Methods of Improving Cylinder Liner Wear 2000-01-0926
Ring/liner wear is a major factor in determining effective engine life. One of the primary goals of engine manufactures is to design engines for increased durability. In order to preserve knowledge that was gained over the years with current liner materials and to meet target costs, methods of improving the wear resistance of the liner material without changing the substrate from gray cast iron are attractive. In addition, stringent emission requirements pose a larger challenge to the materials community. For example, cooled exhaust gas recirculation (EGR) is one option to meet US EPA NOx emissions for the year 2002. With the application of cooled EGR technology, the present durability of current ring/liner materials may be reduced.
Three methods to improve the wear resistance of gray cast iron liners are 1) adding special alloying elements 2) using surface treatment techniques such as induction hardening, gas nitriding, etc. 3) applying surface coatings. This paper discusses the investigation of the first two approaches by running laboratory wear tests using Cameron-Plint apparatus.
Our data revealed that 1) the wear behavior of induction hardened and specially alloyed gray cast iron is better than the gray cast iron. 2) Used oil has increased the liner wear significantly as compared to new oil.