Patent ID: 6261648
Filing Date: 2001-07-17
Classification: C23C,G21B,Y02E

Abstract:
A method of forming a plasma facing surface on a substrate formed of predetermined material by chemical vapor deposition in a reaction chamber, said method comprising:uniformly depositing, on the substrate, a tungsten layer at a deposition rate of 360 .mu.m/hour to a thickness of 2.5 mm by heating the substrate to a predetermined temperature, rotating the substrate at a predetermined speed, supplying a hydrogen gas and a WF.sub.6 gas into the reaction chamber to form a mixture of the hydrogen gas and the WF.sub.6 gas having a ratio of the WF.sub.6 gas to the hydrogen gas of 1:5 to maintain a pressure of the reaction chamber at 1.3 kPa, and causing the mixed hydrogen and WF.sub.6 to flow at a predetermined flow rate.