Process for producing iron-phosphorus amorphous powder by electric brush plating method

Abstract

Components of nickel-iron-phosphorus amorphous alloy powder are 40wt% to 90wt% of nickel, 5wt% to 35wt% of iron and 5wt% to 25wt% of phosphorus; the powder has an amorphous structure. A production method is characterized by comprising the following steps of (1), rust removal and degreasing treatment of the to-be-plated surface of a substrate, wherein the elongation of the metal substrate at normaltemperature is not less than 10 percent; (2), preparation of a nickel-iron-phosphorus amorphous alloy plated layer: preparing the nickel-iron-phosphorus amorphous alloy plated layer by adopting an electric brush plating method, wherein a graphite plate or a stainless steel plate is adopted as an anode; the current densities of electrodes are 0.5A / mm<2> to 5A / mm<2> (preferably 1.5A / mm<2> to 3A / mm<2>); the speed of the relative motion of the electrodes is 5m / min to 20m / min (preferably 10m / min to 15m / min); a hydrochloric acid or sulfuric acid solution is titrated to enable the Ph (Potential of hydrogen) value of plating liquid to be less than 3; a plating temperature is 40 to 85 DEG C; (3), enabling the amorphous alloy plated layer to fall by utilizing the difference of the plastic deformation capacity of the substrate and the amorphous plated layer and adopting methods of rolling, bending, shot blasting and the like; (4), crushing the fallen amorphous alloy plated layer by adopting theways of a ball mill, a grain crusher and the like, wherein the ball mill and the grain crusher are expected to adopt a forced cooling way or a clearance working way. A process is simple, and the operability is high.

Description

technical field [0001] The invention relates to a method for producing iron-based alloy amorphous powder, in particular to a process for producing iron-phosphorus amorphous powder by an electric brush plating method. Background technique [0002] With the development of electronic power and communication industry, electronic components are developing in the direction of miniaturization, high frequency and high current. [0003] development, and the requirements for the electromagnetic compatibility performance of electronic equipment are getting higher and higher. The traditional amorphous strip iron core, soft ferrite [0004] And metal magnetic powder cores can no longer meet the demand. The performance defects of ordinary magnetic materials are mainly manifested in: (1) The eddy current induced by the amorphous strip iron core causes a large loss during high frequency operation, which limits its application in the high frequency field; (2) The soft magnetic ferrite has l...

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Problems solved by technology

However, in the process of water atomization, the obtained powder is easy to form oxides and has a high oxygen content. Furthermore, when the molten metal solidifies, the generated water vapor will cover the surface of the molten metal. The existence of this water vapor film will lead to The cooling strength of the molten core metal is reduced, so that the central part of the powder cannot obtain an amorphous structure, which affects device performance

Due to the limited cooling intensity, the aerosol method can only prepare amorphous alloy powder with strong amorphous forming ability, and the production cost is high

The advantage of the direct crushing method is that the selectivity to the material is not strong, and the material utilization rate is high, but the embrittlement annealing of the amorphous thin strip is required, and it is easy to cause uneven crystallization transformation inside the thin strip due to uneven annealing, and in the After crushing, it is easy to produce powder particles with sharp angles, which brings difficulties to the subsequent processing of powder