Patent ID: 8319141

Claim:
A cooling block that forms an electrode for generating plasma for use in a plasma process, and that includes a channel for a cooling liquid, the cooling block comprising: a first base material and a second base material respectively made of aluminum, at least one of the first and second base materials having a recess for forming a channel for a cooling liquid; a first stainless plate bonded to the first base material; a second stainless plate bonded to the second base material; and a diffusion bonding layer of stainless and stainless formed at a position where the first stainless plate and the second stainless plate are bonded to each other, the diffusion bonding layer being formed by bonding the first base material, the second base material, the first stainless plate, and second stainless plate, with the first and second stainless plates being opposed and in tight contact with each other, wherein a diffusion bonding layer of stainless and aluminum is formed at a position where the first aluminum base material and the first stainless plate are bonded to each other, and a diffusion bonding layer of stainless and aluminum is formed at a position where the second aluminum base material and the second stainless plate are bonded to each other.