【WE CLAIM:】【Claim 1】
An annealing separator composition for an oriented electrical steel sheet,
the composition comprising:
5 100 weight parts of at least one of a magnesium oxide and a
magnesium hydroxide; and
5 to 200 weight parts aluminum hydroxide.
【Claim 2】
10 The annealing separator composition of claim 1, wherein
the aluminum hydroxide has an average particle size of 5 to 100 μm.
【Claim 3】
The annealing separator composition of claim 1, further comprising
15 1 to 10 weight parts of ceramic powder.
【Claim 4】
The annealing separator composition of claim 3, wherein
the ceramic powder is at least one selected from Al2O3, SiO2, TiO2, and 20 ZrO2.
【Claim 5】
The annealing separator composition of claim 1, further comprising
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50 to 500 weight parts of a solvent.
[Claim 6]
An oriented electrical steel sheet comprising a coating including an Al-5 Si-Mg composite formed on one or opposite sides of a substrate of an oriented electrical steel sheet.
[Claim 7]
An oriented electrical steel sheet of claim 6, wherein 10 the coating contains 0.1 to 40 wt% of Al, 40 to 85 wt% of Mg, 0.1 to 40 wt% of Si, 10 to 55 wt% of O, and Fe as a balance.
[Claim 8]
The oriented electrical steel sheet of claim 6, wherein 15 the coating further includes an Mg-Si composite, an Al-Mg composite, or an Al-Si composite.
[Claim 9]
The oriented electrical steel sheet of claim 6, wherein 20 the coating has a thickness of 0.1 to 10 μm.
[Claim 10]
The oriented electrical steel sheet of claim 6, wherein
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an oxide layer is formed from an interface between the coating and the substrate to an interior of the substrate
【Claim 11】
5 The oriented electrical steel sheet of claim 10, wherein
the oxide layer contains an aluminum oxide.
【Claim 12】
The oriented electrical steel sheet of claim 11, wherein
10 an average particle diameter of the aluminum oxide is 5 to 100 μm with
respect to a cross-section in a thickness direction of the steel sheet.
【Claim 13】
The oriented electrical steel sheet of claim 11, wherein
15 an occupying area of the aluminum oxide relative to an area of the oxide
layer is 0.1 to 50 % with respect to the cross-section in the thickness direction of the steel sheet.
【Claim 14】
20 The oriented electrical steel sheet of claim 6, wherein
the substrate of the oriented electrical steel sheet contains 2.0 to 7.0 wt% of silicon (Si), 0.020 to 0.040 wt% of aluminum (Al), 0.01 to 0.20 wt% of manganese (Mn), 0.01 to 0.15 wt% of phosphorus (P), 0.01 wt% or less
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(excluding 0 wt%) of carbon (C), 0.005 to 0.05 wt% of nitrogen (N), and 0.01 to 0.15 wt% of antimony (Sb), tin (Sn), or a combination thereof, and the balance contains Fe and other inevitable impurities.
5 【Claim 15】
A manufacturing method of an oriented electrical steel sheet, the method comprising:
preparing a steel slab;
heating the steel slab;
10 forming a hot-rolled sheet by hot-rolling the heated steel slab;
forming a cold-rolled sheet by cold-rolling the hot-rolled sheet;
performing first recrystallization annealing on the cold-rolled sheet;
applying an annealing separator on a surface of the steel sheet that has
been subjected to the first recrystallization annealing; and
15 performing second recrystallization annealing on the steel sheet on
which the annealing separator is applied,
wherein the annealing separator may contain 100 weight parts of at least one of magnesium oxide and magnesium hydroxide, and 5 to 200 weight parts of aluminum hydroxide.
20
【Claim 16】
The manufacturing method of claim 15, wherein
the performing of the first recrystallization annealing on the cold-rolled sheet includes
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simultaneously performing decarburizing annealing and nitriding annealing on the cold-rolled sheet or performing the nitriding annealing after the decarburizing annealing.