CN102021359B - Cu-Ni-Si alloy with high Ni and Si content and preparation method thereof - Google Patents
Cu-Ni-Si alloy with high Ni and Si content and preparation method thereof Download PDFInfo
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Abstract
The invention provides a Cu-Ni-Si alloy with high Ni and Si content. In the Cu-Ni-Si alloy, the total content of Ni and Si is from 3% to 20%, and the balance is Cu. The atomic ratio of Ni to Si is 2:1-3:1. The invention provides a preparation method which comprises the following steps of: firstly, smelting Ni, Si and Cu blocks into melt, then pouring into alloy ingots, carrying out solution heat treatment at a temperature of 850 DEG C to 1000 DEG C for 0.5-4h, carrying out hierarchic rolling for the alloy ingots at a temperature of 800 DEG C to 950 DEG C in a ratio of 9:1-25:1, and finally carrying out ageing treatment at a temperature of 450 DEG C to 550 DEG C for 8-16h. The alloy can reach proper strength (52--850 Mpa) and conductivity (25-65% IACS).
Description
Technical field
The invention belongs to metal matrix alloy/technical field of composite materials, be specifically related to the Cu-Ni-Si Alloy And Preparation Method of a kind of high Ni, Si content.
Background technology
The fast development of science and technology and modern industry is had higher requirement to the over-all properties of Cu and alloy thereof, touch bridge, conticaster crystallizer liner, circuit lead frame, power asynchronous traction motor of high rotor, electric railway contact wire (contact line), thermonuclear reactor experiment (ITER) divertor vertical target radiator element, high impulse magnetic field conductors etc. such as the electric works switch and require material not only to have good electroconductibility also must to have higher intensity, and these performances to be not pure Cu can both satisfy simultaneously.Therefore, develop the research emphasis that the high-performance Cu base alloy/matrix material that satisfies above-mentioned requirements becomes modern Cu base novel material.The high strength of copper alloy and high conductivity are the characteristics of conflict, are subject to over the years the great attention of vast researcher always.Traditional alloy strengthening method has been widely used as the reinforcement means of various alloys such as solution strengthening, precipitation strength, refined crystalline strengthening and working hardening etc.Therefore, how high-strength highly-conductive Cu base alloy/composite manufacture key is farthest to improve the intensity of copper alloy under the prerequisite that guarantees the not obvious reduction of electroconductibility.
Owing to there not being magnetic, can not produce because of eddying effect a large amount of joule heatings, the Cu-Ni-Si alloy has caused widely to be paid close attention to, and is considered to replace Cu-Be as blaster fuse frame material, and has obtained first-stage success.Up to now, it mainly is that the precipitation strength that the precipitated phase of separating out in the ag(e)ing process produces causes that the Cu-Ni-Si that researches and develops is associated golden strengthening mechanism, because Ni and Si total content generally all are lower than 5wt.% in the existing research, the quantity of the precipitated phase that it produces is limited, causes the raising of intensity not too remarkable.Because the solid solubility of Si atom in Cu collective is limited, this means that the precipitated phase of separating out in the single dependence ag(e)ing process improves the intensity of Cu-Ni-Si alloy, its intensity increment that produces can not reach higher level.In the multiple reinforcement means of alloy, lattice distortion that complex intensifying causes is minimum, and the strengthening effect of its generation obviously and minimum to the scattering process of electronics is expected to make alloy to reach best intensity and the combination of specific conductivity.Therefore, if can generate second-phase at the process of setting situ at the Cu-Ni-Si alloy, and in heat treatment process subsequently, rely on solid-state phase changes to separate out precipitated phase, the way that namely relies on complex intensifying to combine with precipitation strength then can enlarge the scope of design of Ni and Si total content in the alloy largely, also can reach higher level to the raising of intensity.The key of the method is how to design the ratio of Ni in the alloy, Si atom, form and the quantity of the wild phase that the control original position is separated out, and reduce as much as possible the solid solution of solid solution atom in matrix.
Summary of the invention
The Cu-Ni-Si alloy preparation method that the purpose of this invention is to provide a kind of high Ni, Si content, having solved existing method, to prepare Ni and the Si content of this alloy lower, and the purer Cu material of tensile strength improves not too significant problem.
The technical solution adopted in the present invention is, the Cu-Ni-Si alloy of a kind of high Ni, Si content, and by weight percentage, be grouped into by following three kinds of one-tenth: the total content of Ni and Si is 3%-20%, and all the other are Cu, and the weight percent sum of each composition is 100%; Wherein, the atomic ratio of Ni/Si is Ni:Si=2:1-3:1.
The preparation method of above-mentioned Cu-Ni-Si alloy comprises following operation steps:
Take by weighing Ni, Si and the Cu piece of each simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, wherein, the total content of Ni and Si is 3%-20%, and all the other are Cu, the weight percent sum of each composition is 100%, and the atomic ratio of Ni/Si is Ni:Si=2:1-3:1; Again Ni, Si and Cu piece are carried out pre-treatment removal oxide on surface;
Step 2, melting
Load weighted Ni, Si and Cu piece are put into Medium Frequency Induction Heating Furnace be smelted into uniform melt;
Step 3, cast
The alloy melt that step 2 is obtained pours in the graphite casting mould, the demoulding behind the Cu-Ni-Si alloy graining, and shrend is cooled to room temperature, thus obtaining the Cu-Ni-Si alloy cast ingot, cast front mold preheating temperature is 400 ± 20 ℃;
Step 4, solution treatment
Alloy cast ingot is carried out solution treatment in heat treatment furnace, solid solubility temperature is 850-1000 ℃, and the treatment time is 0.5-4h, takes out subsequently the sample shrend to room temperature;
Step 5, the heat engine tool is processed
The alloy cast ingot that step 4 is prepared is heated to 1000 ℃ in argon atmospher protection stove, after subsequently alloy cast ingot being taken out from stove, be that to carry out classification under 800-950 ℃ the condition rolling in temperature, final rolling ratio is 9:1-25:1, and rolling complete rear shrend is to room temperature;
Step 6, ageing treatment
Rolling good alloy is carried out ageing treatment in heat treatment furnace, aging temp is 450-550 ℃, and aging time is 8-16h, takes out air cooling to room temperature after ag(e)ing process finishes, and get final product.
Wherein, in the step 1 Ni, Si and Cu piece are carried out pre-treatment: be that 5% dilute hydrochloric acid solution clean to be removed oxide on surface with concentration, then use alcohol wash, oven dry.
Wherein, in the step 2 Ni, Si and Cu piece are carried out melting: first the copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, the Ni piece that will take by weighing after Cu melts fully and Si piece are elevated to temperature 1500 ± 20 ℃ after adding the Cu liquid of melting again, insulation 10min.
The invention has the beneficial effects as follows, take elemental metals Cu, Ni and Si as raw material, adopt common fusion casting to prepare alloy cast ingot, make alloy reach suitable intensity (520-850MPa) and electroconductibility (25-65%IACS) by carrying out the processing of subsequent heat treatment and heat engine tool.Preparation technology of the present invention is simple, and cost is comparatively cheap, can be used for osculatory, lead frame, contactor material and contact material, can obtain the block alloy material of large volume, also can obtain sheet material, wire rod etc., be widely used in the fields such as electrotechnical, electronic, high-speed railway.
Description of drawings
Fig. 1 is preparation method's of the present invention schema;
Fig. 2 is the micro-organization chart of the prepared Cu-Ni-Si of the embodiment of the invention 1 * 1000 alloys;
Fig. 3 is the micro-organization chart of the prepared Cu-Ni-Si of the embodiment of the invention 2 * 100 alloys;
Fig. 4 is the micro-organization chart of the prepared Cu-Ni-Si of the embodiment of the invention 3 * 1000 alloys;
Fig. 5 is the micro-organization chart of the prepared Cu-Ni-Si of the embodiment of the invention 4 * 500 alloys;
Fig. 6 is the micro-organization chart of the prepared Cu-Ni-Si of the embodiment of the invention 5 * 200 alloys.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The invention provides the high-strength highly-conductive Cu-Ni-Si alloy of a kind of high Ni and Si content, by weight percentage, be grouped into by following three kinds of one-tenth: the total content of Ni and Si is 3%-20%, and all the other are Cu, and the weight percent sum of each composition is 100%; Wherein, the atomic ratio of Ni/Si is Ni:Si=2:1-3:1.Its strengthening mechanism is the Ni that the process of setting situ generates
3The second-phase of Si strengthen and (or) δ-Ni of separating out in the solid-state phase changes process
2The precipitation strength that the Si phase causes is improved the intensity of alloy largely, simultaneously owing to Ni, separating out of Si atom are improved the specific conductivity of alloy.
As shown in Figure 1, the present invention also provides the preparation method of above-mentioned Cu-Ni-Si alloy, comprises following operation steps:
Take by weighing Ni, Si and the Cu piece of each simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, wherein, the total content of Ni and Si is 3%-20%, and all the other are Cu, the weight percent sum of each composition is 100%, and the atomic ratio of Ni/Si is Ni:Si=2:1-3:1; Again Ni, Si and Cu piece are carried out pre-treatment: be that 5% dilute hydrochloric acid solution clean to be removed oxide on surface with concentration, then use alcohol wash, oven dry.
Step 2, melting
First the copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface (Graphite Powder 99 is as long as cover Cu piece upper surface), then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ again, insulation 10min.
Step 3, cast
The alloy melt that step 2 is obtained pours in the graphite casting mould, the demoulding behind the Cu-Ni-Si alloy graining, and shrend is cooled to room temperature immediately, thus obtaining the Cu-Ni-Si alloy cast ingot, cast front mold preheating temperature is 400 ± 20 ℃.
Step 4, solution treatment
Alloy cast ingot is carried out solution treatment in heat treatment furnace, solid solubility temperature is 850-1000 ℃, and the treatment time is 0.5-4h, takes out subsequently the sample shrend to room temperature.The effect of solution treatment is: make the complete solid solution of the precipitated phase that obtains in the process of setting, be convenient to follow-uply obtain tiny and precipitated phase that be evenly distributed.
Step 5, the heat engine tool is processed
The alloy cast ingot that step 4 is prepared is heated to 1000 ℃ in argon atmospher protection stove; after subsequently alloy cast ingot being taken out from stove; be that to carry out classification under 800-950 ℃ the condition rolling in temperature, final rolling ratio is 9:1-25:1, and rolling complete rear shrend is to room temperature.The effect that the heat engine tool is processed is: the reticulated structure on the broken crystal boundary, improve specific conductivity.
Step 6, ageing treatment
Rolling good alloy is carried out ageing treatment in heat treatment furnace, aging temp is 450-550 ℃, and aging time is 8-16h, takes out air cooling to room temperature after ag(e)ing process finishes, and get final product.The effect of ageing treatment is: the nuclear power of solid solution attitude is separated out with the precipitated phase form fully, put forward heavy alloyed intensity and specific conductivity.
Pre-prepared Ni and Si total content are 3wt.%, and all the other are Cu, and wherein the Ni/Si atomic ratio is the Cu-Ni-Si alloy of 3:1, and its operation steps is:
Taking by weighing Ni, Si and the Cu piece of simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, and they are carried out pre-treatment, is that 5% dilute hydrochloric acid solution cleans the removal oxide on surface with concentration first namely, then uses alcohol wash, oven dry; The copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, first at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ rapidly, insulation 10min; Subsequently alloy melt is poured in the graphite casting mould, the demoulding behind alloy graining, and immediately shrend obtains the Cu-Ni-Si alloy cast ingot to room temperature, cast front mold preheating temperature is 400 ± 20 ℃; The alloy cast ingot that obtains is carried out solution treatment in heat treatment furnace, solid solubility temperature is 850 ℃, and the treatment time is 0.5h, and shrend is to room temperature subsequently; Ingot casting after the solution treatment is put into argon atmospher protection stove be heated to 1000 ℃, subsequently ingot casting is taken out from stove, carry out classification rolling in temperature is 800-950 ℃ scope, rolling ratio is 9:1, and rolling complete rear shrend is to room temperature; At last the alloy after rolling is put into heat treatment furnace and carry out ageing treatment, aging temp is 550 ℃, and aging time is 8h, and ag(e)ing process is taken out air cooling to room temperature with alloy after finishing from stove, and get final product.
After tested, the specific conductivity of prepared Cu-Ni-Si alloy can reach 57.2IACS%, and tensile strength can reach 528.6MPa.
As shown in Figure 2,1000 times of micro-organization charts of the Cu-Ni-Si alloy that makes for this embodiment, matrix is rich Cu phase α-Cu (Ni, Si) phase among the figure, equally distributed black needle-like is δ-Ni mutually
2The Si phase.
Embodiment 2
Pre-prepared Ni and Si total content are 5wt.%, and all the other are Cu, and wherein the Ni/Si atomic ratio is the Cu-Ni-Si alloy of 2:1, and its operation steps is:
Take by weighing Ni, Si and the Cu piece of simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, and they are carried out pre-treatment: be that 5% dilute hydrochloric acid solution clean to be removed oxide on surface with concentration, then use alcohol wash, oven dry; The copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, first at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ rapidly, insulation 10min; Subsequently alloy melt is poured in the graphite casting mould, immediately shrend is cooled to room temperature after the alloy graining demoulding, obtains the Cu-Ni-Si alloy cast ingot, and cast front mold preheating temperature is 400 ± 20 ℃; The alloy cast ingot that obtains is carried out solution treatment in heat treatment furnace, solid solubility temperature is 850 ℃, and the treatment time is 2h, and shrend is to room temperature subsequently; Ingot casting after the solution treatment is put into argon atmospher protection stove be heated to 1000 ℃, subsequently ingot casting is taken out from stove, carry out classification rolling in temperature is 800-950 ℃ scope, rolling ratio is 25:1, and rolling complete rear shrend is to room temperature; At last the alloy after rolling is put into heat treatment furnace and carry out ageing treatment, aging temp is 450 ℃, and aging time is 8h, and ag(e)ing process is taken out air cooling to room temperature with alloy after finishing from stove, and get final product.
After tested, the specific conductivity of prepared Cu-Ni-Si alloy can reach 44.8IACS%, and tensile strength can reach 678.6MPa.
As shown in Figure 3,100 times of micro-organization charts of the Cu-Ni-Si alloy that makes for this embodiment, matrix is rich Cu phase α-Cu (Ni, Si) phase among the figure, black lines shape or corynebacterium are Ni
3The Si phase.
Embodiment 3
Pre-prepared Ni and Si total content are 10wt.%, and all the other are Cu, and wherein the Ni/Si atomic ratio is the Cu-Ni-Si alloy of 3:1, and its operation steps is:
Taking by weighing Ni, Si and the Cu piece of simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, and they are carried out pre-treatment, is that 5% dilute hydrochloric acid solution cleans the removal oxide on surface with concentration first namely, then uses alcohol wash, oven dry; The copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, first at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ rapidly, insulation 10min; Subsequently alloy melt is poured in the graphite casting mould, immediately shrend obtains the Cu-Ni-Si alloy cast ingot to room temperature after the alloy graining demoulding, and cast front mold preheating temperature is 400 ± 20 ℃; The alloy cast ingot that obtains is carried out solution treatment in heat treatment furnace, solid solubility temperature is 850 ℃, and the treatment time is 1h, and shrend is to room temperature subsequently; Ingot casting after the solution treatment is put into argon atmospher protection stove be heated to 1000 ℃, subsequently ingot casting is taken out from stove, carry out classification rolling in temperature is 800-950 ℃ scope, rolling ratio is 16:1, and rolling complete rear shrend is to room temperature; At last the alloy after rolling is put into heat treatment furnace and carry out ageing treatment, aging temp is 450 ℃, and aging time is 16h, and ag(e)ing process is taken out air cooling to room temperature with alloy after finishing from stove, and get final product.
After tested, the specific conductivity of prepared Cu-Ni-Si alloy can reach 31.5IACS%, and tensile strength can reach 728.4MPa.
As shown in Figure 4,1000 times of micro-organization charts of the Cu-Ni-Si alloy that makes for this embodiment, matrix is rich Cu phase α-Cu (Ni, Si) phase among the figure, the silver gray lath-shaped is Ni mutually
3Si phase, equally distributed particulate state are δ-Ni mutually
2The Si phase.
Embodiment 4
Pre-prepared Ni and Si total content are 10wt.%, and all the other are Cu, and wherein the Ni/Si atomic ratio is the Cu-Ni-Si alloy of 2.5:1, and its operation steps is:
Taking by weighing Ni, Si and the Cu piece of simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, and they are carried out pre-treatment, is that 5% dilute hydrochloric acid solution cleans the removal oxide on surface with concentration first namely, then uses alcohol wash, oven dry; The copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, first at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ rapidly, insulation 10min; Subsequently alloy melt is poured in the graphite casting mould, immediately shrend obtains the Cu-Ni-Si alloy cast ingot to room temperature after the alloy graining demoulding, and cast front mold preheating temperature is 400 ± 20 ℃; The alloy cast ingot that obtains is carried out solution treatment in heat treatment furnace, solid solubility temperature is 1000 ℃, and the treatment time is 2h, and shrend is to room temperature subsequently; Ingot casting after the solution treatment is put into argon atmospher protection stove be heated to 1000 ℃, subsequently ingot casting is taken out from stove, carry out classification rolling in temperature is 800-950 ℃ scope, rolling ratio is 16:1, and rolling complete rear shrend is to room temperature; At last the alloy after rolling is put into heat treatment furnace and carry out ageing treatment, aging temp is 500 ℃, and aging time is 10h, and ag(e)ing process is taken out air cooling to room temperature with alloy after finishing from stove, and get final product.
After tested, the specific conductivity of prepared Cu-Ni-Si alloy can reach 42.7IACS%, and tensile strength can reach 694.1MPa.
As shown in Figure 5,500 times of micro-organization charts of the Cu-Ni-Si alloy that makes for this embodiment, matrix is rich Cu phase α-Cu (Ni, Si) phase among the figure, silver gray needle-like or sphere are Ni mutually
3Si phase, equally distributed black particle shape are δ-Ni mutually
2The Si phase.
Embodiment 5
Pre-prepared Ni and Si total content are 20wt.%, and all the other are Cu, and wherein the Ni/Si atomic ratio is the Cu-Ni-Si alloy of 3:1, and its operation steps is:
Taking by weighing Ni, Si and the Cu piece of simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, and they are carried out pre-treatment, is that 5% dilute hydrochloric acid solution cleans the removal oxide on surface with concentration first namely, then uses alcohol wash, oven dry; The copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, first at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ rapidly, insulation 10min; Subsequently alloy melt is poured in the graphite casting mould, immediately shrend obtains the Cu-Ni-Si alloy cast ingot to room temperature after the alloy graining demoulding, and cast front mold preheating temperature is 400 ± 20 ℃; The alloy cast ingot that obtains is carried out solution treatment in heat treatment furnace, solid solubility temperature is 900 ℃, and the treatment time is 4h, and shrend is to room temperature subsequently; Ingot casting after the solution treatment is put into argon atmospher protection stove be heated to 1000 ℃, subsequently ingot casting is taken out from stove, carry out classification rolling in temperature is 800-950 ℃ scope, rolling ratio is 16:1, and rolling complete rear shrend is to room temperature; At last the alloy after rolling is put into heat treatment furnace and carry out ageing treatment, aging temp is 500 ℃, and aging time is 8h, and ag(e)ing process is taken out air cooling to room temperature with alloy after finishing from stove, and get final product.
After tested, the specific conductivity of prepared Cu-Ni-Si alloy can reach 25.4IACS%, and tensile strength can reach 807.4MPa.
As shown in Figure 6,200 times of micro-organization charts of the Cu-Ni-Si alloy that makes for this embodiment, matrix is rich Cu phase α-Cu (Ni, Si) phase among the figure, silver gray particulate state or corynebacterium are Ni mutually
3Si phase, equally distributed tiny particulate state are δ-Ni mutually
2The Si phase.
Claims (2)
1. the preparation method of the Cu-Ni-Si alloy of a high Ni, Si content is characterized in that, comprises following operation steps:
Step 1, weighing
Take by weighing Ni, Si and the Cu piece of each simple substance by the weight percent of pre-prepared Cu-Ni-Si alloying constituent, wherein, the total content of Ni and Si is 10%, and all the other are Cu, and the weight percent sum of each composition is 100%, and the atomic ratio of Ni/Si is Ni:Si=2.5:1; Again Ni, Si and Cu piece are carried out pre-treatment removal oxide on surface;
Step 2, melting
First the copper billet that weighs up is put into Medium Frequency Induction Heating Furnace, at 100 ℃ of lower preheating 5min, again Graphite Powder 99 is added to Cu piece surface, then be warming up to 1200 ℃ and make the Cu fusing, after the Ni piece that will take by weighing after Cu melts fully and Si piece add the Cu liquid of melting, temperature is elevated to 1500 ± 20 ℃ again, insulation 10min;
Step 3, cast
The alloy melt that step 2 is obtained pours in the graphite casting mould, the demoulding behind the Cu-Ni-Si alloy graining, and shrend is cooled to room temperature, thus obtaining the Cu-Ni-Si alloy cast ingot, cast front mold preheating temperature is 400 ± 20 ℃;
Step 4, solution treatment
Alloy cast ingot is carried out solution treatment in heat treatment furnace, solid solubility temperature is 1000 ℃, and the treatment time is 2h, takes out subsequently the sample shrend to room temperature;
Step 5, the heat engine tool is processed
The alloy cast ingot that step 4 is prepared is heated to 1000 ℃ in argon atmospher protection stove, after subsequently alloy cast ingot being taken out from stove, be that to carry out classification under 800-950 ℃ the condition rolling in temperature, and final rolling ratio is 16:1, and rolling complete rear shrend is to room temperature;
Step 6, ageing treatment
Rolling good alloy is carried out ageing treatment in heat treatment furnace, aging temp is 500 ℃, and aging time is 8h, takes out air cooling to room temperature after ag(e)ing process finishes, and get final product.
2. the preparation method of described Cu-Ni-Si alloy according to claim 1 is characterized in that, in the described step 1 Ni, Si and Cu piece is carried out pre-treatment: be that 5% dilute hydrochloric acid solution cleans and removes oxide on surface with concentration, then use alcohol wash, oven dry.
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