Production method for rare earth alloy magnetic powder forming body and rare-earth magnet
A technology of rare earth alloys and manufacturing methods, which is applied in the manufacture of rare earth magnets and the manufacture of rare earth alloy magnetic powder compacts. It can solve the problems of poor corrosion resistance test results, poor HAST tests, and increased frictional resistance, so as to prevent oxidation. , the degree of orientation increases, the effect of improving the degree of orientation
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[0034] Example 1
[0035] The present invention takes NdFeB series rare earth alloy magnetic powder as an example to illustrate the magnetic field forming process of the rare earth alloy magnetic powder.
[0036] The production process mainly includes the following processes: raw material preparation→smelting→casting→hydrogen crushing and pulverization→fine pulverization→forming in a magnetic field→sintering→heat treatment→magnetic performance evaluation→evaluation of oxygen content in the sintered body.
[0037] In the raw material preparation process: prepare 99.5% pure Nd, industrial Fe-B, industrial pure Fe, and 99.9% Co. The weight ratio of each component is as shown in Table 1:
[0038] Table 1 The weight ratio of each component
[0039]
[0040] In order to complete the above-mentioned preparation composition, a total of 500Kg of raw materials were weighed and prepared.
[0041] In the smelting process: the prepared raw materials are placed in a crucible made of alumina, and a hig...
Example Embodiment
[0057] Example 2
[0058] The differences between Example 2 and Example 1 are listed as follows:
[0059] 1) Add methyl octanoate used as an organic additive to the pulverized powder in an amount of 0.01% by weight of the rare earth alloy magnetic powder, and mix it thoroughly with a V-type mixer.
[0060] 2) Forming process in a magnetic field: Divide the powder into 10 equal parts, and use a right-angle oriented magnetic field forming machine for each part. In an orientation magnetic field of 1.8T, at 0.8ton / cm 2 Under the molding pressure of, a cube with a side length of 25mm was formed, which was demagnetized in a 0.2T magnetic field after molding.
[0061] When forming, use argon atmosphere. The oxygen content in the argon atmosphere is fixed below 1000ppm. Humidifier and cooling equipment are installed in the forming machine. The temperature of the atmosphere varies from 10℃ to 55℃ and the relative humidity varies from 5 to 45%. In the atmosphere of forming.
[0062] Table 3 is a...
Example Embodiment
[0065] Example 3
[0066] The differences between Example 3 and Example 1 are listed as follows:
[0067] 1) Add methyl octoate to the pulverized powder in an amount of 1.5% of the weight of the rare earth alloy magnetic powder, and then mix it thoroughly with a V-type mixer.
[0068] 2) Forming process in a magnetic field: Divide the powder into 10 equal parts, and use a right-angle oriented magnetic field forming machine for each part. In an orientation magnetic field of 1.8T, at 0.3ton / cm 2 Under the molding pressure of, a cube with a side length of 25mm was formed, which was demagnetized in a 0.2T magnetic field after molding.
[0069] When forming, use argon atmosphere. The oxygen content in the argon atmosphere is fixed below 1000ppm. Humidifier and cooling equipment are installed in the forming machine. The temperature of the atmosphere varies from 10℃ to 55℃ and the relative humidity varies from 5 to 45%. In the atmosphere of forming.
[0070] Table 4 is a comparison table of t...
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