CN102935511B - Method for improving copper-lead alloy metallographic structure sintered by copper-lead alloy powder - Google Patents
Method for improving copper-lead alloy metallographic structure sintered by copper-lead alloy powder Download PDFInfo
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- CN102935511B CN102935511B CN201110233518.6A CN201110233518A CN102935511B CN 102935511 B CN102935511 B CN 102935511B CN 201110233518 A CN201110233518 A CN 201110233518A CN 102935511 B CN102935511 B CN 102935511B
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Abstract
The invention discloses a copper-lead alloy powder. The copper-lead alloy powder is composed of compositions of, by weight, 0-0.2% of powders with particle sizes between -100 meshes and +150 meshes, 15-18% of powders with particle sizes between -150 meshes and +250 meshes, 32-35% of powders with particle sizes between -250 meshes and +325 meshes, 20-24% of powders with particle sizes between -325 meshes and +400meshes and 22.8-33% of powders with particle sizes of -400meshes. The invention further discloses a method for improving a copper-lead alloy metallographic structure sintered by the copper-lead alloy powder. According to the method, metallographical grades of alloy structures of powder sintered copper-lead alloy sliding bearing materials, particularly the metallographical grades of the alloy structures sintered on the surface of a low-carbon quality carbon steel material by the copper-lead alloy powder, so that the gap of production of copper-lead alloy bimetallic bearing materials with high comprehensive mechanical performances is filled.
Description
Technical field
The present invention is specifically related to a kind ofly improve the method for the powder sintered Pot metal metallographic structure of Pot metal and a kind of Pot metal powder.
Background technology
Along with the progress of auto technology, to automobile bearing material particularly to the copper/copper alloy bearing material used for engine that is high-power, top load, have higher requirement, such as, there is high strength, high-power and requirement that is superpower engine can be met, also require that bearing material works under adapting to different environment and operating mode, there is the ability of stress corrosion resistant and chemical attack.Up to the present, the bearing material that high-power engine generally uses is Allen's metal alloy bearing material, and this kind of bearing material contains the lead of 5%-40%.Because lead is not dissolved in copper admittedly, also not with copper generation alloying, only independently exist mutually as anti-attrition, destroy the continuity of copper alloy matrix, the uniformity that lead element distributes in Pot metal determines the mechanical load-bearing capability of copper alloy.Therefore having high-grade Pot metal metallographic structure is the principal element improving copper alloy mechanical load-bearing capability, and high-grade Pot metal has lower coefficient of friction, can reduce and friction occlusion occur and the accident that causes.
Summary of the invention
Technical problem to be solved by this invention is the defect that the copper-lead bearing strength of materials is not high, mechanical load-bearing capability is poor used to overcome engine that is high-power in prior art, top load, a kind of a kind of and provide Pot metal powder, and method improving the powder sintered Pot metal metallographic structure of Pot metal.Method of the present invention can improve the metallographic grade of the alloy structure of powder sintered Pot metal material for sliding bearing, particularly improve the metallographic grade that copper closes the powder sintered alloy structure at low-carbon (LC) Fine Steel Casting iron material surface, fill up the blank that high comprehensive mechanical performance Pot metal bimetal bearing material is produced.
Therefore, the present invention relates to a kind of Pot metal powder, wherein, the granularmetric composition of described Pot metal powder is :-100 order ~+150 object content of powder are 0 ~ 0.2%;-150 order ~+250 object content of powder are 15 ~ 18%;-250 order ~+325 object content of powder are 32 ~ 35%;-325 order ~+400 object content of powder are 20 ~ 24%;-400 object content of powder are 22.8 ~ 33%, and above percentage is all weight percentage.
Wherein, described Pot metal powder obtains by the customary preparation methods of this type of powder of this area, and the present invention is particularly preferably obtained by water atomization or aerosolization method of granulating.Wherein, the step that described water atomization or aerosolization method of granulating adopt and condition, all can be step conventional in this area water atomization or aerosolization method of granulating and condition.Described Pot metal powder is preferably spherical or ellipsoid shape.
In the present invention, the chemical composition of described Pot metal powder and corresponding content all can be composition conventional in the Pot metal powder of this area and content.Pot metal powder of the present invention particularly preferably following chemical composition and content: plumbous 20 ~ 26%, tin 1 ~ 2%, zinc 0 ~ 1%, copper 70.5 ~ 79%, other impurity content summation is no more than 0.5%, and above each percentage is all weight percentage.
The invention further relates to a kind of method improving the powder sintered Pot metal metallographic structure of Pot metal, it comprises the following step:
(1) with power spreading device, on pretreated carbon steel material, above-mentioned Pot metal powder is paved with equably;
(2) under restitutive protection's atmosphere, sinter in sintering furnace, sintering temperature 760 ~ 870 DEG C, sintering time 10 ~ 80 minutes;
(3) blooming and levelling: the material after first sintering is carried out cold rolling on cold-rolling mill, is rolling to the thickness preset by technological requirement design;
(4) under restitutive protection's atmosphere, again sinter in sintering furnace, sintering temperature is 850 ~ 960 DEG C, and the time is 15 ~ 80 minutes;
(5) finish rolling and levelling: the material after again sintering carries out finish rolling again on cold-rolling mill, is rolling to the thickness preset by technological requirement design.
In step (1), described power spreading device can be automatic power spreading machine.Described carbon steel material is preferably low-carbon (LC) Fine Steel Casting iron steel plate, and the carbon content of described low-carbon (LC) Fine Steel Casting iron is preferably less than or equal to 0.25%.
In step (2) or step (4); described restitutive protection's atmosphere is preferably the gaseous mixture protective atmosphere of hydrogen, decomposed ammonia or hydrogen and nitrogen; in the gaseous mixture protective atmosphere of described hydrogen and nitrogen, the mixed volume ratio of hydrogen and nitrogen is preferably hydrogen: nitrogen is 5% ~ 95%: 95% ~ 5%.
In step (2) or (4), described sintering furnace is preferably net belt type continuous fritting furnace or Automatic continuous sintering furnace.
In step (3) or (5), preferably rolling accuracy is controlled at ± 0.01mm.
Without prejudice to the field on the basis of common sense, above-mentioned each optimum condition, can be combined, obtain the preferred embodiments of the invention.
The present invention is raw materials used all commercially.
Positive progressive effect of the present invention is:
The method of the Pot metal metallographic structure that raising Pot metal of the present invention is powder sintered, the metallographic grade of the alloy structure of powder sintered Pot metal material for sliding bearing can be improved, intensity and the hardness of Pot metal material for sliding bearing can be improved, there is lower coefficient of friction, generation abrasion occlusion can be reduced and cause the accident.Compared with traditional lead bronze bearing material, the Pot metal-steel composite bimetallic bearing material adopting the inventive method to manufacture, has higher intensity, better lubricity and the wearability under harsh load bearing situations.
Detailed description of the invention
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.The experimental technique of unreceipted actual conditions in the following example, conventionally and condition, or selects according to catalogue.
Embodiment 1
1. target production material specification is: gross thickness 2.5 × alloy width 120mm, and alloy thickness is the Pot metal-steel composite bimetallic bearing material sheet material of 0.5mm.
2. steel plate prepares: the Fine Steel Casting iron steel plate selecting the SPCC trade mark, the steel plate shearing opened greatly is become 2.5 × 126 × 625mm of design, carries out degreasing and rust removal, change and be rolled to 2.0 ± 0.01 × 126 × 780mm, and smooth, flatness≤0.5mm.
3. alloy powder prepares, and adopts hydraulic atomized method to produce Pot metal powder, and by weight percentage, lead 23%, tin 1.5%, zinc 0.4%, other impurity content summation is no more than 0.5% to the chemical composition of powder.Surplus is copper
4. alloy powder prepares, and adopt hydraulic atomized method to produce Pot metal powder, the particle diameter of described Pot metal powder meets :-100 order ~+150 order content are 0.2%;-150 order ~+250 order content are 18%;-250 order ~+325 order content are 35%;-325 order ~+400 order content are 24%.-400 order content are 22.8%.
5. by design finished product be the alloy layer thickness of 0.5mm; paving powder thickness is 0.85mm; alloy powder is layered on uniformly on the good steel plate of pretreatment; and sinter in the crawler type sintering furnace being connected with decomposed ammonia restitutive protection atmosphere, first sintering (just burning) temperature is 850 DEG C.Sintering time is 20 minutes, makes between alloy powder, has certain bond strength between alloy powder and steel plate.
6. blooming and levelling, carries out the material after just burning cold rolling, is rolling to the thickness of 2.60mm on cold-rolling mill, and precision controlling is at ± 0.01mm.The object of breaking down puies forward heavy alloyed density.
7. resintering.The material good by breaking down, again sinter at the temperature of 880 DEG C (resintering), sintering time is 20 minutes, makes between alloy, and the bond strength between alloy and steel plate improves further.
8. finish rolling and smoothing.Material after resintering, is rolled (finish rolling), and after rolling, thickness is 2.50 ± 0.01mm, its objective is and puies forward heavy alloyed density further, and the thickness of required copper-lead-bronze alloy-steel bonded dual metal.
9. finished product metallographic testing result meets the standard 1 grade that national GB/T281-1999 specifies metallographic.
Embodiment 2
Target production material specification is: gross thickness 3.5 × alloy width 100mm, and alloy thickness is 0.80mm, Pot metal-steel composite bimetallic bearing material sheet material.
Select the Fine Steel Casting iron structural steel and iron of the St37-2G trade mark, steel plate shearing is become the billot of width 106mm and length 600mm, carry out surface degreasing, rust cleaning, change the thickness rolling 2.70mm, and smooth.Alloy powder prepares, and adopt the method for high pressure gas atomization to produce Pot metal powder, the particle diameter of Pot metal powder meets :-100 order ~+150 order content are 0.0%;-150 order ~+250 order content are 17.4%;-250 order ~+325 order content are 33.5%;-325 order ~+400 order content are 23.2%.-400 order content are 25.9%; The chemical composition of powder by weight percentage; plumbous 24%; tin 1.1%; zinc 0.8%; other impurity content summation is no more than 0.5%, and surplus is that the alloy powder of copper is layered on processed good steel plate uniformly, and is placed on to be connected with in restitutive protection's atmosphere sintering furnace and sinters; remaining production technology is with embodiment 1, and finished product metallographic testing result meets the standard 1 grade that national GB/T281-1999 specifies metallographic.
Embodiment 3
Target production material specification is: gross thickness 5.0 × alloy width 140mm, and alloy thickness is 1.5mm, copper-lead-steel composite bimetallic bearing material sheet material.
Select the Fine Steel Casting iron structural steel and iron of the SS400 trade mark, steel plate shearing is become the billot of width 146mm and length 650mm, carry out surface degreasing, rust cleaning, change and be rolled to 3.50mm thickness, and smooth.Alloy powder prepares, and adopt the method for high pressure gas atomization to produce Pot metal powder, the particle diameter of Pot metal powder meets :-100 order ~+150 order content are 0.1%;-150 order ~+250 order content are 17.8%;-250 order ~+325 order content are 33.1%;-325 order ~+400 order content are 23.5%.-400 order content are 25.5%; The chemical composition of powder by weight percentage; plumbous 23.5%; tin 1.5%; zinc 0.2%; other impurity content summation is no more than 0.5%, and surplus is that the alloy powder of copper is layered on processed good steel plate uniformly, and is placed on to be connected with in restitutive protection's atmosphere sintering furnace and sinters; remaining production technology is with embodiment 1, and finished product metallographic testing result meets the standard 1 grade that national GB/T281-1999 specifies metallographic.
Claims (10)
1. a Pot metal powder, is characterized in that: the granularmetric composition of described Pot metal powder is :-100 order ~+150 object content of powder are 0 ~ 0.2%;-150 order ~+250 object content of powder are 15 ~ 18%;-250 order ~+325 object content of powder are 32 ~ 35%;-325 order ~+400 object content of powder are 20 ~ 24%;-400 object content of powder are 22.8 ~ 33%, and above percentage is all weight percentage.
2. Pot metal powder as claimed in claim 1, is characterized in that: described Pot metal powder is obtained by water atomization or aerosolization method of granulating.
3. Pot metal powder as claimed in claim 1 or 2, is characterized in that: described Pot metal powder is spherical or ellipsoid shape.
4. Pot metal powder as claimed in claim 1 or 2, it is characterized in that: in described Pot metal powder, lead is 20 ~ 26%, tin is 1 ~ 2%, and zinc is 0 ~ 1%, and copper is 70.5 ~ 79%, other impurity content summation is no more than 0.5%, and above each percentage is all weight percentage.
5. improve a method for the powder sintered Pot metal metallographic structure of Pot metal, it is characterized in that comprising the following step:
(1) with power spreading device, on pretreated carbon steel material, the Pot metal powder as described in any one of Claims 1 to 4 is paved with equably;
(2) under restitutive protection's atmosphere, sinter in sintering furnace, sintering temperature 760 ~ 870 DEG C, sintering time 10 ~ 80 minutes;
(3) blooming and levelling: the material after first sintering is carried out cold rolling on cold-rolling mill, is rolling to the thickness preset by technological requirement design;
(4) under restitutive protection's atmosphere, again sinter in sintering furnace, sintering temperature is 850 ~ 960 DEG C, and the time is 15 ~ 80 minutes;
(5) finish rolling and levelling: the material after again sintering carries out finish rolling again on cold-rolling mill, is rolling to the thickness preset by technological requirement design.
6. method as claimed in claim 5, is characterized in that: described carbon steel material is low-carbon (LC) Fine Steel Casting iron steel plate.
7. method as claimed in claim 6, is characterized in that: the carbon content of described low-carbon (LC) Fine Steel Casting iron is less than or equal to 0.25%.
8. method as claimed in claim 5; it is characterized in that: in step (2) or step (4); described restitutive protection's atmosphere is the gaseous mixture protective atmosphere of hydrogen, decomposed ammonia or hydrogen and nitrogen; in the gaseous mixture protective atmosphere of described hydrogen and nitrogen, the mixed proportion of hydrogen and nitrogen is hydrogen: nitrogen is 5% ~ 95%: 95% ~ 5%.
9. method as claimed in claim 5, is characterized in that: in step (2) or (4), described sintering furnace is net belt type continuous fritting furnace or Automatic continuous sintering furnace.
10. method as claimed in claim 5, is characterized in that: in step (3) or (5), is controlled by rolling accuracy at ± 0.01mm.
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| CN104148634B (en) * | 2014-08-20 | 2016-10-19 | 韩建 | A kind of self-lubricating bearing sheet material sintering method and for the method put grillage |
| CN104209525A (en) * | 2014-08-20 | 2014-12-17 | 安徽汉升新金属技术有限公司 | Production technology for copper and lead composite material |
| CN104148633B (en) * | 2014-08-20 | 2016-10-26 | 韩建 | A kind of sliding bearing sheet material sintering method and the support for the method |
| CN104148635B (en) * | 2014-08-20 | 2016-11-16 | 韩建 | The device sintered for sliding bearing sheet material and the method utilizing this device to sinter |
| CN105478518A (en) * | 2014-09-15 | 2016-04-13 | 怀宁汉升车辆部件有限公司 | Production technology of steel-copper bimetal composite material for bearing manufacture |
| CN109244686B (en) * | 2018-07-26 | 2021-06-18 | 合德华厦安防科技有限公司 | Core rod for grounding system and preparation method thereof |
| CN112626369A (en) * | 2019-09-24 | 2021-04-09 | 种向东 | Copper alloy powder and water atomization preparation method |
| CN112264616A (en) * | 2020-10-27 | 2021-01-26 | 武汉科技大学 | Preparation method of CuSnNiP-based copper alloy lubricating friction-resistant material by liquid-phase sintering method |
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| KR20120032463A (en) * | 2009-04-02 | 2012-04-05 | 오르멧 서키츠 인코퍼레이티드 | Conductive compositions containing blended alloy fillers |
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