Patent ID: 9711334
Date: 2017-07-18
CPC Classifications: C23C,H01J,Y10T

Claim:
1. A method of manufacturing an article comprising: loading a ring shaped body into a deposition chamber, wherein the ring shaped body is a sintered ceramic body comprising a top flat region, a ring inner side and a ring outer side, wherein the ring inner side comprises a step and a vertical wall and the ring outer side is rounded; performing ion assisted deposition to deposit a protective layer on at least the top flat region, the ring inner side and the ring outer side of the ring shaped body, wherein the protective layer is a plasma resistant rare earth oxide film having a first thickness of less than 300 μm on the top flat region and a second thickness on the vertical wall of the ring inner side, wherein the second thickness is 45-70% of the first thickness, and wherein the protective layer is a conformal layer having a porosity of less than or equal to about 0.1%; and flame polishing the protective layer on the ring shaped body to an average surface roughness of below 6 micro-inches.