Electrical steel sheet laminate
An embodiment of the present invention provides an electrical steel sheet laminate, including: a plurality of electrical steel sheets; and a fusion layer disposed between the electrical steel sheets, wherein the fusion layer includes an olefin-based semi-crystalline polymer and at least one inorganic metal compound of a metal phosphate and a metal chromate.
1. An electrical steel sheet laminate comprising:
a plurality of electrical steel sheets; and
a fusion layer disposed between the electrical steel sheets,
wherein the fusion layer includes: an olefin-based semi-crystalline polymer at 85 to 95 wt %, and
at least one inorganic metal compound at 5 to 15 wt % among a metal phosphate and a metal chromate,
wherein the an olefin-based semi-crystalline polymer has crystallinity of 50 to 90, and
wherein the electrical steel sheet laminate has a microphase of the inorganic metal compound in the fusion layer, and with respect to a cross-section including a thickness direction of the fusion layer, a fraction of an area occupied by the microphase of the at least one inorganic metal compound is 10% or less.
2. The electrical steel sheet laminate of claim 1 , wherein
the olefin-based semi-crystalline polymer includes at least one of a polyethylene semi-crystalline polymer and a polypropylene semi-crystalline polymer.
3. The electrical steel sheet laminate of claim 1 , wherein
the olefin-based semi-crystalline polymer has a weight average molecular weight of 1000 to 30,000.
4. The electrical steel sheet laminate of claim 1 , wherein
the olefin-based semi-crystalline polymer has a softening point of 50 to 120° C.
5. The electrical steel sheet laminate of claim 1 , wherein
the metal phosphate and the metal chromate have at least one metal of Al, Mg, Ca, Co, Zn, Zr, and Fe.
6. The electrical steel sheet laminate of claim 1 , wherein
an average particle diameter of the microphase of the inorganic metal compound is 20% or less of a thickness of the fusion layer.
7. The electrical steel sheet laminate of claim 1 , wherein
the thickness of the fusion layer is 0.5 to 40 μm.
8. The electrical steel sheet laminate of claim 1 , further comprising
a fusion interface layer disposed between the electrical steel sheets and the fusion layer.
9. The electrical steel sheet laminate of claim 8 , wherein
the fusion interface layers 20 include at least one metal of Al, Mg, Ca, Co, Zn, Zr, and Fe in a total amount of 0.5 to 10 wt %, and at least one of P and Cr in a total amount of 5 to 30 wt % and a balance of O.
10. The electrical steel sheet laminate of claim 8 , wherein
the thickness of the fusion layer is 10 to 500 nm.