Patent ID: 7615133

Claim:
An electrostatic chuck module comprising: an electrostatic chuck plate; a cooling plate bonded to the electrostatic chuck plate comprising a body formed by bonding an upper portion to a lower portion, wherein each of said upper and lower portions is made by forging a 100% metal composite comprising at least one metal material selected from a group consisting of Cu—W, Cu—W—Ni, Cu—Mo, and Cu—Mo—Ni; a plurality of projections in a space between the upper portion and the lower portion; and a coolant filling in the space; wherein the forging of each of the upper and lower portions is conducted such that a theoretical density ratio is 97% or more and a forging ratio is 5% or more; and wherein said electrostatic chuck module has a leakage amount of ≦7.5×10 −9 (Pa·m 3 /sec) as determined by HOOD TEST.