Nickel-based ultrafine powder
a technology of ultrafine powder and nickel, applied in the direction of fixed capacitor details, stacked capacitors, transportation and packaging, etc., can solve the problem of dielectric materials cracking, and achieve the effect of rejecting ra
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example 1
[0024] Three kinds of gases, which were a gas produced by subliming nickel chloride, hydrogen gas, and nitrogen gas, were mixed so that the mole ratio of the gas produced by subliming nickel chloride became 0.10, and nickel powder was manufactured by the vapor-phase reaction in a reaction column heated to 1000 to 1100° C. Image analysis was performed for 4000 particles of the obtained nickel powder using the SEM, and the flow rate of the mixed gas in the reaction column was adjusted so that the average particle diameter of primary particles became 0.2 μm.
[0025] As a result of image analysis for 4000 particles of the obtained nickel powder using the SEM, the average particle diameter of primary particles was 0.21 μm, and the number of primary particles that had particle diameters of 0.12 μm (0.6 times the average particle diameter) or less was 4% of the total number of observed particles. The number of primary particles that had particle diameters of 1 μm or larger observed for 512,...
example 2
[0028] A water slurry was prepared from nickel powder obtained by vapor-phase reaction in Example 1, the nickel powder was sufficiently dispersed in water using a dispersing machine equipped with an ultrasonic vibrator, and then the slurry was classified using an imperforate-wall basket-type centrifugal separator with a skimming pipe (internal capacity: 3 L, basket inner diameter: 300 mm, water slurry supply rate: 2.5 L / min, rotation speed: 1400 rpm), and water slurry discharged from the skimming pipe, specifically, the water slurry contained nickel powder from which coarse particles had been removed, was collected. The collected slurry was pressure dehydrated and vacuum dried to recover the nickel powder.
[0029] As a result of image analysis for 4000 particles of the obtained nickel powder using the SEM, the average particle diameter of primary particles was 0.20 μm, and the number of primary particles that had particle diameters of 0.12 μm (0.6 times the average particle diameter)...
example 3
[0030] Three kinds of gases, which were a gas produced by subliming nickel chloride, hydrogen gas, and nitrogen gas, were mixed so that the mole ratio of the gas produced by subliming nickel chloride became 0.17, and nickel powder was manufactured by the vapor-phase reaction in a reaction column heated to 1000 to 1100° C. Image analysis was performed for 4000 particles of the obtained nickel powder using the SEM, and the flow rate of the mixed gas in the reaction column was adjusted so that the average particle diameter of primary particles became 0.3 μm.
[0031] As a result of image analysis for 4000 particles of the obtained nickel powder using the SEM, the average particle diameter of primary particles was 0.27 μm, and the number of primary particles that had particle diameters of 0.16 μm (0.6 times the average particle diameter) or less was 9% of the total number of observed particles. The number of primary particles that had particle diameters of 1 μm or larger observed for 512,...
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