Composite piston material and preparation method thereof

Abstract

The invention discloses a composite piston material. The composite piston material comprises the following raw materials including, by weight, 6.5-7.5 parts of silicon powder, 0.3-0.5 part of magnesium powder, 0.06-0.10 part of titanium powder, 0.1-0.2 part of yttrium powder, 6-7 parts of silicon carbide powder, 2-3 parts of molybdenum disulfide, 0.2-0.5 part of hafnium powder and 85-100 parts ofaluminum powder. The invention further discloses a preparation method of the composite piston material. The preparation method includes the following steps that (1) the raw materials are weighed; (2)the silicon powder, the magnesium powder, the titanium powder, the yttrium powder, the hafnium powder and the aluminum powder are ball-milled, sieved and mixed; (3) the silicon carbide powder is heated and kept warm to fully react with oxygen, and then silicon dioxide is formed on the surface layer; and (4) a mixed raw material is heated, degassed, kept warm and then cooled, then the molybdenum disulfide and the silicon carbide are added, stirring is performed, and the composite piston material is obtained. According to the composite piston material and the preparation method thereof, alloy elements which have large influences on the high temperature property and the abrasion resistance are added according to a certain proportion to adjust the matching ratio, so that the high temperature strength and the abrasion resistance of the material are improved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a 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 high power, high loa...

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