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Multielement additive for preparing unleaded free-cutting brass and preparation method and application thereof

An additive, easy-cutting technology, applied in the field of new materials, can solve the problems of increasing process complexity and production cost, easy burning, and serious cutting performance, so as to reduce production costs, simplify process operations, and reduce burning rate. Effect

Inactive Publication Date: 2011-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These low melting point or chemically active elements are easy to burn out during the smelting process, often due to the severe burning of these elements, they fail to show the effect of improving the cutting performance, thus increasing the complexity of the process and production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of a multi-element additive for preparing lead-free free-cutting brass

[0025] According to the batching plan of bismuth (5-22%), tin (3-10%), cerium-rich rare earth (0.5-5%), phosphorus (0.5-2.5%), and the balance is copper, it is prepared by vacuum melting technology. The temperature is 1150-1250°C. During smelting, electrolytic copper is added first, and after melting, bismuth, tin, phosphorus and rare earth are added to the brass melt by encapsulation with pure copper tubes. The burning loss rate of each element in the additive is shown in Table 1 after chemical composition detection. It can be seen that, during the preparation process of the additive, the burning loss rate of each element is relatively low, all less than 10%.

[0026] Table 1 The burning loss rate of each element in the multi-element additive

[0027] alloy element

Embodiment 2

[0029] Application of multiple additives in lead-free brass

[0030] The multi-component additive of the present invention is applied to the brass melt, and the composition and content of the additive are: bismuth 5-22%; tin 3-10%; cerium-rich rare earth 0.5-5%; phosphorus 0.5-2.5%; The balance is copper. In addition, there are unavoidable impurities, and the impurity content is ≤0.05%. The weight ratio of Cu and Zn in the brass melt before adding additives is 1.1-1.6. The amount of additive added is 20-70g / kg melt. Melting and casting process sequence: covering agent (charcoal)-copper-zinc-multiple additives-solvent (cryolite)-slag removal-fire-spraying-iron mold casting. The properties of the lead-free brass alloy obtained by adding additives to the brass melt and directly adding various alloying elements are shown in Table 2. Among them, the machinability of HPb59-1 brass is Sex is rated at 100%. It can be seen from Table 2 that compared with directly adding various al...

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Abstract

The invention relates to a multielement additive for preparing unleaded free-cutting brass and a preparation method and application thereof. The additive contains the following components in mass percent: 65-75% of copper (Cu), 5-22% of bismuth (Bi), 3-10% of tin (Sn), 0.5-5% of cerium (Ce) rich rare earth, 0.5-2.5% of phosphorus (P), and less than or equal to 0.05% of impurities. The additive isprepared by a vacuum melting method, and when the additive is applied to preparing the unleaded brass, the addition is only 20-70g / kg fusant. In the invention, appropriate alloy elements and contentsthereof are selected to substitute Pb which is harmful to the human body to improve the cutting property of the brass, and the elements are added to the brass fusant in a multielement additive form, thereby reducing the burn out rate of the alloy elements, and simplifying the melting process. Brass prepared by the additive has low production cost, excellent cutting property, excellent mechanical property, excellent processing property and excellent corrosion-resisting property; and the products completely meet the international requirements of environment protection, health and safety standards.

Description

technical field [0001] The invention belongs to the field of new materials. The invention relates to a multi-element additive for preparing lead-free free-cutting brass, its preparation method and application. Background technique [0002] With its easy cutting and excellent physical, chemical and mechanical properties, brass has become a widely used material for various parts in the manufacturing industry. In order to improve the cutting performance of brass alloys during machining, generally 1-3% lead (Pb) is added to brass. Lead is an element harmful to the environment and the human body. It neither dissolves in copper nor forms an intermetallic compound with copper. Under the action of impurities in drinking water and organic acids, lead in lead-containing copper alloys will Slow precipitation, so its application is increasingly restricted. Since August 6, 1998, the United States has required the leaching of lead in the drinking water supply system to be within 1.1×10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/03C22C9/04
Inventor 林高用曾菊花孙利平邹艳明刘健周玉雄
Owner CENT SOUTH UNIV
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