Study on Nickel Alloy Base Self-Lubricating Composite

According to the technique requirements of distributing valve of engine used under the conditions of high temperature and high pressure, the nickel alloy base self-lubricating composites containing silver and graphite were prepared using hot-press processing, and the distributing valve seat was made to realize self-lubrication. The whole course power test of 430 seconds confirmed that three nickel alloy base self-lubricating composites have not given any breakage, among them, the composite (nickel alloy : silver : graphite = 70 : 15 : 15) has the advantages of high mechanical strength, low friction coefficient, good antiwear property, homogeneous structure, stable performances, good repeatability , easy machine finishing and high production. The distributing valve seat and the TZM alloy valve body pair up with valve seat can be all run over three whole courses. Their total wear volumes are all within the range of machine finishing tolerance. This research work opens a new technique way for developing the high-temperature self-lubricating composites and has the obvious technical and economical benefit.