Iron base rare earth alloy powder and compound comprising iron base rare earth alloy powder, and permanent magnet using the same
A technology of alloy powder and rare earth, which is applied in the field of iron-based rare earth alloy powder and its manufacture, and can solve problems such as high viscosity, difficulty in manufacturing magnetic powder, and difficulty in manufacturing fine particles
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Embodiment 1
[0177] This example is used to describe the production example of the ferrous-based rare earth alloy powder (non-titanium system) of the present invention.
[0178] For each example of No. 1 to No. 5, Fe, Co, B, Nd, and Pr with a purity of 99.5% or higher were weighed in a total amount of 100 g, and put into a quartz crucible. Table 1 shows the composition of each Example No. 1 to No. 5. Since the bottom of the quartz crucible has a small hole with a diameter of 0.8mm, after the above-mentioned raw materials are melted in the quartz crucible, they become a molten alloy and are ejected downward from the small hole. The raw materials were melted by high-frequency heating under an argon atmosphere with a pressure of 2 kPa. In this embodiment, the melting temperature was set at 1,350°C.
[0179]A pressure of 32 kPa was applied to the liquid surface of the molten alloy, and the melt was ejected in a direction facing the outer peripheral surface of the copper roller located 0.8 mm ...
Embodiment 2
[0193] This embodiment is an illustrative example of forming a bonded magnet by injection molding.
[0194] First, ferrous-based rare earth alloy powder (non-titanium series) is prepared in the following manner.
[0195] Will fit to have Nd 4.5 Fe 73.0 B 18.5 co 2 Cr 2 The raw material alloy of the alloy composition was melted by high frequency, and the obtained molten alloy was fed through a chute at a speed of 5 kg / min onto the surface of a copper roll rotating at a peripheral speed of the roll surface of 8 m / s. A quenched alloy ribbon with a thickness of 120 μm was obtained. The structure of this quenched alloy is F 23 B 6 A structure in which phases and amorphous phases are mixed.
[0196] Then, the obtained quenched alloy is roughly pulverized to a size of 1 mm or less, and then heat-treated at 700° C. for 15 minutes in an argon flow to obtain Fe having a fine crystal grain size of about 20 nm in average grain size. 3 Phase B and Nd 2 Fe 14 Phase B mixes nanoco...
Embodiment 3
[0210] In this example, considering the mass production of bonded magnets, the compounding ratio of the first rare earth alloy powder and the second rare earth alloy powder is discussed.
[0211] As the ferrous-based rare earth alloy powder, the nanocomposite magnet powder having the same composition as in Example 2 was used. However, considering the deviation of magnetic properties during mass production, nanocomposite magnet powders with relatively low magnetic properties (B r : 0.92T,H cj : 370kA / m, (BH) max : 73kJ / m 3 ). The particle size of this magnet powder is below 53 μm, the average particle size is below 38 μm, and the aspect ratio is 0.88.
[0212]As the ferric-based rare earth alloy powder, MQP15-7 was used. In Example 2, the particle size distribution was adjusted by classifying MQP15-7 (average particle diameter: 100 μm), but in this example, only coarse particles with a particle diameter of 300 μm or more were removed, and the obtained MQP15-T was used as i...
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