CN101643867A - High performance copper casting alloy and preparation method thereof - Google Patents

Abstract

The invention discloses a high performance copper casting alloy, comprising the following chemical compositions by weight percent: 8.5-10.5% of aluminum, 1.0-3.0% of nickel, 3.0-5.0% of iron, 1.0-3.0%of manganese, 0.1-0.15% of cerium and the balance copper. The preparation method comprises the following steps: preheating a crucible, adding electrolytic copper, which is crushed to nubbles and accounts for 10% of the total amount of copper to be added, manganese, electrolytic nickel, charcoal and the balance electrolytic copper according to the charging sequence, heating to 1200-1250 DEG C, adding sheet iron, aluminum, cooling copper and rare earth cerium, heating to 1200-1250 DEG C, adding refining agent, adding phosphor copper preliminary alloy to deoxidize, discharging and pouring and performing air cooling to casting. The high performance copper casting alloy of the invention has high strength and good toughness, can be used for the preparation of high load mechanical transmission parts such as nuts, worm wheels, bearings and the like and can prolong the service life of mechanical transmission parts and reduce the maintenance load of devices, thus greatly reducing the cost.

Description

High performance copper casting alloy and preparation method thereof

Technical field

The present invention relates to a kind of non-ferrous metal alloy, relate in particular to a kind of comprehensive mechanical performance cast copper alloy preferably, belong to the metallic substance technical field.

Background technology

The existing main raw that is used to make screw, worm gear, wear-resisting slide block, gear, axle sleeve, bearing manufacturing is cast brass, tinbronze and xantal, but above-mentioned materials is because comprehensive mechanical property is relatively poor.For example the intensity of some trade mark cast copper alloy and hardness are higher, but its plasticity and toughness are lower; Or the plasticity and toughness of other trade mark cast copper alloys are higher and intensity and hardness are lower.Be difficult to satisfy the requirement in work-ing life of cast copper alloy under the more abominable operating mode of modern industry.

In recent years, the high performance casting wear-resistant copper alloy has been carried out a large amount of research both at home and abroad, it is the HZ alloy that the Cu-Co-Be of Japan's exploitation is abroad arranged, and Cu-Fe-P-Sn is the KT-1 alloy, and Cu-Cr-Zr is a DMC alloy etc.Domestic have KK alloy, the high-strength wearable bronze of Hl (Al-Fe-Mn-Pb system), an a kind of novel copper-base alloy moulding stock that is used for stainless steel and the stretch forming of 08F low carbon steel products etc.Wherein the chemical ingredients of KK alloy (weight percent) is aluminium 9-10.5%, nickel 1.0-2.5%, iron 3.0-5.0%, manganese 1.0-2.5%, Yu Weitong, and its mechanical property is: tensile strength 633MPa, unit elongation 18%, hardness 169HB, impelling strength 43J/cm ²The KK alloy has improved the comprehensive mechanical property of casting wear-resistant copper alloy significantly, but plasticity index such as its unit elongation, impelling strength do not reach yet than higher degree, influences the work-ing life of high performance copper casting alloy.

Summary of the invention

The comprehensive mechanical property excellence that the purpose of this invention is to provide a kind of high performance copper casting alloy, this cast copper alloy.

The present invention is achieved by the following technical programs:

A kind of high performance copper casting alloy, by weight percentage, its chemical ingredients is: aluminium 8.5-10.5%, nickel 1.0-3.0%, iron 3.0-5.0%, manganese 1.0-3.0%, cerium 0.1-0.15%, Yu Weitong.

A kind of this preparation method of high performance copper casting alloy preparation method may further comprise the steps:

1) crucible is preheating to cherry red in the Medium frequency induction smelting furnace;

2) add electrolytic copper, manganese, electrolytic nickel, charcoal, the electrolytic copper of the pulverizing frustillatum need add copper amount 10% by loading sequence; Wherein charcoal needs to keep 2-4 hour, to remove moisture and organism more than high temperature carbonization to 800 ℃;

3) accelerated warming fusing, temperature raising is to 1200-1250 ℃, and The faster the better for burn-off rate;

4) add iron plate, stir;

5) add aluminium, add cooling copper;

6) add the rare earth cerium that adds with the copper rare earth intermediate alloy, and need bell jar to be pressed into;

7) static 5-10 minute, the stokehold check, fracture should be carefully and evenly, and the clod wash angle reaches more than 90 °;

8) be warming up to 1200-1250 ℃, add refining agent.Press furnace charge 0.10% weight and add the phosphor bronze alloy deoxidation;

9) thermometric, the cast of coming out of the stove of skimming, air-cooled foundry goods.

The invention has the beneficial effects as follows:

Adopt the high performance copper casting alloy of composition proportion of the present invention and preparation method's manufacturing to have the excellent comprehensive mechanical property, its tensile strength 〉=700MPa, unit elongation 〉=25%, hardness 〉=140HB, impelling strength 〉=50J/cm ²With existing same type of material KK alloy phase ratio, its tensile strength has improved more than 10.6%, and unit elongation has improved more than 38.9%, and impelling strength has improved more than 11.6%; Has excellent comprehensive mechanical properties.The mechanical transmissioning piece that the present invention is used to make screw, worm gear, wear-resisting slide block, gear, axle sleeve, the contour load operation of bearing, can prolong the work-ing life of above-mentioned mechanical transmissioning piece significantly, reduce mechanical transmissioning piece because of the undesirable damage that in high loading work, causes of comprehensive mechanical property, reduce the maintenance load of equipment, thereby greatly reduced use cost.

Advantage of the present invention and characteristics will illustrate by the non-limitative illustration of following preferred embodiment and explain that these embodiment only provide as an example with reference to accompanying drawing.

Description of drawings

Fig. 1 is a preparation method's of the present invention schema.

Embodiment

The invention will be further described below in conjunction with drawings and Examples.

Prepare high performance copper casting alloy of the present invention by following material mixture ratio and step: aluminium 8.5-10.5% in the material mixture ratio, nickel 1.0-3.0%, iron 3.0-5.0%, manganese 1.0-3.0%, cerium 0.1-0.15%, Yu Weitong.

As shown in Figure 1, the preparation method of high performance copper casting alloy of the present invention is as follows:

1) crucible is preheating to cherry red in the Medium frequency induction smelting furnace;

2) by loading sequence add fritter shape electrolytic copper (account for total need add copper content 10%), manganese metal, electrolytic nickel, charcoal, electrolytic copper; Wherein charcoal needs to keep 2-4 hour, to remove moisture and organism more than high temperature carbonization to 800 ℃;

3) accelerated warming fusing, temperature raising is to 1200-1250 ℃, and The faster the better for burn-off rate;

4) add iron plate, stir;

5) add aluminium, add cooling copper;

6) add the rare earth cerium, the rare earth cerium adds with the copper rare earth intermediate alloy, and needs bell jar to be pressed into;

7) static 5-10 minute, the stokehold check, fracture should be carefully and evenly, and the clod wash angle reaches more than 90 °;

8) be warming up to 1200-1250 ℃, add refining agent.Press furnace charge 0.10% weight and add the phosphor bronze alloy deoxidation;

9) thermometric, the cast of coming out of the stove of skimming, air-cooled foundry goods.

The cast copper alloy composition proportion of three embodiment and comprehensive mechanical property are to such as table 1.

Table 1

The rare earth cerium that contains among the present invention can play deoxidation, desulfurization in fusion process, and generate some dystectic compounds (as PbCe with some detrimental impurity Pb, Bi etc., BiCel), play and remove detrimental impurity, purify the matrix of alloy and the effect of crystal boundary.The adding of rare earth cerium simultaneously is the microstructure of refinement alloy effectively, and crystal grain thinning is the only resource that improves the strength of materials and plasticity and toughness simultaneously, and the comprehensive mechanical performance of cast copper alloy is greatly enhanced, and it can be more widely used.

In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.

Claims (2)

1, a kind of high performance copper casting alloy is characterized in that, by weight percentage, the chemical ingredients of this copper alloy is: aluminium 8.5-10.5%, nickel 1.0-3.0%, iron 3.0-5.0%, manganese 1.0-3.0%, cerium 0.1-0.15%, Yu Weitong.

2, the preparation method of high performance copper casting alloy according to claim 1 is characterized in that, this preparation method may further comprise the steps:

1) crucible is preheating to cherry red in the Medium frequency induction smelting furnace;

2) add electrolytic copper, manganese, electrolytic nickel, charcoal, all the other electrolytic coppers of the pulverizing frustillatum that need add copper amount 10% successively by loading sequence; Wherein charcoal needs to keep 2-4 hour, to remove moisture and organism more than high temperature carbonization to 800 ℃;

3) accelerated warming fusing, temperature raising is to 1200-1250 ℃, and The faster the better for burn-off rate;

4) add iron plate, stir;

5) add aluminium, add cooling copper;

6) add the rare earth cerium that adds with the copper rare earth intermediate alloy, and need bell jar to be pressed into;

7) static 5-10 minute, the stokehold check, fracture should be carefully and evenly, and the clod wash angle reaches more than 90 °;

8) be warming up to 1200-1250 ℃, add refining agent.Press furnace charge 0.10% weight and add the phosphor bronze alloy deoxidation;

9) thermometric, the cast of coming out of the stove of skimming, air-cooled foundry goods.

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