Method for preparing gradient material of strong magnetism and weak magnetism through pressure filtration molding in pulse magnetism
A technology of pulsed magnetic field and filter press molding, which is applied in the direction of magnetic materials, ceramic molding machines, inorganic materials, etc., to achieve the effect of process simplification and cost reduction
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Embodiment 1
[0041] 1) Mix α-gypsum and β-gypsum with pure tap water, add polyethylene oxide, the content of which is 10% of the mass of the gypsum, stir for 4 minutes and pour. After the gypsum mold made by solidifying and hardening the gypsum slurry is dried, the inner cavity of the mold is a disc with a height of 30 mm and a diameter of 50 mm.
[0042] 2) Nickel powder with an average particle size of 3 μm and Al with an average particle size of 0.9 μm 2 o 3 The powder is mixed in a ratio of 1:1, and the mixed powder is continuously added to deionized solvent water, and hydrochloric acid is continuously added to adjust the pH value to 3 until the solid phase content reaches 40 vol%. Stirring in a ball mill for 4 hours, ultrasonic dispersion treatment was used to prepare a slurry, the humidity of the slurry was 30%, the temperature was 35° C., and the viscosity was 20 mPa·s.
[0043] 3) The mold temperature is 25°C during grouting, and the grout is filled into the plaster mold. A puls...
Embodiment 2
[0047] 1) Mix α-gypsum and β-gypsum with pure tap water at 20°C, add phenolic resin, the content of which is 10% of the mass of the gypsum, pour after stirring for 4 minutes, and solidify and harden the gypsum slurry. After drying, the inner cavity of the mold is a disc with a height of 30 mm and a diameter of 50 mm.
[0048] 2) Select diamond powder with strong magnetic properties with an average particle size of 4 μm and ZrO with an average particle size of 2.2 μm 2 The powder is composed of mixed powder in a ratio of 1:2, and the mixed powder is continuously added to deionized solvent water, and hydrochloric acid is continuously added to adjust the pH value to 4.2, until the solid phase content reaches 45vol%. Stir in a ball mill for 4 hours, and use ultrasonic Perform dispersion treatment. The humidity of the obtained pouring slurry is 35%, the temperature is 40° C., and the viscosity is 35 mPa·s.
[0049] 3) When grouting, the mold temperature is 27°C, the slurry is fil...
Embodiment 3
[0053] 1) Mix α-gypsum and β-gypsum with pure tap water at 20°C, add melamine resin, the content of which is 10% of the mass of the gypsum, pour after stirring for 4 minutes, and solidify and harden the gypsum slurry. After drying, the inner cavity of the mold is a disc with a height of 30 mm and a diameter of 50 mm.
[0054] 2) Select strong magnetic stainless iron powder with an average particle size of 10 μm and SiC powder with an average particle size of 5.2 μm to form a mixed powder in a ratio of 1:4, and continuously add the mixed powder to deionized solvent water, and Constantly add hydrochloric acid to adjust the pH value to 4.5 until the solid phase content reaches 40vol%, stir in a ball mill for 5 hours, and use ultrasonic waves for dispersion treatment. The obtained pouring slurry has a humidity of 30%, a temperature of 35° C., and a viscosity of 60 mPa·s.
[0055] 3) When grouting, the mold temperature is 27°C, the slurry is filled into the plaster mold, and a pul...
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