HIGH VELOCITY OXYGEN FUEL (HVOF) SPRAY COATING OF COBALT ALLOY POWDER FOR DURABILITY IMPROVEMENT OF HIGH SPEED SPINDLE OPERATING WITHOUT LUBRICANT

摘要

PURPOSE: A HVOF coating with a cobalt powder for improving the durability of a non-lubricated high velocity rotary body is provided to coat the surface of the high velocity rotary body with a cobalt alloy powder by using the HVOF, thereby improving the eco-unfriendly problem of an EHC coating. CONSTITUTION: An HVOF coating with a cobalt alloy powder is a method for coating the surface of a high velocity rotary body with the cobalt alloy powder using the HVOF. The coating is implemented at 38 to 42 FMR(Flow Meter Reading)( 3.59X10-3 to 3.96X10-3m3 per second) of oxygen flow rate, 60 to 75 FMR(5.66X10-3 to 7.08X10-3m3 per second) of hydrogen flow rate, 30 grams per minute of powder supply velocity, and at a spray distance of 5 inches. The high velocity rotary body is formed with an Inconel series or a titanium alloy. The velocity of a spray gun is set to 3 millimeters per second. A manufactured coating material is air cooled by using 180 psi(pound per square inch) of argon gas as powder carrier gas.