High weather resistance magnetic powder and magnet using said magnet powder
A technology of weather resistance and magnet powder, applied in the resin composition for bonded magnets, bonded magnets or compacted magnets, can solve the problem of insufficient weather resistance, improve weather resistance and prevent magnetic properties Deterioration of , the effect of high industrial value
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Embodiment 1～5、 comparative example 1～4
[0070] 1 kg of the reduced magnet alloy powder was pulverized in 1.5 kg of isopropanol at a rotation speed of 200 rpm for 2 hours using a pulverizer whose interior of the container was replaced with nitrogen, to produce magnet powder with an average particle diameter of 3 μm. During pulverization or after pulverization, a predetermined amount of 85% orthophosphoric acid aqueous solution described in Table 1 was added to the powder and mixed. The magnet powder was then dried in vacuum at 120° C. for 4 hours. The film thickness and Fe / rare earth element ratio of the obtained magnet powder were measured by the above-mentioned method, and the results shown in Table 1 were obtained.
[0071] Next, 12 Nylon was added to the obtained magnet powder so that the volume ratio of the magnetic powder became 54%, and after kneading with a test plastic mill, injection molding was performed to produce a bonded magnet. The coercive force of the obtained magnet samples was measured by the abov...
Embodiment 6
[0073] Using a pulverizer that replaces the inside of the container with nitrogen, mix and pulverize 1 kg of reduced magnet alloy powder and 30 g of zinc powder (3 wt% of the magnet alloy powder) in 1.5 kg of isopropanol at a rotational speed of 200 rpm for 1 hour, and then at 1 liter / min It was heat-treated at 430° C. for 10 hours while flowing Ar gas, cooled to room temperature, and taken out. The obtained agglomerated powder or the surface is coated with zinc. Next, 85% concentrated phosphoric acid aqueous solution was added to the solvent of isopropanol aqueous solution, and it grind|pulverized by the pulverizer for 20 minutes. The amount of phosphoric acid added in the aqueous orthophosphoric acid solution was 0.30 mol of phosphoric acid per 1 kg of the coated aggregated powder. Then the magnet powder was dried in vacuum at 120° C. for 4 hours. The film thickness and Fe / rare earth element ratio of the obtained magnet powder were measured by the above-mentioned method, a...
Embodiment 7
[0078] With respect to the magnet powders of Example 4 and Comparative Example 3 in which substantially the same film thickness and Fe / rare earth element ratio were obtained with the same phosphoric acid addition amount, the coverage rate of the phosphate film was measured. The measurement of the coverage rate is to immerse the magnet sample in the organic solution, take out the magnet powder, observe the powder section with a transmission electron microscope, and at the same time randomly select 20 places near the particle surface, and analyze the magnet powder with a dispersive X-ray detector. Surface P is carried out. As a result, in Example 4 in which phosphoric acid was added to the crushing of magnet alloy powder, P could be detected at all locations, but in Comparative Example 3 in which phosphoric acid was added after crushing, P was detected at only 15 locations (75%). p. In addition, when the analysis of P was carried out by randomly selecting 5 locations for the ma...
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Abstract
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