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Lead-free corrosion-resistant free-cutting brass alloy and preparation method thereof

The technology of a brass alloy and a manufacturing method, which is applied in the field of metal material manufacturing, can solve the problems of high cost and complicated process, and achieve the effects of excellent cutting performance and excellent corrosion resistance.

Inactive Publication Date: 2017-07-14
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these lead-free brass may be limited to some scarce resources, or complex processes, high costs and other factors, and cannot be mass-produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Selection of raw materials: pure copper, Cu-Zn master alloy, Cu-Si master alloy, Cu-Mn master alloy, Cu-Bi master alloy, Cu-RE master alloy are used as raw materials, and these raw materials are directly purchased from the market; among them, Cu The mass fraction of Zn in the Zn master alloy is 50%, the mass fraction of Si in the Cu-Si master alloy is 20%, the mass fraction of Mn in the Cu-Mn master alloy is 20%, and the mass fraction of Bi in the Cu-Bi master alloy is 20%. , The mass fraction of RE in the Cu-RE master alloy is 10%;

[0024] Ingredients: 50g Cu-Si master alloy, 56g Cu-Mn master alloy, 25g Cu-Bi master alloy, 5g Cu-RE master alloy, 600g Cu-Zn master alloy, 420g pure copper;

[0025] The process of melting, casting and thermal processing is as follows: first put Cu-Mn master alloy, Cu-Si master alloy, and pure copper into the furnace and heat them to 1200°C to melt them, then put flake graphite with a thickness of 0.5cm as a covering agent, and then Add ...

Embodiment 2

[0029] Selection of raw materials: pure copper, Cu-Zn master alloy, Cu-Si master alloy, Cu-Mn master alloy, Cu-Bi master alloy, Cu-RE master alloy are used as raw materials, and these raw materials are directly purchased from the market; among them, Cu The mass fraction of Zn in the Zn master alloy is 50%, the mass fraction of Si in the Cu-Si master alloy is 20%, the mass fraction of Mn in the Cu-Mn master alloy is 20%, and the mass fraction of Bi in the Cu-Bi master alloy is 20%. , The mass fraction of RE in the Cu-RE master alloy is 10%;

[0030] Ingredients: 80g Cu-Si master alloy, 66g Cu-Mn master alloy, 50g Cu-Bi master alloy, 10g Cu-RE master alloy, 650g Cu-Zn master alloy, 265g pure copper;

[0031] The process of melting, casting and thermal processing is as follows: first put Cu-Mn master alloy, Cu-Si master alloy, and pure copper into the furnace and heat them to 1200°C to melt them, then put flake graphite with a thickness of 0.5cm as a covering agent, and then Add...

Embodiment 3

[0035] Selection of raw materials: pure copper, Cu-Zn master alloy, Cu-Si master alloy, Cu-Mn master alloy, Cu-Bi master alloy, Cu-RE master alloy are used as raw materials, and these raw materials are directly purchased from the market; among them, Cu The mass fraction of Zn in the Zn master alloy is 50%, the mass fraction of Si in the Cu-Si master alloy is 20%, the mass fraction of Mn in the Cu-Mn master alloy is 20%, and the mass fraction of Bi in the Cu-Bi master alloy is 20%. , The mass fraction of RE in the Cu-RE master alloy is 10%;

[0036] Ingredients: 150g Cu-Si master alloy, 96g Cu-Mn master alloy, 85g Cu-Bi master alloy, 15g Cu-RE master alloy, 700g Cu-Zn master alloy, 110g pure copper;

[0037] The process of melting, casting and thermal processing is as follows: first put Cu-Mn master alloy, Cu-Si master alloy, and pure copper into the furnace and heat them to 1200°C to melt them, then put flake graphite with a thickness of 0.5cm as a covering agent, and then Add ...

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Abstract

The invention discloses a lead-free corrosion-resistant free-cutting brass alloy. The lead-free corrosion-resistant free-cutting brass alloy is prepared from the following raw materials in percentage by weight: 30-38% of zinc, 0.2-3.5% of bismuth, 1.5-2.5% of manganese, 1.5-3.5% of silicon, 0.1-0.4% of rare-earth element, less than or equal to 0.1% of impurities, and the balance copper. A preparation method for the lead-free corrosion-resistant free-cutting brass alloy comprises the following steps of: selecting raw materials, batching, smelting, continuously extruding and extruding or continuously casting and rolling. The prepared brass alloy has relatively high hardness (microhardness being 150-155HV), and common lead brass has hardness of 110-150 HV; the prepared brass alloy has tensile strength greater than 500 MPa and ductility greater than 20%. The prepared brass alloy disclosed by the invention has a chip shape and a size which are similar with those of conventional lead brass, and has excellent cutting performance. According to the prepared brass alloy disclosed by the invention, the thickness (100-160 [mu]m), which is far lower than that (350-400 [mu]m) of a dezincification layer of lead brass, of the dezincification layer of the alloy prepared in a dezincification corrosion test.

Description

technical field [0001] The invention belongs to the field of metal material production, and in particular relates to a lead-free, corrosion-resistant, easy-cutting brass alloy and a production method thereof. Background technique [0002] Lead brass has good corrosion resistance, excellent cutting performance and processing performance, and more importantly, its price is much cheaper than ordinary copper alloys, the cost is low, and the production process is simple. Therefore, lead brass has long been the most economical and practical alloy and has been widely used in electronic appliances, home appliances, drinking water devices, aerospace, machinery, automobiles, instruments, hardware and other fields. Lead hardly dissolves in the brass alloy, and mainly exists as an independent phase at the grain boundary of the Cu-Zn solid solution. A large number of free lead particles are dispersed in the brass matrix, and the lead is soft, which will melt during the processing and pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22C1/03C22F1/08
CPCC22C9/04C22C1/03C22F1/08
Inventor 秦永强吴玉程黄新民舒霞王岩崔接武张勇
Owner HEFEI UNIV OF TECH