CN103757472B - A kind of containing cerium cutting brass alloy material and preparation method thereof - Google Patents

Abstract

A cerium-containing free-cutting brass alloy material, which contains chemical elements and mass percentages: beryllium 0.03-0.05, manganese 0.12-0.16, tin 2.5-2.9, nickel 4.7-4.9, aluminum 3.1-3.3, cerium 0.05 -0.09, Zinc 23.5-23.9, V0.9-1.2, Ta0.04-0.06, the balance is copper. The alloy of the invention contains cerium and manganese, has good cutting performance, does not weaken the conductive effect, has excellent cold and hot processing performance and casting performance, and has good polishing performance and welding performance. The refining agent of the present invention is used in casting production, which can reduce the porosity in the casting by 1-2 degrees, and the oxidized inclusions are at about 2 levels, so that the yield of finished products can be obviously improved.

Description

A kind of cerium-containing free-cutting brass alloy material and preparation method thereof

technical field

The invention relates to the field of manufacturing metal alloy materials, in particular to a free-cutting brass alloy material containing cerium and a preparation method thereof.

Background technique

Copper is widely used because of its good electrical conductivity, plasticity and corrosion resistance. Adding elements such as aluminum, nickel, manganese, tin, silicon, and lead to copper alloy can improve the performance of copper and be used in different places. At present, there are still some problems in the existing copper alloys in my country, such as the alloy contains a large number of impurity elements, poor high temperature fatigue, low high temperature strength; low hardness, poor wear resistance, large friction coefficient, short service life; poor conductivity, waste of electric energy; bending The processing performance is poor and it is easy to break; the quality is heavy and the construction is difficult; it cannot meet the market requirements.

Contents of the invention

The object of the present invention is to provide a free-cutting brass alloy material containing cerium and a preparation method thereof. The copper alloy material has the advantages of easy cutting and good processing performance.

Technical scheme of the present invention is as follows:

A cerium-containing free-cutting brass alloy material, characterized in that: the chemical element composition and its mass percentage are: beryllium 0.03-0.05, manganese 0.12-0.16, tin 2.5-2.9, nickel 4.7-4.9, aluminum 3.1- 3.3, Ce 0.05-0.09, Zinc 23.5-23.9, V0.9-1.2, Ta0.04-0.06, the balance is copper.

The production method of the described cerium-containing free-cutting brass alloy material is characterized in that:

(1) Prepare pure copper and scrap copper at a ratio of 1:1-2 as the source of copper matrix, add pure copper into the furnace for melting, remove impurities, deoxidize, use refining agent for one-time refining, and add alloy components for alloying, Then add scrap copper for melting, add refining agent for secondary refining, test and adjust the content of chemical elements to pass, casting, post-casting heat treatment, etc.;

(2) The order of batches of alloying elements put into the furnace during the alloying process is: (1) Zinc; (2) Nickel, Manganese, Aluminum; (3) Beryllium, Ta; (4) Other remaining ingredients; each batch The time interval for adding elements is 22-25 minutes, and stir evenly after feeding.

The post-casting heat treatment is as follows: firstly, the temperature is raised from room temperature to 360-370°C at a rate of 240-250°C/hour, then cooled to 290-300°C at a rate of 250-260°C/hour, and then heated at a rate of 240-250°C/hour Raise the temperature to 560-570°C and keep it for 1-2 hours; then cool down to 100-120°C at a rate of 250-260°C/hour and keep it for 1-2 hours; then raise the temperature to 360-380 at a rate of 240-250°C/hour ℃, keep warm for 1-2 hours; then cool down to 100-120°C at a rate of 250-260°C/hour, keep warm for 1-2 hours; then heat up to 310-330°C at a rate of 200-210°C/hour, keep warm for 2-3 hours, take out and air cool.

The refining agent is made of the following raw materials in parts by weight: calcium carbonate powder 4-5, bauxite 2.1-2.5, tree ash 1-2, nano silicon dioxide 1-2, alum 2-3, jade powder 3 -4, calcium carbide powder 4-5, potassium fluotitanate 2-3, sodium tetraborate 1-2, Bi ₂ O ₃ 2-3; the preparation method is to mix calcium carbonate powder, bauxite, tree ash, nanometer di Mix silicon oxide, alum, jade powder, and calcium carbide powder, heat to 2600-3000°C, stir for 1-2 hours, after cooling, add to 10-15% hydrochloric acid solution, soak for 1-2 hours, filter, and use the filter residue repeatedly Wash it with water, dry it, and mix it with other ingredients evenly.

Beneficial effects of the present invention

The alloy of the invention contains cerium and manganese, has good cutting performance, does not weaken the conductive effect, has excellent cold and hot processing performance and casting performance, and has good polishing performance and welding performance. The refining agent of the present invention is used in casting production, which can reduce the porosity in the casting by 1-2 degrees, and the oxidized inclusions are at about 2 levels, so that the yield of finished products can be obviously improved.

detailed description

A cerium-containing free-cutting brass alloy material, which contains chemical elements and mass percentages: beryllium 0.03-0.05, manganese 0.12-0.16, tin 2.5-2.9, nickel 4.7-4.9, aluminum 3.1-3.3, cerium 0.05 -0.09, Zinc 23.5-23.9, V0.9-1.2, Ta0.04-0.06, the balance is copper.

The production method of described cerium-containing free-cutting brass alloy material is as follows:

(1) Prepare pure copper and scrap copper as the source of copper matrix in a ratio of 1:1.5, add pure copper into the furnace to melt, remove impurities, deoxidize, refine with a refining agent, add alloy components for alloying, and then add Scrap copper melting, adding refining agent for secondary refining, testing and adjusting the content of chemical elements to pass, casting, post-casting heat treatment, etc.;

(2) The order of batches of alloying elements put into the furnace during the alloying process is: (1) Zinc; (2) Nickel, Manganese, Aluminum; (3) Beryllium, Ta; (4) Other remaining ingredients; each batch The time interval between adding elements is 24 minutes, and stir evenly after feeding.

The post-casting heat treatment is as follows: firstly, the temperature is raised from room temperature to 365°C at a rate of 245°C/hour, then cooled to 295°C at a rate of 255°C/hour, then raised to 565°C at a rate of 245°C/hour, and kept for 1.5 hours; Then cool down to 110°C at a rate of 255°C/hour and keep warm for 1.5 hours; then raise the temperature to 370°C at a rate of 245°C/hour and keep warm for 1.5 hours; then cool down to 110°C at a rate of 255°C/hour and keep warm for 1.5 hours; Raise the temperature at a rate of 205°C/hour to 320°C, keep it warm for 2.5 hours, take it out and cool it in air.

The refining agent is made of the following raw materials in parts by weight (kg): calcium carbonate powder 5, bauxite 2.1, tree ash 1, nano silicon dioxide 2, alum 2, jade powder 4, calcium carbide powder 4, fluorine titanium Potassium tetraborate 3, sodium tetraborate 2, Bi ₂ O ₃ 2; the preparation method is to mix calcium carbonate powder, bauxite, tree ash, nano silicon dioxide, alum, jade powder, calcium carbide powder, and heat to 2600-3000 ℃, stir for 1-2 hours, after cooling, add to 10-15% hydrochloric acid solution, soak for 1-2 hours, filter, wash the filter residue with water repeatedly, dry, combine with other ingredients and mix evenly.

The free-cutting brass alloy material containing cerium in this example has a tensile strength бb of 478 MPa, a yield strength of 430 MPa, a hardness value of HB of 134, a conductivity of %IACS68, a softening temperature of 599°C, and an elongation of 16.7% at 20°C.

Claims (3)

1. A cerium-containing free-cutting brass alloy material, characterized in that: the chemical element composition and mass percentages thereof are: beryllium 0.03-0.05, manganese 0.12-0.16, tin 2.5-2.9, nickel 4.7-4.9, aluminum 3.1-3.3, cerium 0.05-0.09, zinc 23.5-23.9, V0.9-1.2, Ta0.04-0.06, the balance is copper. 2. the production method of cerium-containing free-cutting brass alloy material according to claim 1, is characterized in that: (1) Prepare pure copper and scrap copper at a ratio of 1:1-2 as the source of copper matrix, add pure copper into the furnace for melting, remove impurities, deoxidize, use refining agent for one-time refining, and add alloy components for alloying, Then add scrap copper to melt, add refining agent for secondary refining, test and adjust the content of chemical elements to pass, casting, post-casting heat treatment; (2) The order of batches of alloying elements put into the furnace during the alloying process is: (1) Zinc; (2) Nickel, Manganese, Aluminum; (3) Beryllium, Ta; (4) Other remaining ingredients; each batch The time interval for adding elements is 22-25 minutes, and stir evenly after feeding; The post-casting heat treatment is as follows: firstly, the temperature is raised from room temperature to 360-370°C at a rate of 240-250°C/hour, then cooled to 290-300°C at a rate of 250-260°C/hour, and then heated at a rate of 240-250°C/hour Raise the temperature to 560-570°C and keep it for 1-2 hours; then cool down to 100-120°C at a rate of 250-260°C/hour and keep it for 1-2 hours; then raise the temperature to 360-380 at a rate of 240-250°C/hour ℃, keep warm for 1-2 hours; then cool down to 100-120°C at a rate of 250-260°C/hour, keep warm for 1-2 hours; then heat up to 310-330°C at a rate of 200-210°C/hour, keep warm for 2-3 hours, take out and air cool. 3. the production method of cerium-containing free-cutting brass alloy material according to claim 2, is characterized in that: described refining agent is made by the raw material of following weight part: calcium carbonate powder 4-5, bauxite 2.1 -2.5, tree ash 1-2, nano silicon dioxide 1-2, alum 2-3, jade powder 3-4, calcium carbide powder 4-5, potassium fluotitanate 2-3, sodium tetraborate 1-2, Bi2O32 -3; Its preparation method is to mix calcium carbonate powder, bauxite, tree ash, nano silicon dioxide, alum, jade powder and calcium carbide powder, heat to 2600-3000 ° C, stir for 1-2 hours, after cooling, add to 10- Soak in 15% hydrochloric acid solution for 1-2 hours, filter, wash the filter residue with water repeatedly, dry, combine with other ingredients and mix evenly.