Patent ID: 8908349

Claim:
A member for a semiconductor manufacturing apparatus, comprising: a ceramic substrate having a wafer placement surface; an electrode embedded in the inside of the ceramic substrate; an exposed electrode portion which is a part of the electrode and which is exposed at the surface opposite to the wafer placement surface of the ceramic substrate; a power feed member to supply an electric power to the electrode; and a joining layer which is interposed between the ceramic substrate and the power feed member and which joins the power feed member to the ceramic substrate and, at the same time, electrically connects the power feed member to the exposed electrode portion, wherein the joining layer is formed by using a AuGe based alloy, a AuSn based alloy, or a AuSi based alloy, which is a joining material, the ceramic substrate and the power feed member are selected in such a way that the thermal expansion coefficient difference D calculated by subtracting the thermal expansion coefficient of the ceramic substrate from the thermal expansion coefficient of the power feed member satisfies −2.2≦D≦6 (unit: ppm/K), and the joint strength at 200° C. is 3.5 MPa or more.