BaFe12O19/CoFe2O4 layered permanent magnetic composite material and preparation method thereof
A technology of bafe12o19 and composite materials, which is applied in the field of material science, can solve problems affecting magnetic properties and exchange coupling effects, and achieve the effects of easy large-scale production, suppression of mutual reactions, and simple processes
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[0035] Example 1
[0036] A BaFe 12 O 19 / CoFe 2 O 4 The chemical expression of the layered permanent magnetic composite is (1-x)BaFe 12 O 19 / xCoFe 2 O 4 , Where x is CoFe 2 O 4 The mass percentage of, and x = 11.1%.
[0037] Above BaFe 12 O 19 / CoFe 2 O 4 The preparation method of the layered permanent magnetic composite material includes the following steps:
[0038] 1) According to the general chemical formula BaFe 12 O 19 Will analyze pure BaCO 3 , Fe 2 O 3 After preparation (ie mixing), wet ball milling for 4 hours, then drying, sieving, briquetting, calcining at 1150°C for 6 hours, then crushing the obtained block sample and passing it through a 120 mesh sieve to obtain BaFe 12 O 19 Powder.
[0039] 2) To BaFe 12 O 19 The powder is granulated by adding 10% polyvinyl alcohol aqueous solution, and then sieved through a 60-mesh screen to obtain BaFe 12 O 19 Powder; Among them, the quality of the polyvinyl alcohol aqueous solution is BaFe 12 O 19 12% of powder mass;
[0040] 3) Accor...
Example Embodiment
[0047] Example 2
[0048] A BaFe 12 O 19 / CoFe 2 O 4 The chemical expression of the layered permanent magnetic composite is (1-x)BaFe 12 O 19 / xCoFe 2 O 4 , Where x is CoFe 2 O 4 The mass percentage of, and x=22.2%.
[0049] Above BaFe 12 O 19 / CoFe 2 O 4 The preparation method of the layered permanent magnetic composite material includes the following steps:
[0050] 1) According to the general chemical formula BaFe 12 O 19 Will analyze pure BaCO 3 , Fe 2 O 3 After preparation (ie mixing), wet ball milling for 4 hours, then drying, sieving, briquetting, pre-burning at 1200°C for 4 hours, then crushing the resulting block sample and passing it through a 120 mesh sieve to obtain BaFe 12 O 19 Powder.
[0051] 2) To BaFe 12 O 19 Add 10% polyvinyl alcohol aqueous solution to the powder, then granulate, then pass through a 60-mesh screen to obtain BaFe 12 O 19 Powder; Among them, the quality of the polyvinyl alcohol aqueous solution is BaFe 12 O 19 10% of powder mass;
[0052] 3) According t...
Example Embodiment
[0059] Example 3
[0060] A BaFe 12 O 19 / CoFe 2 O 4 The chemical expression of the layered permanent magnetic composite is (1-x)BaFe 12 O 19 / xCoFe 2 O 4 , Where x is CoFe 2 O 4 The mass percentage of, and x=33.3%.
[0061] Above BaFe 12 O 19 / CoFe 2 O 4 The preparation method of the layered permanent magnetic composite material includes the following steps:
[0062] 1) According to the general chemical formula BaFe 12 O 19 Will analyze pure BaCO 3 , Fe 2 O 3 After preparation (ie mixing), wet ball milling for 4 hours, then drying, sieving, briquetting, pre-burning at 1170°C for 5 hours, then crushing the resulting block sample and passing it through a 120 mesh sieve to obtain BaFe 12 O 19 Powder.
[0063] 2) To BaFe 12 O 19 Add 10% polyvinyl alcohol aqueous solution to the powder, then granulate, then pass through a 60-mesh screen to obtain BaFe 12 O 19 Powder; Among them, the quality of the polyvinyl alcohol aqueous solution is BaFe 12 O 19 8% of powder mass;
[0064] 3) According to...
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