Method for preparing single-phase Fe-6.5% Si silicon steel by powder hot pressing sintering process
A technology of hot pressing sintering and powder, which is applied in metal processing equipment, transportation and packaging, etc., and can solve the problem that thin alloy strips are difficult to form
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Embodiment 1
[0045] Mix -100 mesh reduced Fe powder with elemental Si powder with a particle size ≤ 3 μm at a ratio of 93.3:6.7 to form a mixed powder of Fe-6.7% Si. When mixing, add 0.6% paraffin micropowder and 0.1% engine oil of the total amount of raw materials. Dehydrated alcohol is added according to the amount of 200ml / ton. The above powders were mixed for 4 h using a V-shaped blender.
[0046] A square compact was prepared by compression molding, with a surface pressure of 600MPa, a compact size of 100×100×40mm, and a compact density of 6.32g / cm 3 .
[0047] 100MPa uniaxial pressure hot pressing sintering, hot pressing sintering at 920°C for 2 hours, the thickness of the billet is about 39mm, and the density reaches 6.68g / cm 3 . Three-point bending tests exhibit plasticity, see figure 1 , the bending strength reaches 219MPa.
[0048] The above-mentioned hot-pressed sintered plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 39mm→2...
Embodiment 2
[0052] Mix -100 mesh reduced Fe powder with elemental Si powder with a particle size of ≤3 μm at a ratio of 95.5:4.5 to form a mixed powder of Fe-4.5% Si. When mixing, add 0.7% zinc stearate and 0.1% machine oil of the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton. The above powders were mixed for 6 h using a drum mixer.
[0053] A square compact was prepared by compression molding, with a surface pressure of 400MPa, a compact size of 300×300×60mm, and a compact density of 6.49g / cm 3 .
[0054] 160MPa uniaxial pressure hot-press sintering, hot-press sintering at 980°C for 0.5h, the thickness of the billet is about 54mm, and the density reaches 7.0g / cm 3 . The three-point bending test showed plasticity, and the bending strength reached 427MPa.
[0055] The above-mentioned hot-pressed sintered plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 54mm→36mm→36mm→24mm→17mm→12mm→9.5mm→...
Embodiment 3
[0060] Mix -100 mesh reduced Fe powder with elemental Si powder with a particle size ≤ 3 μm in a ratio of 93.5:6.5 to form a mixed powder of Fe-6.5% Si. When mixing, add 0.4% paraffin micropowder, 0.2% methylcellulose, and 0.1% motor oil in the total amount of raw materials. Dehydrated alcohol is added according to the amount of 400ml / ton. The above powders were mixed for 6 h using a drum mixer.
[0061] A square compact was prepared by compression molding, with a surface pressure of 500MPa, a compact size of 220×220×50mm, and a compact density of 6.36g / cm 3 .
[0062] 120MPa uniaxial pressure hot-press sintering, hot-press sintering at 950°C for 1h, the thickness of the billet is about 46mm, and the density reaches 6.72g / cm 3 . The three-point bending test showed plasticity, and the bending strength reached 229MPa.
[0063] The above-mentioned hot-pressed sintered plate is cold-rolled-sintered and gradually thinned. The specific pressing-annealing system is: 46mm→36mm→2...
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