Lubrication properties of silver-palladium alloy prepared by
ion plating method for high temperature stud bolt
ion plating method for high temperature stud bolt
(1. Materials Processing Division, Korea Institute of Materials Science, Changwon, Gyeongnam 641-831, Korea;
2. National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan 609-735, Korea)
2. National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan 609-735, Korea)
Abstract: As a solid lubricant, silver-palladium (Ag-Pd) alloy coating was investigated for the application to high temperature stud bolt. A glue layer nickel (Ni) film was deposited on the surface of the hex bolt sample and then Ag-Pd alloy coating was performed on it using ion plating method. The friction coefficient of Ag-Pd alloy film coated bolt was lower than that of N-5000 oil coated bolt by the result of axial force measurement. The cyclic test of heat treatment was conducted to evaluate the durability of Ag-Pd alloy film coated bolt. In a cycle, sample was assembled into the block using torque wrench, followed by heating and disassembling. It was not successful to disassemble the N-5000 oil coated bolt from the block after only one cycle. However, the Ag-Pd alloy film coated bolt was able to be disassembled softly till 12 cycles.
Key words: solid lubricant; silver-palladium alloy; ion plating