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Lead-free bronze alloy and application thereof

A lead-free bronze and alloy technology, applied in the application field of drinking water system castings, can solve problems such as poor casting performance and application limitations, improve casting performance and mechanical properties, prevent segregation or reverse segregation, and resist seawater corrosion The effect of ability improvement

Active Publication Date: 2014-06-25
安新县华昌合金厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing low-lead or lead-free bronze alloys are generally poor in casting properties such as low-pressure casting and gravity casting, and cannot meet the requirements of some key production processes, thereby greatly restricting their applications.

Method used

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  • Lead-free bronze alloy and application thereof
  • Lead-free bronze alloy and application thereof
  • Lead-free bronze alloy and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one: product and preparation method

[0037] The manufacturing method of lead-free environment-friendly bronze alloy includes the following steps:

[0038] Copper+charcoal→melting→adding zinc, bismuth, tin→stirring→deoxidation→stirring→refining→mixing rare earth additives→stirring→sampling analysis→adjusting composition→removing slag→standstill→casting out of the furnace, specifically:

[0039] The first step is to heat the induction furnace, add electrolytic copper to cover the charcoal, and heat up to fully melt the copper.

[0040] In the second step, add 0# zinc, refined bismuth and refined tin at a furnace temperature of 1150°C and stir.

[0041] The third step, add CuP 14 Phosphor copper deoxidizer stirring.

[0042] Step 4: adding refining agent, the composition percentage of refining agent is: 50% of fluorite, 20% of cryolite, 10% of borax, and 20% of copper oxide.

[0043] The fifth step is to add mixed rare earths, which contain 80%-90% of lanth...

Embodiment 2

[0054]Embodiment two: casting performance test

[0055] The casting properties of the lead-free bronze alloy products 1, 2, 3 and ZQSn5-5-5 bronze are compared, product 1, no mixed rare earths are added, the casting performance is not improved, and the casting performance of product 2 is not improved by adding 0.001% of the mixed rare earths Significantly improved, the casting performance of products 1 and 2 has no obvious difference from ZQSn5-5-5 alloy, the addition of product 3 mixed rare earth is 0.03%, the castability can be significantly reduced, indicating that the excessive addition of mixed rare earth is harmful to casting performance, product 4-10 mixed The amount of rare earth added is in the range of 0.002%-0.02%, and its casting performance is significantly better than that of products 1, 2, 3, and ZQSn5-5-5 alloys. The production practice shows that due to the addition of an appropriate amount of mixed rare earths, the casting performance is significantly improved...

Embodiment 3

[0058] Embodiment three: Cutting performance test

[0059] The evaluation method of cutting performance: when turning on a general lathe, use a unified turning tool and turning method with a turning speed of 960r / min, a feed rate of 0.1mm / r, a cutting depth of 0.4mm, and a turning process with a rake angle of 4 degrees. Carry out the cutting performance test comparison of products 1, 2, 3, 4, 5, and the comparative example ZQSn5-5-5, collect 100 chips respectively, measure the average length of the chips, and use the average length of the chips of ZQSn5-5-5 Divide by the average chip length of products 1, 2, 3, 4, 5, and each sample as the evaluation index. The above experiments prove that the cutting performance of products 1 and 2 has not been improved, and the cutting performance of product 3 has declined instead. Due to the addition of appropriate amount of mixed rare earths in 4 and 5, the cutting performance of products 1, 2 and 3 is significantly better than that of pro...

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Abstract

The invention discloses a lead-free bronze alloy and an application thereof. The lead-free bronze alloy comprises the following chemical components by mass percent: 2.3-4.3 percent of stannum, 5.0-10.0 percent of zinc, 0.6-1.7 percent of bismuth, 0.002-0.02 percent of misch metal, equal to or less than 0.05 percent of lead, equal to or less than 0.25 percent of iron, equal to or less than 1.0 percent of nickel, equal to or less than 0.03 percent of phosphor, equal to or less than 0.002 percent of silicon, equal to or less than 0.002 percent of aluminum and the balance of copper, wherein the misch metal contains 80-90 percent of lanthanum, 5-8 percent of cerium, 4-10 percent of praseodymium and equal to or less than 1.0 percent of neodymium by mass percent. The alloy basically contains no lead, is harmless to human bodies and environments, is easily cut and suitable for low pressure casting and gravity casting, and has good erosion resistance; and the bronze alloy is suitable for casts of a drinking water system.

Description

technical field [0001] The invention relates to an alloy and its application, in particular to an easy-cutting, corrosion-resistant, lead-free, environment-friendly bronze alloy suitable for low-pressure casting and gravity casting and its application in drinking water system castings. Background technique [0002] Leaded bronze alloy is a copper alloy with stronger dezincification corrosion resistance than leaded brass alloy. It has a wide range of applications in the world. These fields involve machinery manufacturing, electrical instruments, architectural hardware, drinking water pipelines, etc. Leaded bronze alloy has many advantages, such as the brand ZQSn5-5-5 leaded tin bronze, which contains 4%-6% lead, 4%-6% tin and 4%-6% zinc, because of its high lead content, it has Good casting performance and cutting performance, and because of its low zinc content, it has strong resistance to dezincification corrosion. It can be used to cast thin-walled castings with complex sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04
Inventor 杨桂香杨景周杨景浩
Owner 安新县华昌合金厂
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