CN102766777A - High-strength aluminum-brass-copper alloy and preparation method thereof - Google Patents

Abstract

The invention relates to a high-strength copper alloy material. The high-strength copper alloy material is characterized by comprising the following chemical components in percentage by mass: 61.0 to 65.0 percent of Cu, 5.0 to 7.0 percent of Al, 2.5 to 5.5 percent of Mn, 1.5 to 3.5 percent of Fe, 0.2 to 1.0 percent of Pb, less than or equal to 0.5 percent of Ni, less than or equal to 0.5 percent of Si, less than or equal to 0.2 percent of Sn and the balance of Zn. The high-strength copper alloy has good comprehensive mechanical properties.

Description

A kind of high-strength aluminium brass copper alloy and preparation method thereof

Technical field

The present invention relates to the Metal smelting technical field, a kind of specifically high strength copper alloy and method of manufacture thereof.

Background technology

Synchro converter ring is the automobile component that speed change is used in the automobile gearbox, and general select materials is wear resistance and all excellent polynary complicated copper alloy of mechanical property.

The synchronizer industry gets over obviously from the pressure of cost in pursuing the excellent more development of copper alloy ring gear material over-all properties, runs in the opposite direction with the requirement of market to price; Therefore new thinking of development is born; Cost of development is cheap relatively but have the Cu alloy material of high-mechanical property; And do not require that material has the excellent in resistance wear hardness simultaneously; Significantly improve wear resistance through other sophisticated surface treatment means again, the material cost of developing under this kind scheme can reduce, and satisfies the attrition resistant multiple performance requriements of shock-resistant, the surface treated ring gear surface of friction in synchronous ring toothing position in the speed-change process simultaneously.

Summary of the invention

The object of the present invention is to provide the very excellent complex brass material of a kind of mechanical property; In copper zinc alloy, add elements such as an amount of aluminium, manganese, iron, nickel specifically, and carry out optimum combination, propose rational content and method of manufacture.

The object of the invention is realized through following measure: brass material comprises following chemical components in mass percent: Cu 61.0 ~ 65.0; Al 5.0 ~ 7.0; Mn 2.5 ~ 5.5; Fe 1.5 ~ 3.5; Pb 0.2 ~ 1.0; Ni≤0.5; Si≤0.5; Sn≤0.2; All the other are Zn.

Preferred chemical components in mass percent is Cu 62.0 ~ 64.0; Al 5.5 ~ 6.5; Mn 4.8 ~ 5.2; Fe 1.8 ~ 2.3; Pb 0.3 ~ 0.5; Ni 0.2 ~ 0.45; Si≤0.5; Sn≤0.25; Zn 21.3 ~ 25.4.Best chemical components in mass percent is: Cu 63.0; Al 5.8; Mn 5.0; Fe 2.0; Pb 0.4; Ni 0.35; All the other are Zn.

The reasons are as follows of the active chemical design considerations of high strength copper alloy of the present invention and qualification content range:

Al: significantly improve hardness and the tensile strength and the ys of special brass, improve flowability and solidity to corrosion, reduce the scaling loss of Zn;

Mn: keep sizable plasticity when improving intensity and hardness, improve thermotolerance, solidity to corrosion;

Fe: the refinement alloy structure, when significantly not reducing plasticity, improve intensity, better with Al, Mn, Ni coexistence effect;

Ni: refinement alloy structure, content enlarge alpha phase zone more for a long time, improve alloy impelling strength and tensile strength;

Pb: effectively improve the machinability of cast brass, improve wear resistance;

Sn: suppress dezincify, improve alloy flowability, improve intensity and hardness; Content is limited in below 0.25%,

Si: improve hardness and mechanical property, content need be limited in below 0.5%, otherwise reduces unit elongation.

The measure that material of the present invention is realized also has: design is also adopted the master alloy that is fit to, so that the smooth adding of HMP element.This master alloy comprises following chemical components in mass percent: Al 43.0%; Mn 35.2%; Fe 18.8%; Ni 3.0%.

The reasons are as follows of design considerations of master alloy active chemical and qualification content range:

Al: the characteristics of main alloying element except that Cu, Zn in the invention material, the lower melting point that makes full use of this element a large amount of heat releases during with its fusing, as the constituent element of reduction master alloy fusing point;

Mn: the HMP element, reduce its fusing point through alloying; In addition Mn simple substance is flakey, and proportion is lower than the copper-based alloy material of invention, then can avoid its simple substance state to float on molten soup surface and oxidation through alloying;

Fe: the HMP element, reduce its fusing point through alloying;

Ni: the HMP element, reduce its fusing point through alloying;

High-strength wear-resistant copper alloy ingot casting of the present invention is used the middle frequency furnace manufacturing, carries out extrusion processing with the 1650T extrusion machine again, and process step is following:

1. red copper and master alloy are added the fusing that is rapidly heated in the stove;

2. add the copper scale (banning use of moisture, oil-containing bits material) of this material,, constantly add the bits material according to bits material fusing situation in the stove;

3. after virgin material melts with the bits material, add red copper or the bits material reserved and be cooled to below 1000 ℃, add Zn and Pb, intensification;

4. after all furnace charge has melted, be warmed up to more than 1080 ℃, seethed with excitement 1 ~ 3 minute, add refining agent 3 ~ 4Kg, stirring is left standstill, and slagging-off is warmed up to more than 1100 ℃, fully stirs the back sampling.

5. adopt XRF to detect the stokehold sample ingredient, composition is qualified can be poured into a mould, otherwise the cast of adjustment alloying constituent to qualified row again.

6. carry out red ingot casting with vertical D.C.casting, casting speed is 950 ~ 1140Kg/h;

7. under 680 ~ 740 ℃ of temperature, be expressed to required specification base material after ingot casting being cut to certain-length.

Embodiment

By requirement of the present invention red copper and master alloy are added the fusing that is rapidly heated in the stove; Add copper scale (banning use of moisture, oil-containing bits material),, constantly add the bits material according to bits material fusing situation in the stove; After virgin material melts with the bits material, add red copper or the bits material reserved and be cooled to below 1000 ℃, add Zn and Pb, intensification; After all furnace charge has melted, be warmed up to more than 1080 ℃, seethed with excitement 1 ~ 3 minute, add refining agent 3 ~ 4Kg; Stirring is left standstill, and slagging-off is warmed up to more than 1100 ℃, fully stirs the back sampling.Adopt XRF to detect the stokehold sample ingredient, composition is qualified can be poured into a mould, otherwise the cast of adjustment alloying constituent to qualified row again.Carry out red ingot casting with vertical D.C.casting, casting speed is 950 ~ 1140Kg/h; Under 680 ~ 740 ℃ of temperature, be expressed to required specification tubing after ingot casting is cut to certain-length.

Chemical composition analysis is carried out in material sampling of the present invention, and chemical ingredients result sees table 1.

Table 1

Mechanical property test is carried out in material sampling of the present invention, and test-results is seen table 2.

Table 2

Do as one likes ability testing data is visible, and material of the present invention has very excellent mechanical property; , then can be widely used on the high-end product of machinery, automobile and other industries as obtaining the excellent abrasive ability after pasting means such as carbon or sprayed molybdenum through sophisticated surface treatment.

Claims (4)

1. high strength copper alloy material, it is characterized in that comprising the chemical ingredients of following quality percentage: Cu 61.0 ~ 65.0; Al 5.0 ~ 7.0; Mn 2.5 ~ 5.5; Fe 1.5 ~ 3.5; Pb 0.2 ~ 1.0; Ni≤0.5; Si≤0.5; Sn≤0.2; All the other are Zn.

2. high strength copper alloy material according to claim 1 is characterized in that preferred chemical components in mass percent is Cu 62.0 ~ 64.0; Al 5.5 ~ 6.5; Mn 4.8 ~ 5.2; Fe 1.8 ~ 2.3; Pb 0.3 ~ 0.5; Ni 0.2 ~ 0.45; Si≤0.5; Sn≤0.25; Zn 21.3 ~ 25.4.

3. high strength copper alloy material according to claim 1, it is characterized in that best chemical components in mass percent is: Cu 63.0; Al 5.8; Mn 5.0; Fe 2.0; Pb 0.4; Ni 0.35; All the other are Zn.

4. the working method of high strength copper alloy according to claim 1 is characterized in that its technological process of production is:

1. red copper and master alloy are added the fusing that is rapidly heated in the stove;

2. add copper scale (banning use of moisture, oil-containing bits material),, constantly add the bits material according to bits material fusing situation in the stove;

3. after virgin material melts with the bits material, add red copper or the bits material reserved and be cooled to below 1000 ℃, add Zn and Pb, intensification;

4. after all furnace charge has melted, be warmed up to more than 1080 ℃, seethed with excitement 1 ~ 3 minute, add refining agent 3 ~ 4Kg, stirring is left standstill, and slagging-off is warmed up to more than 1100 ℃, fully stirs the back sampling;

5. adopt XRF to detect the stokehold sample ingredient, composition is qualified can be poured into a mould, otherwise the cast of adjustment alloying constituent to qualified row again;

6. carry out red ingot casting with vertical D.C.casting, casting speed is 950 ~ 1140Kg/h;

7. under 680 ~ 740 ℃ of temperature, be expressed to required specification base material after ingot casting being cut to certain-length.