CN104259466A - Method for connecting copper-based power metallurgy composite materials and steel - Google Patents
Method for connecting copper-based power metallurgy composite materials and steel Download PDFInfo
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- CN104259466A CN104259466A CN201410556844.4A CN201410556844A CN104259466A CN 104259466 A CN104259466 A CN 104259466A CN 201410556844 A CN201410556844 A CN 201410556844A CN 104259466 A CN104259466 A CN 104259466A
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Abstract
Disclosed is a method for connecting copper-based power metallurgy composite materials and steel. The method for connecting the copper-based power metallurgy composite materials and the steel belongs to the field of dissimilar material melting and diffusion bonding and solves the problem of high-strength connection between the copper-based power metallurgy composite materials and dissimilar steel materials. The method comprises performing sand blasting, punch forming and copper plating on low-carbon steel, wherein the copper plating thickness is 0.05-0.75 mm; performing punch forming on composite powder, which contain copper powder, iron powder, graphite powder and ceramic powder, inside a mould, wherein the thickness of the mixed powder ranges 1-1.5 mm; laminating mould-punched blocks with adhesives and steel backings coated with copper-based metal powder, and performing sintering at a pressure of 2-6 MPa and at 850-950 DEG C for 1-2 hours to achieve high-strength connection between the copper-based powder metallurgy friction materials and the steel backings.
Description
technical field:
The present invention relates to a kind of method of attachment of foreign material, particularly relate to the method for attachment of a kind of copper-base powder metallurgy composite and steel, belong to foreign material fusing diffusion connection area.
background technology:
Brake block is the critical component of bullet train, and its performance quality directly determines safety in operation and the driving comfort of train.Copper-base powder metallurgy brake block, because of high-termal conductivity, high stability, higher wearability and environment friendly, is the general braking brake material of the above bullet train of current Speed 200 km/h.
For guaranteeing the coefficient of friction that friction material meets the demands and higher wearability, in copper based powder metallurgy friction material except comprising the Reinforced by Metal such as copper powder and iron powder composition, relatively large lubricant component graphite powder must be comprised and increase mill constituent element ceramic powder, all powders, through Homogeneous phase mixing, compression molding, sintering densification, form composite friction material.But this friction material limited strength comprising a large amount of graphite and ceramic constituent element, is used alone load deficiency, and bring assembling difficulty and braking to damage, need with Steel material as supporting back board, i.e. steel backing.In order to ensure high-termal conductivity and the use procedure security reliability of brake block, friction material and steel backing need closed seamless high strength to be connected.Because composite friction material and steel backing difference in physical property, hot expansibility is huge, conventional riveted joint, solder technology are all inapplicable.
For this reason, the present invention adopts hot pressing to melt Diffusion bonding techniques connection copper based powder metallurgy friction material and steel backing, is reduced the thermal expansion coefficient difference of two kinds of connecting materials, prevent thermal stress-cracking by the intermediate layer added containing copper iron component, thus raising bonding strength, guarantee brake safe.
summary of the invention:
The object of the invention is to solve high strength connectivity problem between copper-base powder metallurgy composite and steel foreign material.
The method of attachment of copper-base powder metallurgy composite and steel, comprises the following steps:
Step one, by include copper powder, iron powder, graphite powder, ceramic powder composite granule make type at mould inner pressure, obtain die briquetting, wherein copper powder content accounts for the 45-55% of composite powder gross mass, iron content accounts for the 25-35% of composite powder gross mass, graphite powder content accounts for the 10-15% of composite powder gross mass, and ceramic powder content accounts for the 1-5% of composite powder gross mass; Organic binder bond is spread at the joint face edge of die briquetting;
Step 2, blasting treatment is carried out to steel backing; Carry out copper facing to the steel backing after process, thickness of coating is at 0.05-0.75 millimeter;
Step 3, to copper plated steel back paving spill containing copper, iron and other low-melting-point metal powder, formed intermediate layer, thickness is in 1-1.5 millimeter scope;
Step 4, the die briquetting scribbling bonding agent and the steel backing that scribbles intermediate layer to be stacked, in clock hood type furnace, sinter 1-2 hour at 2-6MPa pressure, 850-950 DEG C temperature, realize copper based powder metallurgy friction material and be connected with the high strength of steel backing.
Described copper-base powder metallurgy composite and the method for attachment of steel, is characterized in that: described copper-plated thickness is 0.05-0.75 millimeter.
Described intermediate layer powder comprises other low-melting-point metal powder of copper powder, 25%-35% iron powder and 10%-20% that mass fraction is 45%-65%.
The joint face edge of described die briquetting spreads the epoxy resin acetone soln that organic adhesive is concentration 30%.
Other described low-melting-point metal powder are the metal powder of fusing point lower than copper fusing point.
First by include copper powder, iron powder, graphite powder, ceramic powder composite granule make type at mould inner pressure, obtain die briquetting.Spread the epoxy resin acetone organic binder bond of 30% concentration at the joint face edge of die briquetting, be convenient to bonding with steel backing, what be also convenient to bond pad moves transfer; Adopt the steel such as Q195, Q235 steel or 16Mn as steel backing material, to steel backing blasting treatment, make steel backing surface obtain certain cleannes and roughness, and improve its mechanical performance; Carry out copper facing to the steel backing after process, thickness of coating is in 0.05-0.75 millimeter scope; Spread the alloyed powder spilt containing copper, iron and other low-melting-point metals to copper plated steel back, form intermediate layer, thickness is in 1-1.5 millimeter scope; The die briquetting scribbling bonding agent is stacked with the steel backing scribbling intermediate layer, in clock hood type furnace, sinters 1-2 hour at 2-6MPa pressure, 850-950 DEG C temperature, realize copper based powder metallurgy friction material and be connected with the high strength of steel backing.
The fine and close flawless of the linkage interface adopting above-mentioned process to be formed, test through shearing test, break in friction material instead of linkage interface place, show that the bonding strength of bi-material is higher than friction material intensity, bonding strength between 11.22 MPa-19.35 MPa, far above 4.5 MPa of instructions for use.
detailed description of the invention:
Embodiment 1:
First by include copper powder, iron powder, graphite powder, ceramic powder composite granule mix with the rotating speed of 60 revs/min at V-type batch mixer according to a certain percentage.Mixed powder makes type at 400MPa pressure, obtains die briquetting.The epoxy resin acetone organic binder bond of 30% concentration is spread at the joint face edge of die briquetting.Q195 steel (phosphorus content is 0.07%-0.12%) is adopted to make steel backing; To steel backing blasting treatment, make steel backing surface obtain certain cleannes and roughness, and improve its mechanical performance; Carry out copper facing to the steel backing after process, thickness of coating is at 0.45 millimeter.Be the copper powder of 45%, 35% iron powder, 20% low-melting-point metal powder mixing by composition, uniform spreading is sprinkled upon copper plated steel back, forms intermediate layer, intermediate layer thickness 1 millimeter.Afterwards, the die briquetting scribbling bonding agent is stacked with the steel backing scribbling intermediate layer; In clock hood type furnace, sinter 1 hour under protection of reducing atmosphere, 2MPa pressure, 850 DEG C of temperature, the bonding strength of gained copper-base powder metallurgy brake material is 11.22 MPa.
Embodiment 2:
First by include copper powder, iron powder, graphite powder, ceramic powder composite granule mix with the rotating speed of 60 revs/min at V-type batch mixer according to a certain percentage.Mixed powder makes type at 400MPa pressure, obtains die briquetting.The epoxy resin acetone organic binder bond of 30% concentration is spread at the joint face edge of die briquetting.Q235 steel (phosphorus content is 0.12%-0.22%) is adopted to make steel backing; To steel backing blasting treatment, make steel backing surface obtain certain cleannes and roughness, and improve its mechanical performance; Carry out copper facing to the steel backing after process, thickness of coating is at 0.45 millimeter.Be the copper powder of 50%, 33% iron powder, 17% low-melting-point metal powder mixing by composition, uniform spreading is sprinkled upon copper plated steel back, forms intermediate layer, intermediate layer thickness 1.2 millimeters.Afterwards, the die briquetting scribbling bonding agent is stacked with the steel backing scribbling intermediate layer; In clock hood type furnace, sinter 1.2 hours under protection of reducing atmosphere, 3MPa pressure, 890 DEG C of temperature, the bonding strength of gained copper-base powder metallurgy brake material is 14.51 MPa.
Embodiment 3:
First by include copper powder, iron powder, graphite powder, ceramic powder composite granule mix with the rotating speed of 60 revs/min at V-type batch mixer according to a certain percentage.Mixed powder makes type at 400MPa pressure, obtains die briquetting.The epoxy resin acetone organic binder bond of 30% concentration is spread at the joint face edge of die briquetting.16Mn steel (phosphorus content is 0.1%-0.23%) is adopted to make steel backing; To steel backing blasting treatment, make steel backing surface obtain certain cleannes and roughness, and improve its mechanical performance; Carry out copper facing to the steel backing after process, thickness of coating is at 0.45 millimeter.Be the copper powder of 60%, 30% iron powder, 10% low-melting-point metal powder mixing by composition, uniform spreading is sprinkled upon copper plated steel back, forms intermediate layer, intermediate layer thickness 1.3 millimeters.Afterwards, the die briquetting scribbling bonding agent is stacked with the steel backing scribbling intermediate layer; In clock hood type furnace, sinter 1.5 hours under protection of reducing atmosphere, 4MPa pressure, 920 DEG C of temperature, the bonding strength of gained copper-base powder metallurgy brake material is 18.4 MPa.
Embodiment 4:
First by include copper powder, iron powder, graphite powder, ceramic powder composite granule mix with the rotating speed of 60 revs/min at V-type batch mixer according to a certain percentage.Mixed powder makes type at 400MPa pressure, obtains die briquetting.The epoxy resin acetone organic binder bond of 30% concentration is spread at the joint face edge of die briquetting.430 (0Cr17) ferritic stainless steel (phosphorus content is 0.08%-0.12%) is adopted to make steel backing; To steel backing blasting treatment, make steel backing surface obtain certain cleannes and roughness, and improve its mechanical performance; Carry out copper facing to the steel backing after process, thickness of coating is at 0.45 millimeter.Be the copper powder of 65%, 25% iron powder, 10% low-melting-point metal powder mixing by composition, uniform spreading is sprinkled upon copper plated steel back, forms intermediate layer, intermediate layer thickness 1.5 millimeters.Afterwards, the die briquetting scribbling bonding agent is stacked with the steel backing scribbling intermediate layer; In clock hood type furnace, sinter 2 hours under protection of reducing atmosphere, 6MPa pressure, 950 DEG C of temperature, the bonding strength of gained copper-base powder metallurgy brake material is 19.35 MPa.
Claims (5)
1. a method of attachment for copper-base powder metallurgy composite and steel, is characterized in that:
Step one, by include copper powder, iron powder, graphite powder, ceramic powder composite granule make type at mould inner pressure, obtain die briquetting, wherein copper powder content accounts for the 45-55% of composite powder gross mass, iron content accounts for the 25-35% of composite powder gross mass, graphite powder content accounts for the 10-15% of composite powder gross mass, and ceramic powder content accounts for the 1-5% of composite powder gross mass; Organic binder bond is spread at the joint face edge of die briquetting;
Step 2, blasting treatment is carried out to steel backing; Carry out copper facing to the steel backing after process, thickness of coating is at 0.05-0.75 millimeter;
Step 3, to copper plated steel back paving spill containing copper, iron and other low-melting-point metal powder, formed intermediate layer, thickness is in 1-1.5 millimeter scope;
Step 4, the die briquetting scribbling bonding agent and the steel backing that scribbles intermediate layer to be stacked, in clock hood type furnace, sinter 1-2 hour at 2-6MPa pressure, 850-950 DEG C temperature, realize copper based powder metallurgy friction material and be connected with the high strength of steel backing.
2. the copper-base powder metallurgy composite according to claim and the method for attachment of steel, is characterized in that: described copper-base powder metallurgy composite and the method for attachment of steel, is characterized in that: described copper-plated thickness is 0.05-0.75 millimeter.
3. the method for attachment of copper-base powder metallurgy composite according to claim 1 and steel, is characterized in that: described intermediate layer powder comprises other low-melting-point metal powder of copper powder, 25%-35% iron powder and 10%-20% that mass fraction is 45%-65%.
4. the method for attachment of copper-base powder metallurgy composite according to claim 1 and steel, is characterized in that: the joint face edge of described die briquetting spreads the epoxy resin acetone soln that organic adhesive is concentration 30%.
5. the method for attachment of copper-base powder metallurgy composite according to claim 1 and steel, is characterized in that: other described low-melting-point metal powder are the metal powder of fusing point lower than copper fusing point.
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Cited By (7)
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| CN104841941A (en) * | 2015-04-21 | 2015-08-19 | 龙工（上海）精工液压有限公司 | Valve plate with high friction-reducing performance and good anti-seizure performance and manufacturing process of valve plate |
| CN105618766A (en) * | 2016-01-27 | 2016-06-01 | 北京瑞斯福高新科技股份有限公司 | Powder metallurgy brake lining friction block for high-speed train and preparation method thereof |
| CN105772707A (en) * | 2016-04-27 | 2016-07-20 | 西安航空制动科技有限公司 | Bonding method of powder metallurgy iron-based friction material layer and steel backing and bonding material |
| CN106166610A (en) * | 2016-06-27 | 2016-11-30 | 杭州桑拉科技有限公司 | A kind of high ferro braking metal+ceramic base brake lining friction resistance material and preparation method thereof |
| CN109261956A (en) * | 2018-11-07 | 2019-01-25 | 山东金麒麟股份有限公司 | Adhesives, adhering method and bonding purposes and the friction block containing the adhesives |
| CN109854650A (en) * | 2019-03-27 | 2019-06-07 | 山东百德瑞轨道交通科技有限公司 | A kind of bullet train brake lining friction element and preparation method thereof |
| CN110541902A (en) * | 2019-09-06 | 2019-12-06 | 北京浦然轨道交通科技有限公司 | Copper-iron-based powder metallurgy brake pad friction block and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841941A (en) * | 2015-04-21 | 2015-08-19 | 龙工（上海）精工液压有限公司 | Valve plate with high friction-reducing performance and good anti-seizure performance and manufacturing process of valve plate |
| CN105618766A (en) * | 2016-01-27 | 2016-06-01 | 北京瑞斯福高新科技股份有限公司 | Powder metallurgy brake lining friction block for high-speed train and preparation method thereof |
| CN105772707A (en) * | 2016-04-27 | 2016-07-20 | 西安航空制动科技有限公司 | Bonding method of powder metallurgy iron-based friction material layer and steel backing and bonding material |
| CN106166610A (en) * | 2016-06-27 | 2016-11-30 | 杭州桑拉科技有限公司 | A kind of high ferro braking metal+ceramic base brake lining friction resistance material and preparation method thereof |
| CN109261956A (en) * | 2018-11-07 | 2019-01-25 | 山东金麒麟股份有限公司 | Adhesives, adhering method and bonding purposes and the friction block containing the adhesives |
| CN109854650A (en) * | 2019-03-27 | 2019-06-07 | 山东百德瑞轨道交通科技有限公司 | A kind of bullet train brake lining friction element and preparation method thereof |
| CN110541902A (en) * | 2019-09-06 | 2019-12-06 | 北京浦然轨道交通科技有限公司 | Copper-iron-based powder metallurgy brake pad friction block and preparation method thereof |
| CN110541902B (en) * | 2019-09-06 | 2021-07-30 | 北京浦然轨道交通科技股份有限公司 | Copper-iron-based powder metallurgy brake pad friction block and preparation method thereof |
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