and achieve high saturation magnetic induction , stable annealing performance, and enhanced saturation magnetic induction
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Embodiment 1
[0034] In this embodiment, the molecular formula of the alloy is Fe 77 Cu 0.5 Nb 2.5 Si 11 B 9 , the preparation steps are as follows:
[0035] Step 1. Prepare 30 g of raw materials Fe, Si, B, Cu, and Nb with a purity greater than 99.9% according to the molecular formula of this embodiment, wherein B is added in the form of an iron-boron alloy, and the mass percentage of B in the iron-boron alloy is 28.85%;
[0036] Step 2, adopting an induction melting furnace to smelt the raw materials configured in step (1) under the protection of an argon atmosphere, and after repeated smelting for many times, obtain a master alloy ingot by cooling, wherein each smelting is performed with a slag removal operation, In order to obtain a higher purity master alloy ingot;
[0037] Step 3. Break the mother alloy ingot into small samples, put them into a quartz tube with a nozzle at the bottom, quickly smelt the small alloy ingots to a molten state through an induction coil, and prepare amo...
Embodiment 2
[0047] In this embodiment, the molecular formula of the alloy is Fe 76.7 Co 0.3 Cu 0.5 Nb 2.5 Si 11 B 9 , the preparation steps are as follows:
[0048] The ratio of the nanocrystalline alloy is as follows: the raw materials Fe, Si, B, Cu, Nb and Mo with a purity greater than 99.9% are prepared according to the molecular formula of this embodiment to 30g, wherein B is added in the form of an iron-boron alloy, and B in the iron-boron alloy is added. The mass percentage of 28.85%;
[0049] Other preparation processes of the alloy strips are the same as in Example 1;
[0050] The processing steps of the nanocrystalline alloy are changed to: the amorphous alloy strip is loaded into a longitudinal magnetic field heat treatment furnace, and after crystallization annealing in a nitrogen atmosphere, it is cooled to room temperature to obtain an iron-based nanocrystalline alloy, wherein the crystallization annealing temperature It is 770K, the holding time is 5-60min, the coolin...
Embodiment 3
[0057] In this embodiment, the molecular formula of the alloy is Fe 76.4 Co 0.6 Cu 0.5 Nb 2.5 Si 11 B 9 , the preparation steps are as follows:
[0058] The preparation process of the alloy strip is the same as that in Example 2;
[0059] The processing steps of the nanocrystalline alloy are changed to: the amorphous alloy strip is loaded into a longitudinal magnetic field heat treatment furnace, and after crystallization annealing in a nitrogen atmosphere, it is cooled to room temperature to obtain an iron-based nanocrystalline alloy, wherein the crystallization annealing temperature It is 757K, the holding time is 5-60min, the cooling method is water quenching, and the magnetic field strength of the longitudinal magnetic field annealing is 500-1000Gs.
[0060] The structure of the alloy strips prepared in step 3 was tested with a Bruker D8ADVANCE polycrystalline X-ray diffractometer, and the results are as follows figure 1 As shown, it can be seen that the XRD pattern...
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Abstract
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