一种使用软磁性材料粉末制造压敏芯的方法，包括以下步骤：将软磁性材料粉末和粘合剂混合的第一步骤;将通过第一步骤获得的混合物压制成型的第二步骤; 第三步，对得到的成型体进行热处理，其中软磁性材料粉末是含Fe，Cr和Al的Fe-Cr-Al基合金粉末以及海洋软磁性材料粉末表面的内表面， 形成与Fe，Cr和Al的组合具有高Al比的氧化物层。

A method for producing a powder magnetic core using the soft magnetic material powder, a second step of press-molding a first step, a mixture obtained after the first step of mixing a soft magnetic material powder and a binder, after the second step and a third step of heat-treating the obtained molded article, and the soft magnetic material powder is Fe, Cr and Fe-Cr-Al based alloy powder containing Al, inside by the heat treatment in a mass ratio to the surface of the soft magnetic material powder the sum of the ratio of Al to the phase than Fe, Cr and Al alloy to form a high oxide layer.