Patent ID: 6679961
Filing Date: 2004-01-20
Classification: C04B,Y10T

Abstract:
A method of making a ceramic discharge chamber comprising the steps of:forming ceramic compositions including a ceramic powder, a binder, and a grain growth inhibitor, said ceramic powder having a tap density greater than 1.0 gram per cc, die pressing a said ceramic composition to form a preform cylindrical ceramic body member, die pressing a said ceramic composition to form a preform leg member having a disc shaped body and an axially extending leg element, the ceramic compositions' densities for forming the body member and the leg member preforms being different from each other, machining said preform component to form a bore through said leg and said disc shaped body, positioning said preform leg member in an end of said cylindrical ceramic body member, and sintering the preforms to allow controlled shrinkage to join the leg member and the cylindrical ceramic body, the different densities in the leg and the body member causing a lesser shrinkage in the leg member and a greater shrinkage in the body member to form an enhanced seal.