Gel injection moulding preparation for gradient material in rotating magnetic field
A technology of rotating magnetic field and gradient materials, which is applied in clay preparation devices, chemical instruments and methods, manufacturing tools, etc., can solve problems such as low density, complexity, and sudden change in composition, and achieve simplified procedures, strong constraints, and reduced costs Effect
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Embodiment 1
[0029] 1) Slurry preparation
[0030] BaO·6Fe with an average particle size of 0.1 μm 2 o 3 Powder and Al with an average particle size of 0.1 μm 2 o 3 The powder is composed of a mixed powder in a ratio of 1:10; the organic monomer acrylamide (AM) and the crosslinking agent methylenebisacrylamide (MBAM) are dissolved in deionized water at a weight ratio of 6:1 to form the mass fraction of organic matter 10% premix; add the mixed powder to the premix, and at the same time add ammonium polyacrylate as a dispersant with a mass fraction of 0.05% of the slurry, mill in a ball mill for 1 hour, and perform ultrasonic dispersion treatment for 1 minute to obtain a dispersed slurry. The solid phase volume content in the material is 50%, and then the pH value is adjusted to 5.0 with 15% concentrated ammonia water and 15% concentrated hydrochloric acid.
[0031] 2) Injection molding in a rotating magnetic field
[0032] Add 1 wt.% persulfuric acid aqueous solution initiator and 0.5‰...
Embodiment 2
[0037] 1) Slurry preparation
[0038] SmCo with an average particle size of 0.9 μm 5 Powder and ZrO with an average particle size of 0.6 μm 2 and Y 2 o 3 The powder is mixed in a ratio of 1:4 to form a mixed powder; the organic monomer methacrylamide and the crosslinking agent methylenebisacrylamide (MBAM) are dissolved in deionized water at a weight ratio of 15:1, and the mass fraction of the organic matter is 20% premix; add the mixed powder to the premix, and at the same time add dispersant SD-38 with a content of 0.2% by mass of the slurry, mill in a ball mill for 6 hours, and ultrasonically disperse for 8 minutes to obtain a dispersed slurry. The volume content of solid phase in the material is 65%, and then the pH value is adjusted to 8.2 with 25% concentrated ammonia water and 30% concentrated hydrochloric acid.
[0039] 2) Injection molding in a rotating magnetic field
[0040] Add 3wt.% persulfuric acid aqueous solution initiator and tetramethylethylenediamine ca...
Embodiment 3
[0045] 1) Slurry preparation
[0046] Nickel powder with an average particle size of 8 μm and SiC and TiC powders with an average particle size of 3 μm were mixed in a ratio of 1:1; the organic monomer vinylpyrrolidone and the crosslinking agent methylenebisacrylamide (MBAM) were mixed according to Dissolve it in deionized water at a weight ratio of 24:1 to prepare a premixed solution with a mass fraction of organic matter of 25%; add the mixed powder to the premixed solution, and at the same time add dispersant JA-281 with a content of 0.5% by mass of the slurry, Ball milling in a ball mill for 10 hours, ultrasonic dispersion treatment for 15 minutes to obtain a dispersed slurry, the solid phase volume content in the slurry is 70%, and then the pH value is adjusted to 12 with 38% concentrated ammonia water and 40% concentrated hydrochloric acid.
[0047] 2) Injection molding in a rotating magnetic field
[0048] Add 5 wt.% persulfuric acid aqueous solution initiator and tetr...
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