CN103131894A

CN103131894A - High-elasticity and high-conductivity copper alloy and production method thereof

Info

Publication number: CN103131894A
Application number: CN2013100836856A
Authority: CN
Inventors: 张恒; 王永如; 巢国辉; 叶东皇; 丁家园
Original assignee: Ningbo Jintian Copper Group Co Ltd
Current assignee: Ningbo Jintian Copper Group Co Ltd
Priority date: 2013-03-15
Filing date: 2013-03-15
Publication date: 2013-06-05
Anticipated expiration: 2033-03-15
Also published as: CN103131894B

Abstract

The invention relates to a high-elasticity and high-conductivity copper alloy which comprises the following components in percentage by mass: 0.1-1% of Fe, 0.05-0.3% of P, 0.1-1.0% of Sn, 0.1-1.0% of Ni, 13-20% of Zn, 0.005-0.05% of B and the balance of Cu and inevitable impurity. The production process flow comprises the following steps: smelting, performing pull casting, performing hot rolling, performing face milling, performing rough rolling, annealing, washing with acid, performing intermediate rolling, performing solution treatment, performing precision rolling, performing aging treatment, performing shear dividing, and packaging finished products. Temperature tests, weight hanging tests, 5000-time plugging/unplugging tests and plug unplugging required maximum force tests show that the high-elasticity copper alloy prepared through the production process flow has fine stress relaxation resistance. The copper alloy produced from the components through the method has high elasticity and high conductivity, is low in cost and can be used as an elastic electric connector material instead of a tin-phosphor bronze alloy.

Description

A kind of high elasticity and high conductivity copper alloy and production method thereof

Technical field

The present invention relates to resilient material, relate in particular to a kind of high elasticity and high conductivity copper alloy and production method thereof.

Background technology

Tin-phosphor bronze has the premium propertiess such as very high intensity, elasticity, wear resistance and electroconductibility, be widely used in electrical equipment and patch elastic element, high speed development along with electronics, communication and automobile industry, the demand of tin-phosphor bronze band and day sharp increase, but the tin-phosphor bronze price that causes in short supply of tin resource is comparatively expensive, just seems extremely urgent so develop some novel substitute products.Existing many patent documentations are introduced multiple elastic copper alloy, are fit to the special material application but be only limited to.Introduce the CuNiSiAl series elastic copper alloy such as CN101984107A and have the characteristics such as superstrength, high resistance to stress be loose, be applicable to space flight and aviation and the high electrically conductive elastic device of little electrician's industry.CN102041407A introduces a kind of high-strength high-conductivity micro-boron copper alloy material, be fit to contact Wire for High-Speed Electric Railway, large specification circuit lead frame electrode materials, above-mentioned alloy ingredient is complicated, manufacturing cost is not less than tin-phosphor bronze, also there is no to substitute at present product and the production technique of tin-phosphor bronze.

Summary of the invention

The objective of the invention is to develop a kind of high elasticity and high conductivity copper alloy and production method thereof of alternative tin-phosphor bronze, the performance of this alloy higher than or be equivalent to tin-phosphor bronze, the various elements that alternative part tin-phosphor bronze and berylliumbronze are made.

The high elasticity and high conductivity copper alloy, its moiety is: 0.1 ~ 1%Fe, 0.05 ~ 0.3%P, 0.1 ~ 1.0%Sn, 0.1 ~ 1.0%Ni, 13 ~ 20%Zn, 0.005 ~ 0.05%B, all the other are Cu and inevitable impurity.

The technological process of production of above-mentioned alloy is: melting → cast → hot rolling → mill face → roughing → annealing → pickling → in roll → solution treatment → finish rolling → ageing treatment → sub-cut → finished product packing.

High elasticity and high conductivity copper alloy of the present invention is to add the following element of reinforced alloys on a small quantity on the brass basis of high copper content.

The interpolation of Fe, P element forms nanometer particle Fe ₃P, after processing by solid solution aging, its solubility with temperature descends and rapid drawdown is separated out with the form of simple substance or alloy cpd particle, hinders dislocation glide and suppresses recrystallize and improve strengthening effect and thermostability by the disperse particulate.

The interpolation of Sn, Ni element forms the spinodal decomposition strengthening mechanism, can be grown up continuously by concentration fluctuations by parent phase and form cenotype, do not need nucleation process, form fine composition after precipitation and be the microstructure that the cycle changes in whole grain colony, the different two-phase of this composition keeps coherence and the recoverable strain field energy that produces stops dislocation moving strongly, thereby the generation strengthening effect can be saved a large amount of Sn element materials.

The B element has very high chemically reactive; the B that adds trace can a large amount of rich B small-particles can occur at grain boundaries; due to B atom migration difficulty to non-crystal boundary from sosoloid; so when thermal treatment; these small-particles have good alligatoring drag, and surely are tied in crystal boundary, prevent that crystal boundary from moving; final crystal grain thinning, mechanical property and the processing performance of raising material.

Suitably reduce the zinc consumption in this alloy, replace part of nickel with a small amount of iron, with the boron replacement part phosphorus of trace, to put forward heavy alloyed elasticity and anti-stress relaxation ability, with higher copper content to keep high conductivity; Reduce simultaneously tin and nickel consumption at the copper alloy that forms high elasticity and high conductivity, be used for substituting tin-phosphor bronze and make snappiness connector material.

Description of drawings

Fig. 1 is the metallograph (amplifying 200 times) of copper alloy product of the present invention.

Embodiment

The invention will be further described below in conjunction with the embodiment of table 1.

Embodiment

press the listed proportioning of table 1, adopt the line frequency induction furnace melting, first add the copper-iron alloy that contains Fe amount 25%, the pure nickel plate, pure electrolytic copper, smelting temperature 1150-1220 ℃, after melting, add the 0# zinc ingot metal, after flame occurring, add block tin, 14% phosphor copper and pure boron, wrap up with copper pipe in order to prevent that phosphor copper and pure boron are oxidized when adding stove, block tin directly adds in stove, all stir after fusing, adopt semicontinuous cast, the cast temperature is 1120-1200 ℃, casting speed is 80-90mm/min, ingot casting is of a size of 270mm * 400mm * 4800mm.The copper alloy main component is as shown in table 1.

Table 1 alloying constituent table (wt%)

Element	Cu	Zn	Fe	P	Sn	Ni	B	Impurity
									Embodiment one	78.8	19.69	0.78	0.25	0.25	0.20	0.02	0.01
Embodiment two	80.5	18.08	0.58	0.12	0.34	0.36	0.007	0.013
									Embodiment three	82.2	15.89	0.42	0.08	0.67	0.70	0.03	0.01
Embodiment four	83.4	14.53	0.24	0.06	0.85	0.87	0.045	0.005
									Embodiment five	84.7.	13.14	0.12	0.05	0.97	0.98	0.035	0.005

Ingot casting heats in walking-beam furnace, 850～880 ℃ of Heating temperatures, and heat-up time, 2～3h, carried out hot rolling at 750～830 ℃, and after hot rolling, slab thickness is 13～14mm; Adopt φ 330/760 * 600 roughing mill to carry out roughing after milling face, carry out process annealing in bell type annealing furnace (TZQ-140/330 type), annealing temperature is 500～540 ℃, insulation 6～8h; Carry out pickling on the degreasing pickling machine; In roll and adopt that in Φ 230/600 * 560, finishing mill is rolled; Be heated to 800～850 ℃ of temperature in walking-beam furnace, insulation 2～3h lifts up into and carries out solution treatment in the solid solution tank; Finish rolling adopts φ 160/550 * 600 finishing mill rolling, carries out ageing treatment in bell type annealing furnace (TZQ-140/330 type), 420～450 ℃ of aging temps, insulation 4～5h; Carry out sub-cut and become finished product on banding machine.

The comparison of table 2 high-elasticity copper alloy finished product and tin-phosphor bronze end properties

The trade mark	Tensile strength (Mpa)	Unit elongation (%)	Hardness (HV)	Young's modulus (GPa)	Specific conductivity (%IACS)
						Embodiment one	482	15	156	121	34.8
Embodiment two	521	13	162	118	36.4
						Embodiment three	534	12	165	117	35.8
Embodiment four	508	13	164	119	36.7
						Embodiment five	519	14	160	119	36.8
Tin-phosphor bronze	482	29	157	120	14.5

Table 2 is depicted as the comparison of high-elasticity copper alloy of the present invention and tin-phosphor bronze end properties, and the Young's modulus of this high-elasticity copper alloy is in the 120GPa left and right, and is substantially suitable with tin-phosphor bronze, illustrates that the elastic performance of this alloy is good; Specific conductivity far away higher than tin-phosphor bronze, illustrates that the conductivity of this alloy is far away higher than tin-phosphor bronze in the 35%IACS left and right; When hardness was suitable, the unit elongation of this alloy did not still affect its Sheet Metal Forming Technology a shade below tin-phosphor bronze, still has good plasticity and toughness.

From Fig. 1 metallographic, tissue is all the α phase, the grain fineness number size is between 0.005 ~ 0.008mm, and the grain fineness number of tin-phosphor bronze is 0.01-0.015mm, the grain fineness number of alloy of the present invention is relatively tiny, and because the stress relaxation major part occurs in crystal grain inside, more crystal boundary energy becomes the obstacle of effective obstruction stress relaxation, so tiny crystal grain is conducive to improve the stress relaxation resistance of material, to obtain higher elastic performance; Black particle is Fe through TEM (transmission electron microscope) analysis ₃P, the black particle that disperse distributes hinder dislocation glide and suppress recrystallize, improve strengthening effect and thermostability, to obtain high strength property.

The switch on wall that this high elasticity and high conductivity copper alloy is made, through overtemperature weathering test (70 ± 2 ℃ of temperature, insulation 168h) after, can bear the 3N lift heavy, through 5000 tests of plug, also can bear the 3N lift heavy afterwards, the maximum, force that pulls the plug out of the socket＜40N test is also qualified, through test, illustrate that this alloy can substitute the tin-phosphor bronze materials'use fully in elasticity electrical connector field.

Claims

1. high elasticity and high conductivity copper alloy is characterized in that the massfraction of copper alloy composition is: 0.1 ~ 1%Fe, and 0.05 ~ 0.3%P, 0.1 ~ 1.0%Sn, 0.1 ~ 1.0%Ni, 13 ~ 20%Zn, 0.005 ~ 0.05%B, all the other are Cu and inevitable impurity.

2. the production method of high elasticity and high conductivity copper alloy according to claim 1, its feature comprises the following steps:

A: adopt the line frequency induction furnace melting, first add the copper-iron alloy, pure nickel plate, the pure electrolytic copper that contain Fe amount 25%, smelting temperature 1150-1220 ℃, after melting, add the 0# zinc ingot metal, after flame occurring, add 14% phosphor copper and pure boron with copper pipe parcel, block tin directly adds in stove, stir after all material fusing, adopt semicontinuous cast, the cast temperature is 1120-1200 ℃, casting speed is 80-90mm/min, and cast becomes ingot casting;

B: ingot casting heated in walking-beam furnace 2～3 hours, and then 850～880 ℃ of Heating temperatures carry out hot rolling at 750～830 ℃, and after hot rolling, slab thickness is 13～14mm; Adopt φ 330/760 * 600 roughing mill to carry out roughing after milling face, carry out process annealing in bell type annealing furnace, annealing temperature is 500～540 ℃, insulation 6～8h; Carry out pickling on the degreasing pickling machine; In roll and adopt that in Φ 230/600 * 560, finishing mill is rolled; Be heated to 800～850 ℃ of temperature in walking-beam furnace, insulation 2～3h lifts up into and carries out solution treatment in the solid solution tank again; Finish rolling adopts φ 160/550 * 600 finishing mill rolling, carries out ageing treatment at bell type annealing furnace, 420～450 ℃ of aging temps, insulation 4～5h; Divide on banding machine and be cut into finished product.