CN102586774A - Metal matrix composite material sintering weldable layer and presetting method - Google Patents
Metal matrix composite material sintering weldable layer and presetting method Download PDFInfo
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- CN102586774A CN102586774A CN2012100319681A CN201210031968A CN102586774A CN 102586774 A CN102586774 A CN 102586774A CN 2012100319681 A CN2012100319681 A CN 2012100319681A CN 201210031968 A CN201210031968 A CN 201210031968A CN 102586774 A CN102586774 A CN 102586774A
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Abstract
Provided are a metal matrix composite material sintering weldable layer and a presetting method. The metal matrix composite material sintering weldable layer is characterized by being composed of 2%-5% of organic adhesives, 20%-25% of organic solvents and 5%-8% of brazing flux by weight, and the balance weldable metal powder. The materials are stirred, fully mixed and grinded for 40-60 hours to form colloidal mixture, the mixture is then coated on the welding surface of an element made of composite materials, sintered within a temperature segment ranging from 100 DEG C to 500 DEG C by sections and then discharged out of a furnace after heat preservation and cooling. The metal matrix composite material sintering weldable layer has the advantages of being capable of being directly performed with tin brazing soldering or electric resistance welding. The technology is simple and convenient to operate, the quality can be controlled easily, and yield rate is high. The compact and firm weldable metal layer is formed on the surface of the composite materials in sintering mode, the organic solvents, the organic adhesives and the brazing flux adopted in the component are fully decomposed and volatilized in the sintering process with no residues, tin brazing soldering or electric resistance welding are conducted directly, and the welding is firm and reliable.
Description
Technical field
The present invention is last to relate to Welder's field of engineering technology, but particularly relates to weldability relatively poor metal-base composites burning infiltration layer and pre-setting method.
Background technology
But the method that presets the metal-base composites layer commonly used at present has following shortcoming:
1, decarburization.So-called decarburization is as far as graphitiferous matrix material, promptly is that graphitiferous matrix material is heated in the atmosphere of air or aerobic, makes graphite and oxidation (C+O
2=CO
2) become carbonic acid gas to vapor away, but and form the metal layer, but because the degree of decarburization, temperature, difficult grasp of time, very difficulty operates.Can't protect simultaneously because of non-face of weld, also can be by decarburization, and the temperature of decarburization is crossed high factor, all can cause the performance of matrix material itself to be affected.
But 2, plating layer.Promptly be to use electric plating method, plate the metal level (like silver, copper etc.) that one deck can weld at the face of weld of matrix material.Because most of matrix materials all are sintered metal products---all there is micro pores; Have corrosive electroplate liquid during plating and can infiltrate inevitably in the hole and can't discharge, cause various performances such as the electroconductibility of matrix material, anti-storage property all can be had a strong impact on.
3, coat bondable metal layer at face of weld.Promptly be when pressed powder metallurgy matrix material, in face of weld presuppression one deck bondable metal layer.But the thickness of this bondable metal layer, homogeneity and bonding strength are difficult to control; Simultaneously in sintering process; Because the material of goods is made up of two-layer differing materials (pure metal layer and composite layer); Its coefficient of expansion is different, thereby very easily causes phenomenons such as material gross distortion, cracking, and yield rate is very low.
Summary of the invention
The present invention is exactly the shortcoming that exists to aforesaid method, but a kind of metal-base composites burning infiltration layer and pre-setting method that can form fine and close, the firm bondable metal layer of one deck at the face of weld of matrix material is provided.
Solution of the present invention is such: but metal layer of the present invention is made up of the following raw material that contains weight percent: and organic binder bond 2% to 5%, organic solvent 20% to 25%, brazing flux 5% to 8%, surplus is the weldability metal-powder.
The more detailed technical scheme of said components is: described weldability metal-powder is silver powder or copper powder; Described organic binder bond is epoxy resin or resol; Described organic solvent is absolute ethyl alcohol or benzene; Described brazing flux is fluorochemical or boride.
The step of pre-setting method of the present invention comprises:
The following raw material that (1), will contain weight percent: organic binder bond 2% to 5%, organic solvent 20% to 25%, brazing flux 5% to 8%; Surplus is ground 40 ~ 60h for the preparation of weldability metal-powder and after stirring thorough mixing; Form colloidal mixture, then its mixture is coated in the face of weld of composite component;
(2), carry out burning infiltration, through insulation 100 ℃ to 500 ℃ temperature section segmentations---come out of the stove after the cooling.
In step (1), also comprise the steps: the matrix material process step that degreases; The described step that degreases is that matrix material boils in the solution that contains 10% NaOH after 12-20 minute and uses flushing with clean water; Boil repeatedly to PH7 ~ PH8 with clear water; The citric acid solution of adding 1% boiled 12-20 minute, with the remaining alkali that neutralizes, repeatedly was flushed to PH7 with clear water again; Take out oven dry, then its mixture is coated in the face of weld of composite component.
In step (2), in resistance furnace, carrying out the burning infiltration method steps is: insulation stops heating in being incubated 20-30 minute → 480 ℃-520 ℃ in being incubated 12-20 minute → 190 ℃-210 ℃ in 90 ℃-110 ℃ after 25-35 minute.
Be that the refrigerative method steps is come out of the stove for after cooling to room temperature with the furnace in step (2).
Advantage of the present invention is that this bondable metal layer can directly be carried out tin soldering or resistance welding.This technological operation is simple and convenient, system easy to control the quality, and yield rate is high.Because what adopt in this partition is organic solvent, organic binder bond brazing flux; In the burning infiltration process, fully decompose volatilization, do not have any residue, the top temperature of burning infiltration is merely about 500 ℃; And burning infiltration liquid only is to carry out at the face of weld that scribbles mixture; Other non-face of weld (like the workplace of matrix material) is all uninfluenced, so the original performance of each item of matrix material all remains unchanged, the densification that forms through burning infiltration at composite material surface, firm bondable metal layer; Can directly carry out tin soldering or resistance welding, firm welding, reliable.
Description of drawings
Accompanying drawing is embodiments of the invention.
Accompanying drawing 1 is a process flow sheet of the present invention.
Embodiment
But layer embodiment of the present invention is:
But described metal layer is made up of the following raw material that contains weight percent: organic binder bond 2% to 5%, organic solvent 20% to 25%, brazing flux 5% to 8%, surplus is the weldability metal-powder.
Described weldability metal-powder is silver powder or copper powder; Described organic binder bond is epoxy resin or resol; Described organic solvent is absolute ethyl alcohol or benzene; Described brazing flux is fluorochemical or boride.
The pre-setting method that is undertaken by the foregoing description is:
With weight percent organic binder bond 2% to 5%, organic solvent 20% to 25%, brazing flux 5% to 8%, surplus is ground 40 ~ 60h for the preparation of weldability metal-powder and after stirring thorough mixing, forms colloidal mixture;
Matrix material boiled in the solution that contains 10% NaOH repeatedly wash with clear water after 15 minutes, boil repeatedly to PH7 ~ PH8, add 1% citric acid solution and boiled 15 minutes, with the remaining alkali that neutralizes, repeatedly be flushed to PH7 with clear water again, oven dry with clear water;
Then its mixture is coated in the face of weld of composite component after the abatement processes;
In resistance furnace, carry out burning infiltration, stop heating after 100 ℃ (being incubated 15 minutes) → 200 ℃ (being incubated 25 minutes) → 500 ℃ (being incubated 30 minutes); Come out of the stove after cooling to room temperature with the furnace.
Specific embodiment:
The high-accuracy small and special electric machine brush of certain type, the basic matrix material of the metal of its use is silver-colored graphite (AgC) and the thick berylliumbronze shell fragment welding of 0.1mm.This workpiece then owing to contain graphite in the AgC material, to the non-constant of the wettability of tin solder, can't weld as if the method with direct tin soldering at all.And but but employing methods such as decarburization, plating layer and coating layer commonly used then owing to the various shortcoming of these methods existence, also yield." but metal-base composites burning infiltration layer and pre-setting method " of my company's independent research at last successfully solved the shortcoming that above-mentioned process method exists, and the mode of practical implementation is: 1, at first to the processing that degreases of silver-colored graphite (AgC) material original paper.1. step joins original paper boiled in the 10%NaOH solution 15 minutes.2. step is taken out the back with original paper and is repeatedly washed with clear water.3. step is used clear water to boil repeatedly to be PH7 ~ PH8 until boiling water.4. step adds 1% citric acid solution boiled 15 minutes, with the remaining alkali that neutralizes.5. step repeatedly washes with clear water again, till the flushing clear water is PH7, takes out element and dries for use.2, preparation burning infiltration material.1. step fully mixes weldability metal-powder (being generally silver powder or copper powder)+organic solvent (absolute ethyl alcohol or benzene)+organic binder bond (epoxy resin or resol)+brazing flux (boride or fluorochemical).The present invention is preferably: organic solvent is 25% absolute ethyl alcohol; Organic binder bond is 2.5% resol; Brazing flux is 6% boride; The metal-powder of surplus is a silver powder.2. step grinds 40h ~ 60h with the mixture that configures on ball mill.3, the burning infiltration material blends is coated on the face of weld of silver-colored graphite component of the oven dry that degreased equably.4, burning infiltration.With the element of coating the burning infiltration material heat temperature raising in the resistance furnace of packing into.The preferred segmentation burning infiltration of the present invention temperature is: insulation is 15 minutes in the time of 100 ℃, and insulation is 20 minutes in the time of 200 ℃, and insulation is 30 minutes in the time of 500 ℃, stops heating then, comes out of the stove after cooling to room temperature with the furnace.Use the silver layer of this method in the burning infiltration of AgC material face of weld, use microscopic examination, this silver layer is evenly fine and close and firm, and is very good to the wettability of tin solder.We carry out tin soldering welding with the berylliumbronze shell fragment with this AgC material elements after burning infiltration is handled for this reason.And finished product has been carried out the soldered shearing resistance tested, experimental result shows that this weld seam degree of shear reaches 5.6N/mm
2, substantially exceeded user's requirement (0.32N/mm
2).We are applied to Ag-C-MOS with this technological expansion again later on
2, Ag-C-WS
2In the welding in matrix material, all obtain satisfied effect.
Claims (8)
- But 1. metal-base composites burning infiltration layer, but it is characterized in that described metal layer is made up of the following raw material that contains weight percent: and organic binder bond 2% to 5%, organic solvent 20% to 25%, brazing flux 5% to 8%, surplus is the weldability metal-powder.
- 2. but metal-base composites burning infiltration layer according to claim 1 is characterized in that described weldability metal-powder is silver powder or copper powder.
- 3. but metal-base composites burning infiltration layer according to claim 1 is characterized in that described organic binder bond is epoxy resin or resol.
- 4. but metal-base composites burning infiltration layer according to claim 1 is characterized in that described organic solvent is absolute ethyl alcohol or benzene.
- 5. but metal-base composites burning infiltration layer according to claim 1 is characterized in that described brazing flux is fluorochemical or boride.
- 6. but the pre-setting method of a metal-base composites burning infiltration layer is characterized in that its method steps comprises:The following raw material that (1), will contain weight percent: organic binder bond 2% to 5%, organic solvent 20% to 25%, brazing flux 5% to 8%; Surplus is ground 40 ~ 60h for the preparation of weldability metal-powder and after stirring thorough mixing; Form colloidal mixture, then its mixture is coated in the face of weld of composite component;(2), carry out burning infiltration, through insulation 100 ℃ to 500 ℃ temperature section segmentations---come out of the stove after the cooling.
- 7. but the pre-setting method of metal-base composites burning infiltration layer according to claim 6 is characterized in that in step (2), in resistance furnace, carrying out the burning infiltration method steps and is: in 90 ℃-110 ℃ in 12-20 minute → 190 ℃-210 ℃ of the insulations in 20-30 minute → 480 ℃-520 ℃ of the insulations insulation stop heating after 25-35 minute.
- 8. but the pre-setting method of metal-base composites burning infiltration layer according to claim 6 is characterized in that the refrigerative method steps is come out of the stove for after cooling to room temperature with the furnace in step (2).
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| CN2012100319681A CN102586774A (en) | 2012-02-14 | 2012-02-14 | Metal matrix composite material sintering weldable layer and presetting method |
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| CN2012100319681A CN102586774A (en) | 2012-02-14 | 2012-02-14 | Metal matrix composite material sintering weldable layer and presetting method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064637A (en) * | 1991-03-14 | 1992-09-23 | 中国有色金属工业总公司昆明贵金属研究所 | The method for welding of money base soldering paste and Silver Jewelry |
| CN1064636A (en) * | 1991-03-14 | 1992-09-23 | 中国有色金属工业总公司昆明贵金属研究所 | The method for welding of copper base soldering paste and copper-made ornament |
| CN1125412A (en) * | 1993-06-15 | 1996-06-26 | 莱克泽技术有限公司 | A method of brazing |
| US20020023947A1 (en) * | 2000-08-28 | 2002-02-28 | Nobuhide Kimura | Method of brazing metal work |
| CN101637838A (en) * | 2009-08-20 | 2010-02-03 | 江西恒大高新技术股份有限公司 | Method for preparing tungsten carbide abrasion resistant composite coating by penetration brazing method |
-
2012
- 2012-02-14 CN CN2012100319681A patent/CN102586774A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064637A (en) * | 1991-03-14 | 1992-09-23 | 中国有色金属工业总公司昆明贵金属研究所 | The method for welding of money base soldering paste and Silver Jewelry |
| CN1064636A (en) * | 1991-03-14 | 1992-09-23 | 中国有色金属工业总公司昆明贵金属研究所 | The method for welding of copper base soldering paste and copper-made ornament |
| CN1125412A (en) * | 1993-06-15 | 1996-06-26 | 莱克泽技术有限公司 | A method of brazing |
| US20020023947A1 (en) * | 2000-08-28 | 2002-02-28 | Nobuhide Kimura | Method of brazing metal work |
| CN101637838A (en) * | 2009-08-20 | 2010-02-03 | 江西恒大高新技术股份有限公司 | Method for preparing tungsten carbide abrasion resistant composite coating by penetration brazing method |
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Application publication date: 20120718 |