CN102671946B - Copper aluminum composite board and preparation method thereof - Google Patents
Copper aluminum composite board and preparation method thereof Download PDFInfo
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- CN102671946B CN102671946B CN201110440742.2A CN201110440742A CN102671946B CN 102671946 B CN102671946 B CN 102671946B CN 201110440742 A CN201110440742 A CN 201110440742A CN 102671946 B CN102671946 B CN 102671946B
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Abstract
The invention discloses a preparation method of a copper aluminum composite board, and the method comprises the following steps of: 1) carrying put single-face oil removal and scale removal on copper board strips, and coating a layer of brazing flux, for later use; and 2) oppositely setting the surfaces of the two copper board strips coated with the brazing flux, and injecting semisolid aluminum between the two copper board strips to carry out oxygen-free continuous casting and rolling, so as to obtain the copper aluminum composite board. The preparation method of the copper aluminum composite board comprises the following steps of: preparing the copper aluminum composite board by an oxygen-free continuous casting and rolling method, cleaning the surfaces of the copper strips and coating a layer of the brazing flux before the process of continuously casting and rolling, wherein the liquid aluminum liquid is equal to brazing filler metal in the process of continuously casting and rolling; and carrying out welding after the aluminum liquid is contacted with the copper board strips, wherein the brazing flux coated on the surfaces of the copper board strips can be used for removing residual oxide on the surface of the brazing filler metal (the aluminum liquid) and the copper board strips, improving the wettability between the aluminum liquid and the copper board strips, and improving the seaming quality, so that the bond strength of the copper aluminum composite board can be greatly improved and can reach about 150MPa.
Description
Technical field
The present invention relates to a kind of copper-aluminum composite board, and the preparation method of this copper-aluminum composite board.
Background technology
Copper has good conduction, heat conduction, corrosion resistant and bacteriostasis property, is thus widely used, but the density of copper is large, and price is high, and resource is shorter.And China's bauxite resource is abundanter, the density of aluminium is lower, low price, has become good copper substituting material in a lot of fields.But the conduction of aluminium, heat conductivility are not as copper, welding, arc extinguishing, the performance such as wear-resisting are also poor, therefore in some occasion, as product scopes such as switch, fin, rebounds, with aluminium directly alternative copper be difficult.At present, a kind of copper aluminum bronze 3-layer composite material combining the high stability of copper and the advantage of low cost of aluminium instead of fine copper or pure aluminum material gradually, with the combination property that it is special, be widely used in electric power, heat transfer, military project, electronic computer, electric elements, aerospace field, automobile and the every field such as civilian.
At present, Gu the manufacturing process of copper aluminum bronze 3-layer composite material is solid-complex method mainly, produced by rolling by crimping, tube-weld cladding technique, explosion composite algorithm, composite ingot Hot rolling, continuously extruded welding etc., there is the shortcomings such as complex manufacturing, production cost is high, efficiency is low, combined strength bination is low.Gu also there is employing liquid-complex method, liquid state or semisolid aluminum or aluminum alloy and solid-state copper coin are carried out anaerobic continuous casting and rolling, obtained Copper-Aluminum compound strip.CN101758071 discloses the production method of a kind of aluminium and copper composite metal band, adopts the method for anaerobic continuous casting and rolling to prepare Copper-Aluminum compound strip.The method needs to carry out polishing to non-oxidation layer online before Cu and Al combination, and technics comparing is complicated, and the bond strength of copper aluminium lower (about 100MPa).
Summary of the invention
The object of this invention is to provide a kind of preparation method of copper-aluminum composite board, save step of polishing online, simplify preparation section, improve the bond strength of copper-aluminum composite board simultaneously.
In order to realize above object, the technical solution adopted in the present invention is: a kind of preparation method of copper-aluminum composite board, and its step is as follows:
1) copper plate/strip carried out one side oil removing and descale, coating one deck brazing flux, for subsequent use;
2) surface two copper plate/strips being coated with brazing flux is oppositely arranged, and injects semi-solid aluminium and carries out anaerobic continuous casting and rolling, obtain copper-aluminum composite board between two copper plate/strips.
Described brazing flux by mass ratio be 4: 6 ~ 7: 3 stripper and activating agent form.
Described stripper is potassium fluoborate.
Described activating agent is boric anhydride.
Step 1) described before copper plate/strip surface coating brazing flux, the binding agent of brazing flux and its weight 4% ~ 15% and 30% ~ 50% solvent are mixed, dries after coating.
Described binding agent is acrylic resin or butadiene resin.
Described solvent is acetone or methyl acetate.
The thickness of described coating brazing flux is 0.01 ~ 0.05mm.
The volume under pressure of rolling during described continuous casting and rolling is 40% ~ 60%.
The preparation method of copper-aluminum composite board of the present invention, the method of anaerobic continuous casting and rolling is adopted to prepare copper-aluminum composite board, before continuous casting and rolling, copper strip surface cleared up and scribble one deck brazing flux, when continuous casting and rolling, the aluminium liquid of liquid state is equivalent to solder, welding is realized after aluminium liquid contacts with copper plate/strip, the brazing flux being coated in copper plate/strip surface can remove the residual oxide on solder (aluminium liquid) and copper plate/strip surface, improve the wetability of aluminium liquid and copper plate/strip, improve welding quality, thus the bond strength of copper-aluminum composite board is improved greatly, can about 150MPa be reached.Copper plate/strip can carry out protection against oxidation to copper plate/strip oil removing and the surface descaled after coating brazing flux in addition.
Accompanying drawing explanation
Fig. 1 is the structural representation of casting apparatus in embodiment.
Detailed description of the invention
Embodiment 1
The copper-aluminum composite board of the present embodiment is adopted and is prepared with the following method:
1) potassium fluoborate stripper and boric anhydride activating agent is taken respectively in the ratio of 7: 3, obtained 100kg brazing flux powder after mixing; Add acrylic resin 10Kg as binding agent, object can form brazing flux film on copper plate/strip surface, then add 30Kg acetone, stirs and make brazing flux slurry, for subsequent use;
2) copper plate/strip carried out one side oil removing and descale, coating brazing flux slurry, after acetone volatilization, forming the brazing flux film that a layer thickness is 0.01 ~ 0.05mm, the mode of spraying can be adopted;
3) the painting brazing flux surface of two copper plate/strips is oppositely arranged, between two copper plate/strips, inject semi-solid aluminium carry out on-line continuous soldering, brazing flux at high temperature melted and reacted with a small amount of residual oxide on faying face and removed, to ensure its welding quality period; Complex travels forward and carries out continuous casting and rolling, and the volume under pressure of rolling is 60%, obtains Copper-Aluminum compound strip, Copper-Aluminum compound strip is batched after naturally cooling 1 ~ 5min.
The bond strength of the copper-aluminum composite board obtained is 150MPa.
Continuous casting and rolling can adopt conventional anaerobic continuous casting and rolling device to carry out, also casting apparatus as shown in Figure 1 can be adopted to carry out anaerobic continuous casting and rolling: this device comprises the reservoir 2 for storing aluminium liquid 1, the bottom of this reservoir 2 is communicated with a continuous casting guide groove 8, this guide groove 8 along Continuous Casting Square to company side be provided with baffle plate (not shown).At guide groove 8, pre-heated godet roll 4 and lower pre-heated godet roll 9 are set up and down respectively, upper pre-heated godet roll 4 and lower pre-heated godet roll 9 on continuous casting direct of travel before and after arrange; Offer the strip crevice inserted for lower copper plate/strip 10 near the position of lower pre-heated godet roll 9 bottom guide groove 8, the top of guide groove is provided with a bit of towards the acclivitous gear edge of continuous casting direct of travel, front end and the upper pre-heated godet roll 4 on this gear edge are tangent, be reserved with the strip crevice inserted for upper copper plate/strip 3 equally, and tangent position is higher than the minimum point of pre-heated godet roll 4.The water-cooled roll 5,7 being provided with setting in pairs foremost of guide groove 8, for being rolled complex, obtains copper-aluminum composite board 6 after rolling.
During work, upper copper plate/strip 3 and lower copper plate/strip 10 are oppositely arranged with the surface of brazing flux, brought in guide groove 8 by upper pre-heated godet roll 4 and lower pre-heated godet roll 9 respectively, be preheated to 350 ~ 400 DEG C, by aluminium liquid through degasification and after leaving standstill, in 690 ~ 730 DEG C of continuous and quantitatives are injected between two copper plate/strips simultaneously, aluminium liquid makes the brazing flux on copper plate/strip surface melt, remove the oxide of contact surface, improve aluminium liquid to copper plate/strip wettability of the surface, the good fusion realized between the two forms complex plate strip; Remaining brazing flux and and remove the product after oxide swims in aluminium liquid surface because density is less, binding agent also can be overflowed after heating and gasifying, due to guide groove a bit of gear along be inclined upwardly and also point of contact higher than the minimum point of upper pre-heated godet roll 4, product can swim in aluminium liquid surface, can not enter in copper-aluminum composite board thereupon.Aluminium liquid is to while copper plate/strip heating, and aluminium liquid enters half curdled appearance fast, and the roll that semisolid-state clad plate band enters band cooling device is subsequently rolled, and below the solid state temperature being reduced to aluminium, obtains the Copper-Aluminum compound strip of desired thickness.
Embodiment 2
The copper-aluminum composite board of the present embodiment is adopted and is prepared with the following method:
1) potassium fluoborate stripper and boric anhydride activating agent is taken respectively in the ratio of 5: 4, obtained 100kg brazing flux powder after mixing; Add acrylic resin 15Kg as binding agent, object can form brazing flux film on copper plate/strip surface, then add 40Kg acetone, stirs and make brazing flux slurry, for subsequent use;
2) copper plate/strip carried out one side oil removing and descale, coating brazing flux slurry, after acetone volatilization, forming the brazing flux film that a layer thickness is 0.01 ~ 0.05mm;
3) the painting brazing flux surface of two copper plate/strips is oppositely arranged, between two copper plate/strips, injects semi-solid aluminium carry out on-line continuous soldering, period brazing flux at high temperature react with a small amount of residual oxide on faying face and removed, to ensure its welding quality; Complex travels forward and carries out continuous casting and rolling, and the volume under pressure of rolling is 40%, obtains Copper-Aluminum compound strip, Copper-Aluminum compound strip is batched after naturally cooling 1 ~ 5min.
The bond strength of the copper-aluminum composite board obtained is 147MPa.
The anaerobic continuous casting and rolling device that the present embodiment adopts is identical with embodiment 1.
Embodiment 3
The copper-aluminum composite board of the present embodiment is adopted and is prepared with the following method:
1) potassium fluoborate stripper and boric anhydride activating agent is taken respectively in the ratio of 4: 6, obtained 100kg brazing flux powder after mixing; Add butadiene resin 4Kg as binding agent, object can form brazing flux film on copper plate/strip surface, then add 50Kg ethyl acetate, stirs and make brazing flux slurry, for subsequent use;
2) copper plate/strip carried out one side oil removing and descale, coating brazing flux slurry, after acetone volatilization, forming the brazing flux film that a layer thickness is 0.01 ~ 0.05mm;
3) the painting brazing flux surface of two copper plate/strips is oppositely arranged, between two copper plate/strips, injects semi-solid aluminium carry out on-line continuous soldering, period brazing flux at high temperature react with a small amount of residual oxide on faying face and removed, to ensure its welding quality; Complex travels forward and carries out continuous casting and rolling, and the volume under pressure of rolling is 50%, obtains Copper-Aluminum compound strip, Copper-Aluminum compound strip is batched after naturally cooling 1 ~ 5min.
The bond strength of the copper-aluminum composite board obtained is 154MPa.
The anaerobic continuous casting and rolling device that the present embodiment adopts is identical with embodiment 1.
It should be noted that, specific embodiments of the invention only for illustration of and non-limiting technical scheme of the present invention, the brazing flux of the releasing agent wherein used in embodiment and activating agent composition is a kind of optimum choice of the present invention, but other brazing flux liquid of other applicable copper and aluminium can play the effect of deoxygenation equally, also object of the present invention should can be realized.
Claims (9)
1. a preparation method for copper-aluminum composite board, is characterized in that: its step is as follows:
1) copper plate/strip carried out one side oil removing and descale, coating one deck brazing flux, for subsequent use;
2) surface two copper plate/strips being coated with brazing flux is oppositely arranged, and injects semi-solid aluminium and carries out anaerobic continuous casting and rolling, obtain copper-aluminum composite board between two copper plate/strips;
Step 1) described before copper plate/strip surface coating brazing flux, the binding agent of brazing flux and its weight 4% ~ 15% and 30% ~ 50% solvent are mixed, dries after coating.
2. the preparation method of copper-aluminum composite board according to claim 1, is characterized in that: described brazing flux is that the stripper of 4:6 ~ 7:3 and activating agent form by mass ratio.
3. the preparation method of copper-aluminum composite board according to claim 2, is characterized in that: described stripper is potassium fluoborate.
4. the preparation method of copper-aluminum composite board according to claim 2, is characterized in that: described activating agent is boric anhydride.
5. the preparation method of copper-aluminum composite board according to claim 1, is characterized in that: described binding agent is acrylic resin or butadiene resin.
6. the preparation method of copper-aluminum composite board according to claim 1, is characterized in that: described solvent is acetone or methyl acetate.
7. the preparation method of copper-aluminum composite board according to claim 1, is characterized in that: the thickness of described coating brazing flux is 0.01 ~ 0.05mm.
8. the preparation method of copper-aluminum composite board according to claim 1, is characterized in that: the volume under pressure of rolling during described continuous casting and rolling is 40% ~ 60%.
9. one kind adopt as claim 1 preparation method the copper-aluminum composite board that obtains.
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| CN201110440742.2A CN102671946B (en) | 2011-12-25 | 2011-12-25 | Copper aluminum composite board and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110440742.2A CN102671946B (en) | 2011-12-25 | 2011-12-25 | Copper aluminum composite board and preparation method thereof |
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| CN102671946A CN102671946A (en) | 2012-09-19 |
| CN102671946B true CN102671946B (en) | 2015-01-21 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103143565B (en) * | 2013-04-03 | 2015-11-11 | 郑州市合力铜业有限公司 | A kind of production technology of copper-aluminum bimetal composite plate |
| CN103722139A (en) * | 2013-09-26 | 2014-04-16 | 河南科技大学 | Semi-solid slurrying device and composite board manufacturing device using semi-solid slurrying device |
| CN103537483B (en) * | 2013-10-16 | 2016-02-03 | 河南科技大学 | A kind of preparation method of Copper-Aluminum compound strip and complex plate strip casting apparatus |
| CN106238904B (en) * | 2016-08-30 | 2018-11-20 | 郑州机械研究所有限公司 | A kind of activation diffusion connection method of hard alloy and steel |
| CN106271230A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of coating silver solder and preparation method thereof |
| CN108160708B (en) * | 2018-01-18 | 2019-03-22 | 燕山大学 | A kind of casting and rolling device and method of double-level-metal composite plate of the quick preparation with coating sandwich |
| CN109261915A (en) * | 2018-09-21 | 2019-01-25 | 浙江京良新材料科技有限公司 | A kind of Copper-Aluminum compound band production technology |
| CN112605121B (en) * | 2020-12-30 | 2023-03-17 | 郑州金辉新能源电子材料有限公司 | Copper-aluminum composite foil for PCB and preparation process thereof |
| CN112779482A (en) * | 2020-12-31 | 2021-05-11 | 洛阳铜一金属材料发展有限公司 | Metal plate of copper-aluminum composite high-strength steel wire and preparation method thereof |
| CN114101332B (en) * | 2021-11-19 | 2022-07-08 | 河南铜创有色金属科技有限公司 | Method for manufacturing copper-aluminum composite strip by using solid copper and liquid aluminum |
| CN114700479B (en) * | 2022-04-24 | 2023-06-30 | 连云港中彩科技有限公司 | Continuous casting semi-molten rolled copper-aluminum composite plate strip and production process thereof |
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| CN1186137C (en) * | 2000-06-19 | 2005-01-26 | 东北大学 | Rolling method and apparatus for combining liquid-solid heterometals |
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