CN101088671B - Brass coated composite iron powder and its production process - Google Patents
Brass coated composite iron powder and its production process Download PDFInfo
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- CN101088671B CN101088671B CN2007100924423A CN200710092442A CN101088671B CN 101088671 B CN101088671 B CN 101088671B CN 2007100924423 A CN2007100924423 A CN 2007100924423A CN 200710092442 A CN200710092442 A CN 200710092442A CN 101088671 B CN101088671 B CN 101088671B
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Abstract
The brass clad iron composite powder is formed through forming cladding brass layer on Cu clad Fe composite powder, and contains Cu 5-40 wt%, Zn 0.05-40 wt% and Fe for the rest. The brass clad iron composite powder is produced through mixing Cu clad Fe composite powder and Cu-Zn alloy powder or Zn powder, reducing adhesion or reducing diffusion in a reducing furnace at temperature of 450-800 deg.c for over 30 min to form cladding Cu-Zn alloy layer on Cu clad Fe composite powder, crushing, sieving, mixing and other steps. The present invention has the advantages of low cost, simple technological process, no environmental pollution, high antioxidant performance, etc.
Description
(1), technical field
The present invention relates to a kind of metal dust and manufacture method thereof, particularly a kind of composite metal powder and manufacture method thereof.
(2), background technology
At present, what be used for that the metal dust of aspects such as oiliness bearing, diamond segment, friction material mainly adopts is copper powder, brass powder or iron powder, two kinds or the mixed metal powder that all mixes in also useful first three powder, these metal dusts exist following deficiency:
1, copper powder, iron powder are the elemental metals powder, and be in use, as easy as rolling off a log oxidized.
2, the mixed metal powder apparent density that is made of copper powder, zinc powder, brass powder and iron powder is different, is prone to segregation during mixing, and the result of segregation will have a strong impact on the quality of product.
3, the cost of raw material of copper powder, brass powder is very high, and its price is general per ton about 7.5 ten thousand yuans.
Since above-mentioned, cause the product price of producing with these metal dusts very high, and also very easy oxidized, the product quality after the oxidation is very poor, and is fragile, and service life is short.
In order to address the above problem, relevant technologies personnel have developed copper-coated iron composite powder, this composite powder has the low advantage of cost, but exist powder self antioxygenic property poor, though the technical staff has carried out anti-oxidation processing to it, but in the process of producing product, its antioxygenic property is destroyed again, makes product still oxidized easily with this powder.
Therefore, produce a kind of with low cost, good metal dust of self antioxygenic property and have vast market prospect.Copper alloy has the good advantage of self antioxygenic property, relevant technologies personnel attempt directly to be coated on the surface of ferrous powder granules with copper alloy, as: the patent of invention that a kind of name is called " composite metal powder for powder metallurgy " is disclosed in CN1180904C, it is to form the copper of 5 weight %-75 weight % or the composite metal powder for powder metallurgy of copper alloy clad on iron powder, the calcium content that is contained in the iron powder as raw meal≤0.06 weight % wherein, the calcium content in this composite metal powder≤0.02 weight %.This patent disclosure one Albatra metal-iron clad composite powder, in fact because iron and copper or copper alloy do not dissolve each other each other, can not spread each other between iron and copper or the copper alloy, therefore, with the mode of physics, it is impracticable at all directly copper alloy directly being coated on the ferrous powder granules.
(3), summary of the invention
First purpose of the present invention just provides a kind of brass-clad iron composite powder, and it is not only with low cost, and has very strong self antioxygenic property, belongs to non-harmful product.
Second purpose of the present invention just provides a kind of manufacture method of brass-clad iron composite powder of production above-mentioned purpose, and this method production technology is simple, production cost is low, and the waste discharge of nonpollution environment belongs to non-harmful production method.
First purpose of the present invention is to realize by such technical scheme, it is the composite metal powder that forms the ormolu clad on copper-coated iron composite powder, wherein, copper accounts for the 5%-40% of described composite metal powder gross weight, zinc accounts for the 0.05%-20% of described composite metal powder gross weight, and surplus is an iron.
Brass is exactly ormolu.Brass-clad iron composite powder of the present invention is to be that core, intermediate layer are that copper, skin are the composite metal powder of the three-decker of ormolu with iron.According to existing technology, it is impracticable directly ormolu being coated on the ferrous powder granules, its reason is: copper, zinc, ormolu are all and immiscible between the iron, copper, zinc, ormolu both be difficult to stick on the ferrous powder granules with physics mode, also be difficult to and iron powder between diffusion each other, form iron-copper, iron-zinc alloy or iron ormolu.Allow iron powder be coated on technical barrier in the ormolu in order to solve, can only on the iron powder surface, coat one deck copper film with chemical mode, form copper-coated iron composite powder, the production method of copper-coated iron composite powder belongs to existing mature technology, because copper and zinc, dissolve each other each other between the ormolu, therefore, just can adopt physics mode that cu-zn alloy powder is adhered on the copper-coated iron composite powder surface, also zinc can be spread in the copper film of copper-coated iron composite powder from outside to inside, make the outer ormolu that forms of copper film, internal layer remains the copper layer, thereby obtains brass-clad iron composite powder.
Because ormolu self has stronger antioxygenic property, therefore, resulting brass-clad iron composite powder does not need to carry out anti-oxidant treatment again, just has good antioxygenic property, and with the product that it is produced, antioxygenic property also is significantly improved.Compare with brass powder,, not only can keep the physical property of brass powder, also have the good performance of intensity of iron, and significantly reduced manufacturing cost owing to be primary raw material with iron mainly in the brass-clad iron composite powder.
Second purpose of the present invention is to realize by following step:
(1), in copper-coated iron composite powder, adds cu-zn alloy powder, abundant mixing, send into then and reduce adhesion in the reduction furnace of band reduction, protective atmosphere, temperature is controlled in 450 ℃ of-800 ℃ of scopes in the stove of reduction furnace, the time that reduction adheres to is no less than 30 minutes, cu-zn alloy powder is adhered on the surface of copper-coated iron composite powder, form the ormolu clad, that is: brass-clad iron composite powder; Contain zinc and be lower than the fusing point of 20% ormolu in 900 ℃ of-1083 ℃ of scopes, therefore, in 450 ℃ of-800 ℃ of scopes, ormolu in the reduction furnace still is in solid-state, the contact-making surface of the copper on ormolu and copper-coated iron composite powder surface spreads each other, and ormolu is sticked on the surface of copper-coated iron composite powder.Because metal dust is in production or transportation, all can there be oxidation in various degree on the surface, generates oxide, and the metal that has oxide is difficult to adhere to each other each other, has only pure metal surface could adhere to each other well under high temperature action.Therefore, the purpose that copper-coated iron composite powder, cu-zn alloy powder are sent in the reduction furnace after mixing together is exactly the oxide generation chemical reaction that makes the metal surface, seize the oxygen in the oxide, the surface that makes metal dust is pure, under corresponding high temperature action, cu-zn alloy powder is sticked on the surface of copper-coated iron composite powder securely.
(2), the brass-clad iron composite powder that reduction adhesion back is generated carries out fragmentation, screening;
(3), the brass-clad iron composite powder after the screening is mixed powder, check, metering, packing warehouse-in.
Since adopted technique scheme, brass-clad iron composite powder of the present invention to have with low cost and very strong self antioxygenic property, the genus non-harmful product, production cost per ton is at 2.2 ten thousand yuans, and cost of material is 1/3rd of a brass powder.The method that the present invention produces brass-clad iron composite powder has that technology is simple, production cost is low, and the waste discharge of nonpollution environment belongs to non-harmful production method.
(4), the specific embodiment
The invention will be further described below in conjunction with embodiment:
The present invention is the composite metal powder that forms the ormolu clad on copper-coated iron composite powder, and wherein, copper accounts for the 5%-40% of described composite metal powder gross weight, and zinc accounts for the 0.05%-20% of described composite metal powder gross weight, and surplus is an iron.
Brass is exactly ormolu.Brass-clad iron composite powder of the present invention is to be that core, intermediate layer are that copper, skin are the composite metal powder of the three-decker of ormolu with iron.According to existing technology, it is impracticable directly ormolu being coated on the ferrous powder granules, its reason is: copper, zinc, ormolu are all and immiscible between the iron, copper, zinc, ormolu both be difficult to stick on the ferrous powder granules with physics mode, also be difficult to and iron powder between diffusion each other, form iron-copper, iron-zinc alloy or iron ormolu.Allow iron powder be coated on technical barrier in the ormolu in order to solve, can only on the iron powder surface, coat one deck copper film with chemical mode, form copper-coated iron composite powder, the production method of copper-coated iron composite powder belongs to existing mature technology, because copper and zinc, dissolve each other each other between the ormolu, therefore, just can adopt physics mode that cu-zn alloy powder is adhered on the copper-coated iron composite powder surface, also zinc can be spread in the copper film of copper-coated iron composite powder from outside to inside, make the outer ormolu that forms of copper film, internal layer remains the copper layer, thereby obtains brass-clad iron composite powder.
Because ormolu self has stronger antioxygenic property, therefore, resulting brass-clad iron composite powder does not need to carry out anti-oxidant treatment again, just has good antioxygenic property, and with the product that it is produced, antioxygenic property also is significantly improved.Compare with brass powder,, not only can keep the physical property of brass powder, also have the good performance of intensity of iron, and significantly reduced manufacturing cost owing to be primary raw material with iron mainly in the brass-clad iron composite powder.
Brass-clad iron composite powder of the present invention is to be that core, intermediate layer are that copper, skin are the composite metal powder of the three-decker of ormolu with iron.The ratio of copper and zinc can be allocated according to the needs in market:
In the described composite metal powder, copper accounts for 5% of gross weight, and zinc accounts for the 0.05%-2.5% of gross weight, and wherein, zinc can account for 0.05% of composite metal powder gross weight, also can account for 2.5% of composite metal powder gross weight.
In the described composite metal powder, copper accounts for 20% of gross weight, and zinc accounts for the 0.2%-10% of gross weight, and wherein, zinc can account for 0.2% of composite metal powder gross weight, also can account for 10% of composite metal powder gross weight.Copper accounts for the 18%-22% of gross weight, the 8%-10% that zinc accounts for gross weight, the combination that surplus is iron is a preferred version, and preferred plan is: copper account for gross weight 21%, zinc account for gross weight 9%, surplus is iron, promptly is 30 brass-clad iron composite powders.
In the described composite metal powder, copper accounts for 40% of gross weight, and zinc accounts for the 0.4%-20% of gross weight, and wherein, zinc can account for 0.4% of composite metal powder gross weight, also can account for 20% of composite metal powder gross weight.
First kind of manufacture method of brass-clad iron composite powder of the present invention carried out as follows:
(1), in copper-coated iron composite powder, adds cu-zn alloy powder, abundant mixing, send into then and reduce adhesion in the reduction furnace of band reduction, protective atmosphere, temperature is controlled in 450 ℃ of-800 ℃ of scopes in the stove of reduction furnace, the time that reduction adheres to is no less than 30 minutes, cu-zn alloy powder is adhered on the surface of copper-coated iron composite powder, form the ormolu clad, that is: brass-clad iron composite powder; Contain zinc and be lower than the fusing point of 20% ormolu in 900 ℃ of-1083 ℃ of scopes, therefore, in 450 ℃ of-800 ℃ of scopes, ormolu in the reduction furnace still is in solid-state, the contact-making surface of the copper on ormolu and copper-coated iron composite powder surface spreads each other, and ormolu is sticked on the surface of copper-coated iron composite powder.Because metal dust is in production or transportation, all can there be oxidation in various degree on the surface, generates oxide, and the metal that has oxide is difficult to adhere to each other each other, has only pure metal surface could adhere to each other well under high temperature action.Therefore, the purpose that copper-coated iron composite powder, cu-zn alloy powder are sent in the reduction furnace after mixing together is exactly the oxide generation chemical reaction that makes the metal surface, seize the oxygen in the oxide, the surface that makes metal dust is pure, under corresponding high temperature action, cu-zn alloy powder is sticked on the surface of copper-coated iron composite powder securely.
(2), the brass-clad iron composite powder that reduction adhesion back is generated carries out fragmentation, screening;
(3), the brass-clad iron composite powder after the screening is mixed powder, check, metering, packing warehouse-in.
In the said method, in order to improve the effect of producing product, cu-zn alloy powder is coated on the copper-coated iron composite powder better, and the granularity of cu-zn alloy powder is laminated with the granularity of powder less than copper-clad iron, and cu-zn alloy powder can be coated on the surface of copper-coated iron composite powder.The granularity of copper-coated iron composite powder can be below 80 orders, little 100 orders of the granularity of the fineness ratio copper-coated iron composite powder of cu-zn alloy powder.The granularity of copper-coated iron composite powder is preferably less than 100 orders, and the granularity of cu-zn alloy powder is preferably less than 300 orders.
In order to prolong the storage period of brass-clad iron composite powder, further strengthen its antioxygenic property, can carry out anti-oxidation processing to the brass-clad iron composite powder of producing.The method of anti-oxidation processing is: add a spot of corrosion inhibiter in brass-clad iron composite powder.Corrosion inhibiter can be a benzotriazole, also can zinc stearate, and can also be other any corrosion inhibiter that plays same function.
Claims (14)
1. brass-clad iron composite powder, it is characterized in that: it is the composite metal powder that forms the ormolu clad on copper-coated iron composite powder, and wherein, copper accounts for the 5%-40% of described composite metal powder gross weight, zinc accounts for the 0.05%-20% of described composite metal powder gross weight, and surplus is an iron.
2. brass-clad iron composite powder as claimed in claim 1 is characterized in that: in the described composite metal powder, copper accounts for 5% of gross weight, and zinc accounts for the 0.05%-2.5% of gross weight.
3. brass-clad iron composite powder as claimed in claim 2 is characterized in that: in the described composite metal powder, zinc accounts for 0.05% of composite metal powder gross weight.
4. brass-clad iron composite powder as claimed in claim 2 is characterized in that: in the described composite metal powder, zinc accounts for 2.5% of composite metal powder gross weight.
5. brass-clad iron composite powder as claimed in claim 1 is characterized in that: in the described composite metal powder, copper accounts for 20% of gross weight, and zinc accounts for the 0.2%-10% of gross weight.
6. brass-clad iron composite powder as claimed in claim 5 is characterized in that: in the described composite metal powder, zinc accounts for 0.2% of composite metal powder gross weight.
7. brass-clad iron composite powder as claimed in claim 5 is characterized in that: in the described composite metal powder, zinc accounts for 10% of composite metal powder gross weight.
8. brass-clad iron composite powder as claimed in claim 1 is characterized in that: in the described composite metal powder, copper accounts for 40% of gross weight, and zinc accounts for the 0.4%-20% of gross weight.
9. brass-clad iron composite powder as claimed in claim 8 is characterized in that: in the described composite metal powder, zinc accounts for 0.4% of composite metal powder gross weight.
10. brass-clad iron composite powder as claimed in claim 8 is characterized in that: in the described composite metal powder, zinc accounts for 20% of composite metal powder gross weight.
11. the manufacture method as claim 1,2,3,4,5,6,7,8,9 or 10 described brass-clad iron composite powders, its step is as follows:
(1), in copper-coated iron composite powder, adds cu-zn alloy powder, abundant mixing, send into then and reduce adhesion in the reduction furnace of band reduction, protective atmosphere, temperature is controlled in 450 ℃ of-800 ℃ of scopes in the stove of reduction furnace, the time that reduction adheres to is no less than 30 minutes, cu-zn alloy powder is adhered on the surface of copper-coated iron composite powder, form the ormolu clad, that is: brass-clad iron composite powder;
(2), the brass-clad iron composite powder that reduction adhesion back is generated carries out fragmentation, screening;
(3), the brass-clad iron composite powder after the screening is mixed powder, check, metering, packing warehouse-in.
12. the manufacture method of brass-clad iron composite powder as claimed in claim 11 is characterized in that: the granularity of cu-zn alloy powder makes cu-zn alloy powder can be coated on the surface of copper-coated iron composite powder less than the granularity of copper-coated iron composite powder at least.
13. the manufacture method of brass-clad iron composite powder as claimed in claim 12 is characterized in that: the granularity of copper-coated iron composite powder below 80 orders, little 100 orders of the granularity of the fineness ratio copper-coated iron composite powder of cu-zn alloy powder.
14. the manufacture method of brass-clad iron composite powder as claimed in claim 13 is characterized in that: the granularity of copper-coated iron composite powder is less than 100 orders, and the granularity of cu-zn alloy powder is less than 300 orders.
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| CN2007100924423A CN101088671B (en) | 2007-07-18 | 2007-07-18 | Brass coated composite iron powder and its production process |
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| CN2007100924423A CN101088671B (en) | 2007-07-18 | 2007-07-18 | Brass coated composite iron powder and its production process |
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| CN101088671B true CN101088671B (en) | 2010-10-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101638735B (en) * | 2008-08-01 | 2011-08-31 | 重庆华浩冶炼有限公司 | Brass composite powder and preparation method thereof |
| CN102554220A (en) * | 2012-02-29 | 2012-07-11 | 重庆大学 | Preparation method of copper-cladded iron composite powder |
| CN102794449A (en) * | 2012-03-21 | 2012-11-28 | 朱湖泽 | Method for producing copper coated iron powder |
| CN104294137A (en) * | 2014-09-25 | 2015-01-21 | 昆山伯建精密模具有限公司 | Copper-zinc alloy mold |
| CN111451519B (en) * | 2020-04-03 | 2022-10-14 | 龙门金南磁性材料有限公司 | Preparation method of brass-coated iron powder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB386499A (en) * | 1932-03-10 | 1933-01-19 | Harshaw Chem Corp | An improved manufacture of metallic compositions |
| CN1388768A (en) * | 2000-09-04 | 2003-01-01 | 株式会社日矿材料 | Composite metal powder for powder metallurgy |
| CN1730209A (en) * | 2005-08-18 | 2006-02-08 | 重庆扬子粉末冶金有限责任公司 | Manufacturing method of copper-coated iron composite powder |
| CN1868637A (en) * | 2005-05-25 | 2006-11-29 | 成都市同心元新材料有限公司 | Copper alloy coated composite powder and its preparation method |
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- 2007-07-18 CN CN2007100924423A patent/CN101088671B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB386499A (en) * | 1932-03-10 | 1933-01-19 | Harshaw Chem Corp | An improved manufacture of metallic compositions |
| CN1388768A (en) * | 2000-09-04 | 2003-01-01 | 株式会社日矿材料 | Composite metal powder for powder metallurgy |
| CN1868637A (en) * | 2005-05-25 | 2006-11-29 | 成都市同心元新材料有限公司 | Copper alloy coated composite powder and its preparation method |
| CN1730209A (en) * | 2005-08-18 | 2006-02-08 | 重庆扬子粉末冶金有限责任公司 | Manufacturing method of copper-coated iron composite powder |
Non-Patent Citations (1)
| Title |
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| CN 1388768 A,全文. |
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