Rare earth metal base permanent magnet and its producing process
A technology of rare earth metals and permanent magnets, applied in the manufacture of permanent magnets, magnetic objects, permanent magnets, etc., can solve problems such as complex production processes, and achieve the effect of improving dimensional accuracy and excellent corrosion resistance
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Examples
Embodiment 1
[0110] (Process A)
[0111] 2% (weight) epoxy resin is added in the alloy powder that is made by rapid solidification process, and the average particle size of alloy powder is 150 μ m, and composition is 12% (atom) neodymium, 77% (atom) iron, 6% (atom) ) boron and 5% (atomic) cobalt, and the mixture was stirred. The resulting material is at 686N / mm 2 Compression molding was performed under pressure, followed by curing at 170° C. for 1 hour, thereby producing a ring-shaped bonded magnet having an outer diameter of 22 mm, an inner diameter of 20 mm, and a height of 3 mm. Table 1 shows the properties of the annular bonded magnet (blank).
[0112] (Process B)
[0113] 50 magnets (apparent volume of 0.15 liters and weight of 71 g) and 10 kg of short columnar magnets (made by wire cutting) (apparent volume of 2 liters) with a diameter of 1 mm and a length of 1 mm (made by wire cutting) obtained in process A Fine copper powder production materials are put into the processing cont...
Embodiment 2
[0117] The magnet obtained in Example 1 and having a thin film layer composed of fine copper powder on the entire surface thereof was cleaned, followed by a hanger-type nickel plating treatment. The composition of the electroplating solution is: 240g / L nickel sulfate, 45g / L nickel chloride, an appropriate amount of nickel carbonate (to make the pH value suitable) and 30g / L boric acid. The electroplating condition is that the current density of electroplating is 2A / dm 2 , the electroplating time is 60 minutes, the pH value of the electroplating solution is 4.2, and the temperature is 55°C. The thickness of the formed plating film was 22 μm on the outer diameter side and 20 μm on the inner diameter side.
[0118] An environmental test (humidity resistance test) is carried out on the coated magnet, the test time is 500 hours, the condition is that the test temperature is 80°C and the relative humidity is 90%. Observe the surface morphology of the magnets that have passed the moi...
Embodiment 3
[0122] (Process A)
[0123] 2% (weight) epoxy resin is added in the alloy powder that is made by rapid solidification process, and the average particle size of alloy powder is 150 μ m, and composition is 13% (atom) neodymium, 76% (atom) iron, 6% (atom) ) boron and 5% (atomic) cobalt, and the mixture was stirred. The resulting material is at 686N / mm 2 Compression molding was performed under pressure and then cured at 180° C. for 2 hours, thereby producing a ring-shaped bonded magnet having an outer diameter of 21 mm, an inner diameter of 18 mm, and a height of 4 mm. Table 1 shows the properties of the annular bonded magnet (blank).
[0124] (Process B)
[0125] 50 magnets (apparent volume of 0.15 liters and weight of 132 g) produced in process A and a short column with a diameter of 1 mm and a length of 0.8 mm (made by wire cutting) (apparent volume of 2 liters) Fine iron powder production materials are put into the processing container of a vibrating grinder with a volume ...
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