High-silicon aluminum alloy cylinder sleeve material and fabrication method thereof

Abstract

The invention relates to a high-silicon aluminum alloy cylinder sleeve material, which is characterized by comprising the following components by weight percent: 18.0-26.0 percent of Si, 2.0-5.0 percent of Fe, 3.0-7.0 percent of Ni, 1.8-3.0 percent of Cu, 0.5-0.8 percent of Mg, 0.5-0.8 percent of Mn, 0.1-0.3 percent of V and the balance of Al, wherein the amount of Fe and Ni is larger than or equal to 7 percent and less than or equal to 10 percent, and the amount of Fe, Ni and Si is larger than or equal to 27 percent and less than or equal to 33 percent. The high-silicon aluminum alloy cylinder sleeve material and products, which are prepared by the invention, are high in technological property, mechanical property and tribological property; such functions of a hard-spot phase of the cylinder sleeve working face, as bearing, abrasion resistance, oil storage in peripheral concave pits, cooling and lubrication, are prominent to the utmost; and size of particles in the cylinder sleeve and working face tribological shape size are effectively controlled, so that the use effect is better.

Description

technical field [0001] The invention relates to the technical field of metal alloys and their preparation, in particular to a high-silicon aluminum alloy cylinder liner material with good wear resistance and low expansion coefficient and a preparation method thereof. Background technique [0002] Cylinder clearance is an important parameter that determines and affects engine power density, exhaust gas pressure, fuel consumption and environmental emission indicators. Cast iron and steel cylinder liner materials have poor thermophysical compatibility with aluminum alloy piston materials, making it difficult to reduce the cylinder clearance. The high-silicon aluminum alloy cylinder liner material has similar thermophysical properties to the aluminum alloy piston material and aluminum alloy cylinder head, which can significantly reduce the cylinder matching gap and avoid or overcome the disadvantage of poor compatibility. [0003] The tribological mechanism of high-silicon alum...

AI Technical Summary

Problems solved by technology

This type of high-silicon aluminum alloy is brittle, and its mechanical properties at high temperature and room temperature are seriously too low. Moreover, these patents all use powder metallurgy technology, which has high manufacturing costs, complicated processes, and poor performance uniformity of the products.

[0004] The high-silicon aluminum alloys disclosed in Chinese patent applications with application numbers 00124660.7 and 200510048662.7 are manufactured by spray deposition. The prepared alloy has good tribological and mechanical properties, but the material is brittle and has insufficient mechanical properties at room temperature and high temperature.

[0005] The high-silicon aluminum alloy cylinder liner material and preparation method disclosed in the Chinese patent application with the notification number 101457318A has a high iron content, which leads to excessive needle-shaped and rod-shaped iron phases in the structure, which not only affects the performance of the material and products, but also brings Difficulty in cylinder liner forming process

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