Casting and melt-spinning process of ferrozirconium casting piece

Abstract

The invention discloses a casting melt-spinning process of a ferrozirconium cast sheet, which comprises the following steps: step 1, preparing raw materials according to the following component proportion in parts by weight: 58-60 parts of Zr, 2-4 parts of Hf and 38-40 parts of Fe; 2, the prepared raw materials are mixed and put into a smelting and casting furnace, and air in the smelting and casting furnace is pumped out to reach a vacuum state; step 3, filling inert protective gas into the smelting casting sheet furnace, heating and smelting the mixed raw materials under the protective atmosphere of the inert protective gas, and preserving heat of the smelted raw materials at the temperature of 1600-1700 DEG C for 5 minutes; and fourthly, the molten raw materials subjected to heat preservation are output from a sprue of the smelting casting piece furnace and fall onto a rotating casting roller, then casting pieces are obtained through melt-spinning, the output speed of the raw materials in the sprue is 1.00-1.30 kg / s, and the rotating speed of the casting roller is 60-65 rpm. The method has the advantages that the thickness of the prepared ferrozirconium cast sheet meets the requirement, the distribution is uniform, the metallographic structure is clear, and the grain size is uniform.

Description

technical field [0001] The invention relates to the technical field of cast slab production, in particular to a casting strip casting technology of zirconium iron cast slab. Background technique [0002] In the production process of NdFeB castings, it is necessary to add 0.1% to 0.2% of trace elements to refine the grains. At present, the trace elements added are generally niobium (Nb). The latest research has found that replacing niobium with zirconium (Zr) can be more If the number of grains is well refined, the performance is more excellent. During the casting process of NdFeB slabs, the grains are not easy to grow. However, the melting point of pure zirconium is 1852 ° C. Direct participation in the production of NdFeB slabs will bring Excessive power consumption and uncontrollability, zirconium-iron alloys have uniformity problems, and are not suitable for the production of NdFeB slabs, and zirconium-iron slabs in the form of solid solutions participate in the productio...

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Problems solved by technology

[0002] During the production process of NdFeB cast slabs, 0.1%~0.2% of trace elements need to be added to refine the grains. At present, the trace elements added are generally niobium (Nb) , the latest research found that replacing niobium with zirconium (Zr) can better refine the number of grains, and the performance is more excellent. During the casting process of NdFeB castings, the grains are not easy to grow, but the melting point of pure zirconium At 1852°C, directly participating in the production of NdFeB cast slabs will cause excessive power consumption and uncontrollability, and Zirconium-iron alloys have uniformity problems, and are not suitable for the production of NdFeB cast slabs, but in the form of solid solution The existing ferro-zirconium slabs participate in the production of NdFeB slabs, which can effectively reduce the melting point and improve stability and uniformity

[0003] There are still many unsolved difficulties in the production of ferro-zirconium slabs. For example, referring to the belt-slinging process of NdFeB slabs, the molten raw materials are output to the rotary On the copper roller, the molten raw material is instantly condensed into a cast sheet through the throwing belt of the copper roller. When it is applied to the iron-zirconium cast sheet, the fluidity of the mixed molten raw material of the zirconium-iron cast sheet is not as good as that of the NdFeB cast sheet. Mixing molten raw materials, there are difficulties in the processing of raw materials, the casting speed of molten raw materials, the casting method and the control of the rotation speed of copper rollers. For example, if the copper rollers rotate too slowly, the molten raw materials will be cut off or directly solidified on the copper rollers. If the copper roller rotates too fast, the thickness requirement of the casting sheet cannot be met; for example, if the casting speed of the molten raw material is too slow, the casting sheet will be lumpy, thick, and the metallographic structure is disordered, and the casting speed will be too fast, which will cause the molten raw material to fail. It is difficult to separate these situations when they are condensed in time or the cast pieces are connected together after being thrown off. Therefore, how to coordinate many factors to manufacture iron-zirconium cast pieces that meet the requirements is a major problem in the production of iron-zirconium cast pieces.

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