Preparation method for iron-nickel-molybdenum soft magnetic alloy sheet

Abstract

The invention discloses a preparation method for an iron-nickel-molybdenum soft magnetic alloy sheet. Iron and molybdenum are molten in a vacuum induction smelting furnace first according to the mass ratio of 1:1-1.2, and molybdenum-iron intermediate alloy blocks are formed through pouring; then according to a mass ratio, 2%-8% of molybdenum-iron intermediate alloy blocks, 75%-85% of nickel, 0.05%-0.4% of phosphorus, 0.1%-0.45% of sulfur and smelting pure iron with the residual mass percent are molten in the induction smelting furnace, when the temperature of a molten alloy melt is increased to 1530-1580 DEG C, the alloy sheet is formed through quick solidification pouring, the sheet is soaked into water to be cooled and is then subjected to drying treatment, and the alloy sheet uniform in thickness, free of agglomeration and little in oxidation is obtained. Through the preparation method, the problem of large burning loss of precious metal molybdenum during smelting of iron-nickel-molybdenum alloy can be solved, the prepared alloy sheet can be directly used for a powder making procedure, alloy powder is obtained through ball milling, the technological process is simplified, production cost is reduced, meanwhile, the condition of alloy oxidation during production is reduced, and product performance is improved.

Description

technical field [0001] The invention relates to a method for preparing iron-nickel-molybdenum soft magnetic alloy flakes, belonging to the technical field of alloy material smelting and application. Background technique [0002] With the continuous development of the electronics industry, the requirements for magnetic materials are getting higher and higher. Metal soft magnetic alloy powder core is a soft magnetic material manufactured by powder metallurgy, which has advantages that other magnetic materials cannot match in many applications. Among all metal soft magnetic powder cores, iron-nickel-molybdenum soft magnetic alloy powder core has the advantages of the lowest loss, the highest Q value, good stability, wide frequency range, and no noise when working at different frequencies. However, the preparation technology of iron-nickel-molybdenum alloy powder materials is difficult and the process threshold is high. [0003] At present, the methods of preparing iron-nickel-...

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Problems solved by technology

The process of preparing iron-nickel-molybdenum soft magnetic alloy powder by mechanical alloying is simple, but the cycle is long, energy consumption is large, easy to oxidize, and performance is reduced

The atomization method is divided into gas atomization and water atomization. The gas atomization method produces spherical powder with high purity, but poor formability, difficult to suppress, and expensive; the water atomization method produces irregular powder with high oxygen content and impurities. Many, high powder core loss, poor performance

The hot-rolling and crushing method uses alloy smelting to cast ingots, first through high-temperature and large-reduction hot-rolled ingots into blocks, and then crushing and powdering. Due to the use of non-vacuum smelting, the precious metal molybdenum is directly added during the smelting process, resulting in The loss of metal molybdenum is large, about 8%, resulting in great waste

At the same time, the process flow of this kind of production process is long, the loss of materials and energy is large, and the oxidation of the alloy is serious; The appearance is not good; although the powder prepared by the large-reduction hot rolling equipment has good formability and good performance, it is expensive, which leads to high overall cost, long process and large equipment investment for the alloy powder produced by the hot rolling crushing method

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