Preparation method for wear-resisting layer embedded at top of diesel engine piston

Abstract

The invention relates to a preparation method for a wear-resisting layer embedded at the top of a diesel engine piston. The preparation method is characterized in that kaolin is adopted as the main raw material, and raw materials such as nanometer zirconium oxide and silicon nitride are added; the production technology is scientific; the manufacturing is convenient; the production cycle is short; the production cost is low; the method is eco-friendly and environment-friendly; the wear-resisting layer at the top of the piston can effectively preventing the influence of high temperature of a combustion chamber on a copper nickel magnesium aluminum alloy piston body; the coefficient of thermal expansion is close to zero; the wear-resisting layer does not absorb water; the insulating property is good; the structure is compact and uniform; the impact resistance and corrosion resistance are good; the compressive strength is high; the shrinkage rate is small; the wear-resisting layer is high temperature resistant and wear resisting, and does not crack; the Mohs hardness of the wear-resisting layer reaches 8.2; the service life is long; the comprehensive performance is excellent; and large-batch industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of diesel engine processing, and in particular relates to a preparation method for inlaying a wear-resistant layer on the top of a diesel engine piston. Background technique [0002] The advantages of a diesel engine are high power and good economic performance. The working process of a diesel engine is four strokes of intake, compression, work, and exhaust. When working, the air enters the cylinder, and the piston moves up and down in the cylinder. The air is compressed to At the limit, the temperature can reach 500-700°C and the pressure can reach 40-50 atmospheres. When the piston is close to the top dead center, the high-pressure pump on the engine injects diesel into the cylinder at high pressure through the injector, and the diesel forms fine oil particles. , expands violently in a high-pressure and high-temperature environment, generates explosive force, and pushes the piston down to do work. At this ...

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Problems solved by technology

[0002] The advantages of a diesel engine are high power and good economic performance. The working process of a diesel engine is four strokes of intake, compression, work, and exhaust. When working, the air enters the cylinder, and the piston moves up and down in the cylinder. The air is compressed to At the limit, the temperature can reach 500-700°C and the pressure can reach 40-50 atmospheres. When the piston is close to the top dead center, the high-pressure pump on the engine injects diesel into the cylinder at high pressure through the injector, and the diesel forms fine oil particles. , expands violently in a high-pressure and high-temperature environment, generates explosive force, and pushes the piston down to do work. At this time, the temperature can reach above 1000°C, the pressure can reach 60-100 atmospheres, and the power generated is very large, so diesel engines are widely used in In large diesel vehicles, the mixture in the diesel engine cylinder is compression-ignited instead of ignited. In the actual working process, due to long-term work, high temperature will cause cracks on the top of the piston, and in severe cases, it will cause ring bank fracture. At present, some manufacturers use the high temperature resistance of ceramic materials to manufacture ceramic layers on the top of the piston. However, due to the brittleness of ceramic materials, assembly and use strength, there are difficulties in the production and use of ceramic internal combustion engines. The processing is difficult and reliable. Performance and stability are difficult to guarantee

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