Low-temperature superhigh-toughness wear-resistant copper alloy and preparing method thereof

Abstract

The invention relates to low-temperature superhigh-toughness wear-resistant copper alloy and a preparing method thereof and belongs to the technical fields of metal materials and preparation. The copper alloy consists of the following components in a percent by mass: 25.0-45.0% of nickel, 2-15% of manganese, 1-8% of zinc, 0.1-5.0% of titanium, 0.5-5% of iron, 0.1-3% of chromium and the balance of copper. The preparing method comprises the following preparing steps: preparing materials, carrying out casting, carrying out hot extrusion, carrying out hot forging and obtaining a finished product. The low-temperature comprehensive mechanical properties and the wear resistance of the alloy are improved by adding the elements, such as the manganese, the zinc, the titanium, the iron and the chromium, and at the same time, the alloy is ensured to have great processability. The impact energy of the prepared copper alloy material at the low temperature of -196 DEG C is larger than 170J and is 3-5 times of other common wear-resistant copper alloy materials. The copper alloy material is particularly suitable for manufacturing wear-resistant parts used in low-temperature environments in the fields of aviation, aerospace and the like.

Description

technical field [0001] The invention relates to a low-temperature ultra-high toughness wear-resistant copper alloy and a preparation method thereof, in particular to a wear-resistant copper alloy with ultra-high impact energy at a low temperature of -196°C and a preparation method thereof, belonging to metal materials and their preparation technology field. Background technique [0002] Wear-resistant copper alloy materials are used to make gears, bearing bushes, sealing rings, hydraulic pump friction pairs, etc., and are widely used in aerospace, military, petrochemical, transportation and other fields. There has been a long history of research on wear-resistant copper alloys used at room temperature at home and abroad, and a series of industrial products such as complex brass, tin bronze, and aluminum bronze have been formed. [0003] With the rapid development of modern aerospace and other fields, higher and higher requirements are put forward for the comprehensive mecha...

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Problems solved by technology

[0004] However, according to foreign data and our recent research, although some wear-resistant copper alloys have good toughness at room temperature, their impact toughness is poor at -196°C

For example, after the wear-resistant tin bronze is cold-worked, the room temperature impact energy A kv2 It can reach 100J, but the impact energy decreases to less than 45J at -196°C; the wear-resistant aluminum bronze alloy with high strength and high hardness has a good wear resistance at room temperature due to the brittle phase of the lamellar structure, but it increases when used at low temperature. The brittleness of the material is improved, and its impact energy is reduced to less than 30J at -196°C; the impact energy of wear-resistant complex brass at -196°C is A kv2 The value is also less than 35J

According to reports in foreign books and materials, the low-temperature impact energy A of copper-nickel alloys kv2 The value can reach up to 100J, but domestic reports on low-temperature impact toughness of copper-nickel alloys have not yet been published.