Piston material containing cobalt and preparation method thereof

Abstract

The invention discloses a piston material containing cobalt, and further discloses a preparation method of the piston material containing cobalt. The piston material containing cobalt comprises the following raw materials of, by weight, 160-200 parts of aluminum powder, 20-30 parts of silica powder, 2-4 parts of magnesium powder, 2-4 parts of copper powder, 2-4 parts of hafnium powder, 3-5 parts of nickel, 3-5 parts of chrome and 3-5 parts of cobalt. The preparation method of the piston material containing cobalt comprises the following steps that the raw materials of the piston material are weighed correspondingly by weight; the raw materials of the piston material are subjected to ball-milling, pass through a screening net after ball-milling is conducted, and are mixed, and a mixed raw material is obtained; the mixed raw material is poured into a mold, the mold is placed in a vacuum environment for high-temperature smelting, and after cooling is conducted, the piston material containing cobalt is obtained. The piston material containing cobalt and the preparation method thereof have the advantages that alloy elements which have a greater influence on high-temperature performanceare added according to a certain proportion to adjust the proportion, so that the high-temperature strength and the high-temperature thermal stability of the material are improved, and finally the piston material containing cobalt is obtained, wherein the piston material has high-temperature tensile resistance, thermal corrosion resistance, fatigue resistance and abrasion resistance.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a cobalt-containing piston material and a preparation method thereof. Background technique [0002] In order to reduce energy consumption, reduce air pollution, and improve the efficiency of internal combustion engines, increasing the combustion temperature has become an important development trend of internal combustion engines. Correspondingly, higher requirements are put forward for the high temperature strength and high temperature wear resistance of internal combustion engine accessories. [0003] At present, aluminum ingots, one of the main raw materials of domestic piston manufacturers, are mostly eutectic aluminum-silicon ZL108 or ZL109. The mechanical properties and casting flow properties of this material meet the general needs, but its high-temperature strength is low: at a high temperature of 300°C , the tensile strength is only 69-85MPa, and the volume stabilit...

AI Technical Summary

Problems solved by technology

[0003] At present, aluminum ingots, one of the main raw materials of domestic piston manufacturers, are mostly eutectic aluminum-silicon ZL108 or ZL109. The mechanical properties and casting flow properties of this material meet the general needs, but its high-temperature strength is low: at a high temperature of 300°C , the tensile strength is only 69-85MPa, and the volume stability is as high as 0.028%. This material has already begun to show its inability to face the increasingly demanding high-load, high-explosion and low-pollution engines.