A kind of high-strength wear-resistant copper alloy and its preparation method

Abstract

The invention relates to a high-strength wear-resistant copper alloy which is characterized by being prepared from the following components in percentage by weight: 8.0-10.0% of nickel, 2.0-4.0% of tin, 1.5-3.5% of iron, 3.5-5.5% of aluminum, 0.03-0.2% of lanthanum and cerium compound rare earth, less than or equal to 0.1% of inevitable impurities and the balance of copper. The preparation method comprises the following steps: proportioning; casting; heating; extruding; annealing; and obtaining a finished product. According to the high-strength wear-resistant copper alloy provided by the invention, a principle of multiple elements in small amounts is adopted, so that the comprehensive mechanical property and wear resistance of the copper alloy are finally improved by virtue of adding elements such as nickel, tin, iron, aluminum and rare earth. Meanwhile, the good processing performance of the alloy is guaranteed. The alloy is a lead-free copper alloy material which is free from damage to the environment and a human body in production and use and has excellent cold and hot forming property, excellent mechanical property, good corrosion resistance and high strength and wear resistance. Furthermore, the copper alloy is simple in production process and easy to operate, and can be used for realizing large-scaled production. The copper alloy is especially suitable for wear-resistant parts such as cylinders, copper sleeves and bearing bushes under low-speed heavy-load work.

Description

technical field [0001] The invention relates to a copper alloy, in particular to a high-strength wear-resistant copper alloy and a preparation method thereof. Background technique [0002] High-performance hydraulic pumps / motors are key components of energy conversion in hydraulic systems, and are widely used in military, mining, metallurgy, engineering, agriculture, and injection molding machines. The advanced hydraulic technology is often used as a measure The standard of a country's industrial technology level. The key components of high-performance hydraulic pumps / motors in hydraulic systems, such as sliding shoes, cylinder blocks, copper sleeves, composite sintered copper parts, bearing bushes, ball joints, oil distribution plates, etc., are all high-strength and wear-resistant copper parts. The hydraulic pump / motor is the heart part of energy conversion in the hydraulic system, and the failure of the motor is mostly caused by wear, and the wear of the key friction pai...

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Problems solved by technology

[0004] Among the above patent achievements, CN100543160C patent pointed out that the alloy is used after casting and heat treatment, its strength is only about 300Mpa, and its plasticity is also low, which affects the service life; Alloying elements sometimes sacrifice the consideration of contributing to strength and hardness; although the cost of CN1092817A patent is lower, there are more alloying elements and slightly higher strength, but the plasticity at room temperature is lower, which reduces its wear life

At present, there are few researches on high-strength wear-resistant copper alloys in China. Some use the equal channel angle extrusion process. Although the strength and hardness of copper alloys are improved, the process is complicated and the requirements for mold making are high, so it is difficult to realize engineering applications.