Electrode wire for electrical discharge machining and preparation method thereof
An electrode wire includes a brass core, a Cu—Zn alloy layer coated on the brass core, and a surface layer. The surface layer includes CuO, ZnO, Cu 2 (OH) 2 CO 3 , and a Cu—Zn intermetallic compound. The surface layer is in the shape of particles or sheets spaced apart on the Cu—Zn alloy layer; and the Cu—Zn alloy layer is exposed with respect to spaces between the particles or sheets.
1 . An electrode wire, comprising:
a brass core;
a Cu—Zn alloy layer coated on the brass core; and
a surface layer, the surface layer comprising CuO, ZnO, Cu 2 (OH) 2 CO 3 , and a Cu—Zn intermetallic compound;
wherein:
the surface layer is in the shape of particles or sheets spaced apart on the Cu—Zn alloy layer; and
the Cu—Zn alloy layer is exposed with respect to spaces between the particles or sheets.
2 . The electrode wire of claim 1 , wherein the surface layer comprises 4%-9.5% by mass of CuO, 44%-55% by mass of ZnO, 2%-10% by mass of Cu 2 (OH) 2 CO 3 , and 31%-44.5% by mass of the Cu—Zn intermetallic compound.
3 . The electrode wire of claim 1 , wherein the surface layer comprises a plurality of micropores each having a diameter of 0.01-2 μm.
4 . The electrode wire of claim 1 , wherein 60%-95% of the Cu—Zn alloy layer is covered by the surface layer.
5 . The electrode wire of claim 1 , wherein the surface layer has a thickness ranging from 2 μm to 7 μm.
6 . The electrode wire of claim 1 , wherein the Cu—Zn alloy layer comprises a β′ phase or a β′+γ phase.
7 . The electrode wire of claim 1 , wherein the Cu—Zn alloy layer has a thickness of 4-10 μm.