Leadless brass alloy and preparation method thereof

Abstract

The invention discloses a leadless brass alloy and a preparation method thereof. The leadless brass alloy comprises the following components in percentage by weight: 59-65% of copper, 32-35% of zinc, 0.2-1% of silicon, 0.03-0.1% of phosphorus, 0.1-1% of magnesium, 0.02-0.1% of aluminum, 0.1-1% of nickel, 0.1-1% of tin and 0.0001-0.001% of lanthanum-cerium mixed rare earth element. The preparation method comprises the following steps: 1) alloy smelting: adding recovered brass, white copper and tin-phosphor bronze waste, adding a covering agent, and smelting at 1100-1200 DEG C; 2) alloy refining: after melting the raw materials, adding copper-silicon alloy, lanthanum-cerium mixed rare earth element (La+Ce) and aluminum, alloying and refining; 3) alloy degassing: adding copper-phosphorus alloy and magnesium, evenly stirring, adding zinc while keeping the temperature of the melt; and 4) alloy casting: casting the alloy at 1030-1080 DEG C. The preparation method adopts recovered copper alloy waste as well as cheap silicon, phosphorus and the like as the raw materials, so the alloy preparation cost is low.

Description

technical field [0001] The invention relates to a lead-free brass alloy and a preparation method thereof, in particular to a preparation method for preparing a lead-free brass alloy by using waste copper materials. Background technique [0002] The traditional brass alloy is a low melting point element represented by lead, which makes the alloy have excellent processing performance, high strength and plasticity. It is generally believed that the machinability of brass improves with the increase of lead, and is most effective at about 3% lead. Because lead brass has excellent cutting performance, it is widely used in various manufacturing industries, such as machinery, electronic appliances, construction and various parts of mechanical precision cutting processing, etc., but lead brass contains great harm to human body. The harmful heavy metal—lead, although its content is not high, has potential threats to human health. With the development of human science and technology ...

AI Technical Summary

Problems solved by technology

At present, the lead-free brass alloy patents developed at home and abroad mainly add elements such as tellurium, bismuth, antimony, etc. Lead-free brass containing bismuth, antimony and other elements has poor processing performance and low yield, and elements such as tellurium, bismuth and antimony are rare and precious elements, and resources are limited. Compared with leaded brass alloys, the production cost is high and very expensive. It is difficult to form an industrialized mass production to replace the lead brass widely used in the market

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