Lanthanum-containing composite piston material, and preparation method thereof

Abstract

The invention discloses a lanthanum-containing composite piston material comprising, by weight, 10-13 parts of silicon powder, 1-2 parts of magnesium powder, 0.1-0.2 part of lanthanum powder, 5.2-5.8parts of silicon carbide powder, 1.2-1.8 parts of molybdenum disulfide, 0.15-0.18 part of hafnium powder and 74-84 parts of aluminum powder. The invention further discloses a preparation method of thelanthanum-containing composite piston material. The preparation method comprises the step (1) of weighing raw materials; the step (2) of ball-milling, sieving and mixing the silicon powder, the magnesium disulfide, the lanthanum powder, the hafnium powder and the aluminum powder; the step (3) of heating the silicon carbide powder and holding the temperature, and forming silicon dioxide on the surface layer after the silicon carbide powder reacts with oxygen fully; and the step (4) of heating and degassing the mixed materials, holding the temperature and cooling the mixed materials again, thenadding the molybdenum disulfide and the silicon carbide to the mixed materials, and stirring the mixtures so that the lanthanum-containing composite piston material is obtained. According to the lanthanum-containing composite piston material and the preparation method thereof, by adding alloy elements with great influence on high-temperature performance and wear resistance proportionally and adjusting the proportion, the high-temperature strength and wear resistance of the materials are improved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a lanthanum-containing composite piston material and a preparation method thereof. Background technique [0002] The piston is called the heart of the engine. It bears continuous alternating mechanical loads and thermal loads during the working process of the engine. It is a key part of the engine with the worst working conditions. Since the piston works under the condition of high temperature, high pressure and high speed, the material used for the piston must have high high temperature strength and good wear resistance to maintain the stable working efficiency of the engine. [0003] The main piston materials currently used are high temperature resistant aluminum alloys, cast iron and cast steel materials. Among them, high temperature resistant aluminum alloy is the most widely used. However, with the development of trucks, railway locomotives and marine engines towards...

AI Technical Summary

Problems solved by technology

However, with the development of trucks, railway locomotives and marine engines towards high power, high load and strict emission requirements, the existing high temperature resistant aluminum alloys have become more and more difficult to meet the needs

However, the density of cast iron and cast steel is too high to meet the comprehensive performance requirements of modern high-efficiency engines for pistons