Wear layer for piston and cylinder of an internal combustion engine
AssigneeSulzer Brothers Limited
InventorsRoger Dekumbis, Marc-Olivier Borel, Ulrich Ritter, Gerard Barbezat
Life of this patent
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Abstract
A wear layer is provided for each of a piston and cylinder of an internal combustion engine in which ash-producing fuels of solid-liquid mixtures are combusted. Each layer consists of a hard phase and a second phase of lower hardness and greater toughness. Each wear layer has a minimum thickness of one millimeter; the hard phase has a minimum hardness of 1900 HV with a mean chord length in the running direction of from 30 to 200 microns. There is a metallurgical bond between the phases in the wear layer as well as between the wear layer and the substrate. In addition, the hard phases of the respective wear layers have an almost equal hardness value.
Claims12
In an internal combustion engine having a cylinder including a first surface and a piston movably mounted in said cylinder with a second surface in contact with said first surface, a wear layer metallurgically bonded on each said surface, each wear layer being of a thickness greater than one millimeter and having
- at least one hard phase of a hardness greater than 1900 HV in at least 80% thereof with a mean chord length in the direction of movement of said second surface of from 30 to 200 .mu.m, and
- a second phase metallurgically bonded to said hard phase with greater toughness than said hard phase and a hardness less than said hard phase.
A wear layer for a piston and a cylinder in an internal combustion engine, said wear layer being of a thickness greater than one millimeter and having
- at least one hard phase of a hardness greater than 1900 HV in at least 80% thereof with a mean chord length of from 30 to 200 .mu.m, and
- a second phase metallurgically bonded to said hard phase with a greater toughness than said hard phase and a hardness less than said hard phase.
In combination
- a metal substrate;
- and
- a wear layer metallurgically bonded on said substrate, said layer including a matrix and a plurality of hard phase particles in said matrix, said matrix having a greater toughness than said hard phase particles and a hardness less than said particles, said particles having a hardness greater than 1900 HV in at least 80% of said hard phase particles, at least some of said hard phase particles projecting from said matrix with a chord length of from 30 to 200 micron.
Dependencies are inferred from the claim text.