Method for preparing phosphorus-containing silicon steel sheet with high magnetic performance through powder sintering
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A technology of powder and silicon steel, which is applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problems of difficult forming of spherical gas atomized powder and shorten the process flow of high silicon steel sheets, so as to promote activation sintering and reduce iron loss , the effect of high yield
Inactive Publication Date: 2021-05-28
UNIV OF SCI & TECH BEIJING
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At the same time, under the synergistic effect of low melting point P element and powder pressing and sintering (high melting point heavy objects are pressed and sintered), the defect that the spherical gas atomized powder is difficult to form is solved, thereby avoiding the process complexity caused by the addition of organic forming agents. Subsequent degumming and residual carbon problems effectively shorten the process flow for preparing high silicon steel sheets
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Embodiment example 1
[0028] (1) D50 is the alloy powder of Fe-5wt.%Si-0.45wt.%P of 23 μm prepared by vacuum smelting gas atomization;
[0029] (2) Put the gas-atomized powder in a ceramic crucible and vibrate evenly. The thickness of the powder is about 9mm. After covering a ceramic plate with a suitable size, place a 4kg high-melting point weight on top to obtain the whole preset powder;
[0030] (3) Vacuum sinter the pre-prepared powder as a whole at 1130°C for 3 hours, remove the high melting point weight and the ceramic plate after cooling, and take out the sintered slab from the crucible;
[0031] (4) After heating the sintered slab to 800°C, perform 6 passes of hot rolling until the thickness of the slab is 0.42mm;
[0032] (5) Heat the hot-rolled plate to 900°C for 30 minutes under an argon protective atmosphere, and then carry out oil quenching;
[0033] (6) After pickling fully removes the surface scale, carry out 2 times of cold rolling to a slab thickness of 0.25mm;
[0034] (6) Vacuu...
Embodiment example 2
[0036] (1) D50 is the alloy powder of Fe-5.8wt.%Si-0.8wt.%P of 35 μm prepared by vacuum smelting gas atomization;
[0037] (2) Place the gas-atomized powder in a ceramic crucible and vibrate evenly, the powder thickness is 8.5mm, cover a ceramic plate with a suitable size and place a 2kg high melting point weight on top to obtain the whole preset powder;
[0038] (3) Vacuum sinter the pre-set powder as a whole at 1060°C for 2 hours, remove the high-melting point weight and the ceramic plate after cooling, and take out the sintered slab from the crucible;
[0039] (4) After heating the sintered slab to 850°C, carry out 7 passes of hot rolling until the thickness of the slab is 0.36mm;
[0040] (5) Heat the hot-rolled sheet to 950°C for 20 minutes under an argon protective atmosphere, and then carry out oil quenching;
[0041] (6) After pickling fully removes scale, carry out 3 times of cold rolling to 0.22mm of slab thickness;
[0042] (6) Vacuum anneal the cold-rolled slab a...
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Abstract
The invention discloses a method for preparing a phosphorus-containing silicon steel sheet with high magnetic performance through powder sintering, and belongs to the technical field of powder metallurgy. Alloy powder with the component range of Fe-(3-6.5) wt.% Si-(0.05-1) wt.% P is prepared through vacuum melting and gas atomization, the alloy powder is placed in a ceramic crucible to be evenly compacted, a heavy object is placed for pressing, then high-temperature sintering is conducted to enable the alloy powder to be metallurgically bonded, and after hot rolling, cold rolling, annealing and other treatment are conducted, the phosphorus-containing silicon steel sheet with the excellent performance is obtained. A P element is added into a silicon steel material system, iron loss can be effectively reduced, the magnetic performance is optimized, and activated sintering is promoted; the gas atomization powder is adopted, so that few inclusions and the purity of the product can be well ensured; and under the synergistic effect of the low-melting-point P element and powder pressure sintering, the defect that spherical gas atomization powder is difficult to form is overcome, the problems of process complexity and subsequent degumming and carbon residues caused by the fact that a forming agent needs to be added are avoided, the preparation process flow is effectively shortened, and the method has the beneficial effects of being easy to operate, high in production efficiency, short in process flow, excellent in performance and the like.
Description
technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a method for preparing silicon steel sheets with high magnetic performance and phosphorus content through powder sintering. Background technique [0002] Today, silicon steel is still an important magnetic material for the electric, electronic and telecommunications industries to manufacture generators, motors, transformers, relays, transformers and other electrical instruments, and is one of the most productive metallic functional materials. The magnetic properties of silicon steel are positively correlated with its Si content. With the increase of Si content, the resistivity of silicon steel increases significantly, the eddy current loss decreases, and the relative magnetic permeability increases. However, the increase of silicon content will reduce the saturation magnetization and Curie temperature, and at the same time, it will make the material hard and brittle, and ...
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