A kind of lead-free copper alloy for casting and preparation method thereof

A lead-copper alloy and alloy technology, which is applied in the field of lead-free copper alloy for casting and its preparation, can solve the problem that lead-free brass cannot meet the cost of bathroom faucets and valves, cutting performance, casting performance, corrosion resistance, mechanical properties, etc. Performance, casting molding performance, cutting performance, insufficient plasticity, and corrosion resistance decline, etc., to achieve a good market competitive advantage, increase dezincification corrosion resistance, and excellent cutting performance.

Active Publication Date: 2021-10-12
JOMOO KITCHEN & BATHROOM
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Problems solved by technology

[0003] At present, these lead-free materials have been applied in industry to a certain extent, but the copper content used in these materials is generally above 59wt%, or other more expensive elements are added, so that the cost of the final product is significantly higher than that of traditional leaded brass products
If the copper content in the copper alloy is simply reduced, such as reducing the copper content to below 55wt%, it will inevitably increase the zinc content in it, resulting in the material becoming hard and brittle, with insufficient casting performance, machinability, plasticity, and durability. Corrosion performance is severely degraded
[0004] In short, the existing lead-free brass cannot meet the various requirements of sanitary faucets and valves on cost, machining performance, casting performance, corrosion resistance, mechanical properties, etc.

Method used

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  • A kind of lead-free copper alloy for casting and preparation method thereof
  • A kind of lead-free copper alloy for casting and preparation method thereof
  • A kind of lead-free copper alloy for casting and preparation method thereof

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Embodiment Construction

[0038] The following specific examples further explain the present invention.

[0039] A method for preparing lead-free low-cost copper alloy for casting comprises the steps:

[0040] (1) Weigh the raw materials including Cu, Cu-Mn alloy, 0#Zn, Al, Fe, and metamorphic elements according to the composition of lead-free low-cost copper alloy for casting. According to the specific composition, the raw materials also include Si, Cu-P alloy , at least one of Pb, Bi, Mg; the modified element is at least one of B, Ti, Zr and rare earth elements;

[0041](2) Put Cu and Cu-Mn alloy on the bottom of the induction furnace, add slag cleaning agent to refine and cover with charcoal, heat up to 1050-1150°C until all materials are melted, and filter off the surface scum;

[0042] (3) Adjust the temperature to 1030-1080°C, add 0#Zn to the material obtained in step (2) and quickly press it into the bottom of the furnace, and stir fully after melting;

[0043] (4) in the material of step (3) ...

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Abstract

The invention discloses a lead-free copper alloy for casting, which comprises: 50-54wt% Cu, 18-23wt% Mn, 0.4-0.8wt% Al, 0.5-1.0wt% Fe, 0.001-0.2wt% modified element, the balance includes Zn and unavoidable impurities; wherein the modified element is at least one of B, Ti, Zr and rare earth elements. The invention also discloses a preparation method of the lead-free copper alloy for casting. The lead-free copper alloy for casting of the present invention meets the multi-dimensional comprehensive requirements of sanitary faucets and valves on cost, machining performance, casting performance, corrosion resistance, mechanical properties, etc., and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a lead-free copper alloy for casting and a preparation method thereof. Background technique [0002] Leaded brass is widely used in the production of faucet bodies, connecting fittings, valves and other products in the plumbing and sanitary industry. However, the lead in the brass in the drinking water system will leach out in the water, endangering human health. Therefore, all countries in the world have promulgated relevant laws and regulations to strictly limit and prohibit the use of lead brass. The key technology to research and develop lead-free brass is to use other elements to replace lead to solve the contradiction between brass cutting performance and usability. For example, the free cutting performance of lead-free brass can be improved by adding bismuth, silicon, antimony, magnesium, tellurium, etc. instead of lead. [0003] At present, these lead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/03C22C9/04
CPCC22C1/03C22C9/00C22C9/04
Inventor 林孝发林孝山周年润汪火良
Owner JOMOO KITCHEN & BATHROOM
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