Patent ID: 9394206
Filing Date: 2016-07-19
CPC Classification: B32B,C04B,H01L,Y10T

Claim Text:
1. A method for producing an electrostatic chuck, comprising the steps of: (a) placing a ceramic slurry in a molding die, the ceramic slurry containing a ceramic powder, a solvent, a dispersing agent, and a gelling agent, gelatinizing the ceramic slurry by a chemical reaction induced by the gelling agent in the molding die, and removing the molding die to obtain a first ceramic molded body and a second ceramic molded body; (b) drying, debinding, and then calcining the first and second ceramic molded bodies to obtain a first ceramic calcined body and a second ceramic calcined body; (c) printing an electrostatic electrode paste on a surface of one of the first and second ceramic calcined bodies to form an electrostatic electrode while assuming the first ceramic calcined body is to form a dielectric layer of an electrostatic chuck; and (d) superposing the first and second ceramic calcined bodies on each other so as to sandwich the electrostatic electrode and subjecting the first and second calcined bodies in such a state to hot-press firing so as to prepare a ceramic sintered body, wherein the difference between a maximum thickness and a minimum thickness of the dielectric layer is 60 μm or less, and wherein ceramic grains constituting the dielectric layer have an average grain size of 0.7 to 1.2 μm and a ratio of the number of grains having a grain size equal to or less than the average grain size to the number of all grains is 60% or more.