CN100348351C - Manufacturing method of copper-coated iron composite powder - Google Patents
Manufacturing method of copper-coated iron composite powder Download PDFInfo
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- CN100348351C CN100348351C CNB2005100572317A CN200510057231A CN100348351C CN 100348351 C CN100348351 C CN 100348351C CN B2005100572317 A CNB2005100572317 A CN B2005100572317A CN 200510057231 A CN200510057231 A CN 200510057231A CN 100348351 C CN100348351 C CN 100348351C
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- copper
- composite powder
- coated iron
- iron composite
- powder
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Abstract
The present invention relates to a manufacturing method of iron-in-copper composite powder. Reducing iron powder is rapidly added to a copper sulfate solution mixed with stabilizing agents under the state of stir, wherein the pH value of the copper sulfate solution is from 0.1 to 6.5, mixtures continue to be stirred for 2 to 10 minutes, the surfaces of iron powder particles are completely coated by copper, and the iron-in-copper composite powder is formed; the iron-in-copper composite powder is settled for 1 to 20 minutes, supernate is removed, and the iron-in-copper composite powder is washed until the iron-in-copper composite powder has no acidity; the iron-in-copper composite powder is sieved after being dehydrated, dried and reduced; then, antioxidation treatment is carried out to the iron-in-copper composite powder, and powder mixture, test, packaging and warehousing are carried out. The copper can be uniformly, tightly, firmly and completely coated on the iron powder particles by the present invention, the iron-in-copper composite powder can not be oxidized in six mouths when being placed, and the antioxidation performance is increased.
Description
Technical field
The present invention relates to the manufacture method of a kind of manufacture method of metal dust, particularly a kind of composite metal powder.
Background technology
Oiliness bearing is compared with traditional ball bearing, has with low costly, does not have advantages such as cutting, pollution-free, easy production.Along with the progressively expansion of powder metallurgy range of application, to use also more and more widely as the metal dust of sintered metal product primary raw material, the total output of China's oiliness bearing in 1999 reaches 2,500,000,000 tons.Therefore, the required raw material of production oiliness bearing---metal dust also increases sharply, and the kind of metal dust develops into composite powder gradually from mixed powder, alloyed powder.The oiliness bearing of China's pulverulent product generally all adopts bronze powder and copper iron mixed powder to make at present, the copper based articles of bronze powder production causes product price higher owing to the prices of raw and semifnished materials are high on the one hand, on the other hand because bronze powder is leaded, according to present environmental requirement, pulverulent product is no leadwork as far as possible, therefore, the copper based articles made from bronze powder is subjected to more serious restriction.Copper-coated iron composite powder is the ideal material of the oiliness bearing of Development and Production in recent years, and it is based on iron powder, coats one deck copper film at its particle surface, forms a kind of appearance color copper iron-based composite powder the same with copper powder.Oiliness bearing with copper-coated iron composite powder production is compared with the oiliness bearing of making of bronze powder, and not only compliance with environmental protection requirements, and price is much lower, obtains users' extensive use and popularization.What the production method of existing copper iron mixed powder adopted is to mix diffusion method, it is that copper powder and reduced iron powder are mixed according to a certain percentage, be heated to certain temperature then, make the copper powder fusing and be coated on the ferrous powder granules surface, because this method is that a kind of mode with physics is the surface of copper clad at ferrous powder granules, therefore, it exists following deficiency:
1. because the bulk density between copper powder and iron powder is different, be prone to segregation during mixing, segregation just causes some places copper more, and some places copper is few, even does not have copper, the place that copper is many, and during the copper clad ferrous powder granules, copper film is blocked up; The place that copper is few during the copper clad ferrous powder granules, coats not exclusively, even does not coat fully.In a word, be that the copper clad iron powder is inhomogeneous.
2. owing to be that physical property contact between copper and the iron, easily gas is coated wherein, cause the contact tightness degree to reduce, cause the copper film bubbling and come off.
3. because the product appearance color that the segregation of copper is produced is inhomogeneous, easily oxidation, the oiliness bearing starting current of production is excessive, causes noise excessive.
The patent of invention that a kind of name is called " manufacture method of copper-coated iron composite powder " is disclosed in CN1209216C, the described method of this patent is under the state that stirs, reduced iron powder added rapidly to be mixed with stabilizing agent and pH value be in 0.5～4.8 the copper-bath, continue to stir 2～10 minutes, make copper be coated on the surface of ferrous powder granules fully, promptly form copper-coated iron composite powder; Allow copper-coated iron composite powder sedimentation 3-20 minute, remove supernatant, add the clear water washing, make it no acidic till; After dehydrating the reduction processing, sieve again; Carry out anti-oxidation processing then, mix powder, check, packing warehouse-in.This patent exists following deficiency:
1. protection domain is too narrow, can not reach the purpose of protection fully; Through facts have proved, do not add stabilizing agent----2-mercapto benzothiazole in the method for producing, also can produce copper-coated iron composite powder, and the span of the weight ratio equivalence of the pH value of copper-bath, copper sulphate and reduced iron powder is too single, also can produce the copper-coated iron composite powder of various copper contents under other many value condition in the same old way.
2. the value of zinc stearate, benzotriazole is respectively 5%, 5 ‰, because the price of zinc stearate is several ten thousand yuan one ton, the price of benzotriazole is a hundreds of thousands per ton yuan, and therefore, it exists the deficiency that consumption is excessive, cost is too high.
Summary of the invention
Purpose of the present invention just provides a kind of manufacture method of copper-coated iron composite powder, it can account at weight ratio, the zinc stearate A of pH value, copper sulphate and the reduced iron powder of copper-bath under the situation of new span of content that copper-clad iron or benzotriazole account for the copper-coated iron composite powder gross weight, be coated on the ferrous powder granules in the same old way with not only can making the even close and firm of copper, but also improve its oxidation resistance.
The objective of the invention is to realize that by such technical scheme its step is as follows:
(1), and the pH value of the copper-bath of dissolving transferred to 0.1～2.5 with copper sulphate dissolving; The pH value of copper-bath can not be too high, can not be too low, because too high meeting is slowed down reaction speed significantly, cause the production time long, inefficient deficiency, too low meeting causes the iron powder loss excessive, not only influence the quality of product, production cost is significantly improved.So generally transfer between 0.1～2.5, preferably be controlled between 1.5～2.5.
(2) under stirring, add reduced iron powder rapidly, continue to stir 2～10 minutes, make copper be coated on the surface of ferrous powder granules fully, promptly form copper-coated iron composite powder, the weight ratio Y of copper sulphate and reduced iron powder satisfies following condition: 1: 50≤Y＜4: 5 or 4: 5＜Y≤and 1: 1; The weight ratio of copper sulphate and reduced iron powder can optionally dispose according to the copper content of customer requirement.
(3) allow copper-coated iron composite powder sedimentation 1-20 minute, remove supernatant, add the clear water washing, make it no acidic till;
(4) copper-coated iron composite powder after washing is delivered to centrifuge and is carried out processed, carries out drying then, reduction is handled, and sieves according to the specification of product size;
(5) copper-coated iron composite powder after the screening is carried out anti-oxidation processing, promptly add zinc stearate or benzotriazole in copper-coated iron composite powder, the content that zinc stearate A accounts for the copper-coated iron composite powder gross weight satisfies following condition: 0.5 ‰≤A≤20 ‰; The content that benzotriazole B accounts for the copper-coated iron composite powder gross weight satisfies following condition: 0.01 ‰≤B≤1 ‰; Mix powder, check, packing warehouse-in then.
What the present invention mainly adopted is the chemical replacement method, according to electrochemical principle, with reduced iron powder and copper-bath at normal temperatures, pH value is under 0.1～2.5 the effect, makes ferrous powder granules surface and copper-bath generation chemical reaction, its reaction equation is as follows:
Fe+CuSO
4＝＝＝＝＝＝＝Cu+FeSO
4
Thereby make the ferrous powder granules surface evenly, closely coat one deck copper film, obtain shallow rose or henna erose cladding powder by washing, dry reduction again.Owing in course of reaction, all carried out stirring fully, can guarantee that the surface reaction of all reduced iron powder particles is abundant, realize that copper film is coated on the purpose on ferrous powder granules surface fully.
For the cladding speed of accelerating copper-coated iron composite powder better and the tightness degree of cladding, in the described step (2), can in copper-bath, add the 2-mercapto benzothiazole earlier, and then operate by above-mentioned steps (2); Wherein the 2-mercapto benzothiazole X content that accounts for the copper sulphate gross weight satisfies following condition: 0.001 ‰≤X＜0.0283 ‰ or 0.0283 ‰＜X≤1 ‰.
Owing to adopted technique scheme, the present invention can make copper evenly, closely, be coated on the ferrous powder granules fully securely, and guaranteed to place not oxidation in six months, improved its antioxygenic property.
The specific embodiment
The invention will be further described for following embodiment:
Step of the present invention is as follows:
(1), and the pH value of the copper-bath of dissolving transferred to 0.1～2.5 with copper sulphate dissolving;
(2) under stirring, add reduced iron powder rapidly, continue to stir 2～10 minutes, make copper be coated on the surface of ferrous powder granules fully, promptly form copper-coated iron composite powder, the weight ratio Y of copper sulphate and reduced iron powder satisfies following condition: 1: 50≤Y＜4: 5 or 4: 5＜Y≤and 1: 1;
(3) allow copper-coated iron composite powder sedimentation 1-20 minute, remove supernatant, add the clear water washing, make it no acidic till;
(4) copper-coated iron composite powder after washing is delivered to centrifuge and is carried out processed, carries out drying then, reduction is handled, and sieves according to the specification of product size;
(5) copper-coated iron composite powder after the screening is carried out anti-oxidation processing, promptly add zinc stearate or benzotriazole in copper-coated iron composite powder, the content that zinc stearate A accounts for the copper-coated iron composite powder gross weight satisfies following condition: 0.5 ‰≤A≤20 ‰; The content that benzotriazole B accounts for the copper-coated iron composite powder gross weight satisfies following condition: 0.01 ‰≤B≤1 ‰; Mix powder, check, packing warehouse-in then.
In above-mentioned steps (2), in copper-bath, add the 2-mercapto benzothiazole earlier, and then operate by above-mentioned steps (2); Wherein the 2-mercapto benzothiazole X content that accounts for the copper sulphate gross weight satisfies following condition: 0.001 ‰≤X＜0.0283 ‰ or 0.0283 ‰＜X≤1 ‰.
Embodiment 1
Described: the pH value of copper-bath is 0.1,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.001 ‰,
The weight ratio of copper sulphate and reduced iron powder 1: 50,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 0.5 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.01 ‰ to benzotriazole.
Embodiment 2
Described: the pH value of copper-bath is 0.4,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.005 ‰,
The weight ratio of copper sulphate and reduced iron powder 1: 5,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 1 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.05 ‰ to benzotriazole.
Embodiment 3
Described: the pH value of copper-bath is 0.75,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.01 ‰,
The weight ratio of copper sulphate and reduced iron powder 2: 5,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 5 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.1 ‰ to benzotriazole.
Embodiment 4
Described: the pH value of copper-bath is 1.2,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.5 ‰,
The weight ratio of copper sulphate and reduced iron powder 3: 5,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 10 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.5 ‰ to benzotriazole.
Embodiment 5
Described: the pH value of copper-bath is 1.5,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 1 ‰,
The weight ratio of copper sulphate and reduced iron powder 1: 1,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 20 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 1 ‰ to benzotriazole.
Claims (7)
1. the manufacture method of a copper-coated iron composite powder, its step is as follows:
(1), and the pH value of the copper-bath of dissolving transferred to 0.1～2.5 with copper sulphate dissolving;
(2) under stirring, add reduced iron powder rapidly, continue to stir 2～10 minutes, make copper be coated on the surface of ferrous powder granules fully, promptly form copper-coated iron composite powder, the weight ratio Y of copper sulphate and reduced iron powder satisfies following condition: 1: 50≤Y＜4: 5 or 4: 5＜Y≤and 1: 1;
(3) allow copper-coated iron composite powder sedimentation 1-20 minute, remove supernatant, add the clear water washing, make it no acidic till;
(4) copper-coated iron composite powder after washing is delivered to centrifuge and is carried out processed, carries out drying then, reduction is handled, and sieves according to the specification of product size;
(5) copper-coated iron composite powder after the screening is carried out anti-oxidation processing, promptly add zinc stearate or benzotriazole in copper-coated iron composite powder, the content that zinc stearate A accounts for the copper-coated iron composite powder gross weight satisfies following condition: 0.5 ‰≤A≤20 ‰; The content that benzotriazole B accounts for the copper-coated iron composite powder gross weight satisfies following condition: 0.01 ‰≤B≤1 ‰; Mix powder, check, packing warehouse-in then.
2. the manufacture method of copper-coated iron composite powder as claimed in claim 1 is characterized in that in the described step (2), adds the 2-mercapto benzothiazole earlier in copper-bath, and then operates by above-mentioned steps (2); Wherein the 2-mercapto benzothiazole X content that accounts for the copper sulphate gross weight satisfies following condition: 0.001 ‰≤X＜0.0283 ‰ or 0.0283 ‰＜X≤1 ‰.
3. the manufacture method of copper-coated iron composite powder as claimed in claim 2 is characterized in that described:
The pH value of copper-bath is 0.1,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.001 ‰,
The weight ratio of copper sulphate and reduced iron powder 1: 50,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 0.5 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.01 ‰ to benzotriazole.
4. the manufacture method of copper-coated iron composite powder as claimed in claim 2 is characterized in that described:
The pH value of copper-bath is 0.4,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.005 ‰,
The weight ratio of copper sulphate and reduced iron powder 1: 5,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 1 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.05 ‰ to benzotriazole.
5. the manufacture method of copper-coated iron composite powder as claimed in claim 2 is characterized in that described:
The pH value of copper-bath is 0.75,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.01 ‰,
The weight ratio of copper sulphate and reduced iron powder 2: 5,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 5 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.1 ‰ to benzotriazole.
6. the manufacture method of copper-coated iron composite powder as claimed in claim 2 is characterized in that described:
The pH value of copper-bath is 1.2,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 0.5 ‰,
The weight ratio of copper sulphate and reduced iron powder 3: 5,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 10 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 0.5 ‰ to benzotriazole.
7. the manufacture method of copper-coated iron composite powder as claimed in claim 2 is characterized in that described:
The pH value of copper-bath is 1.5,
The content that the 2-mercapto benzothiazole accounts for the copper sulphate gross weight is 1 ‰,
The weight ratio of copper sulphate and reduced iron powder 1: 1,
The content that zinc stearate A accounts for the copper-coated iron composite powder gross weight is 20 ‰, and perhaps to account for the content of copper-coated iron composite powder gross weight be 1 ‰ to benzotriazole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100572317A CN100348351C (en) | 2005-08-18 | 2005-08-18 | Manufacturing method of copper-coated iron composite powder |
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| CNB2005100572317A CN100348351C (en) | 2005-08-18 | 2005-08-18 | Manufacturing method of copper-coated iron composite powder |
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| CN1730209A CN1730209A (en) | 2006-02-08 |
| CN100348351C true CN100348351C (en) | 2007-11-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101088671B (en) * | 2007-07-18 | 2010-10-13 | 重庆扬子粉末冶金有限责任公司 | Brass coated composite iron powder and its production process |
| CN105251996B (en) * | 2015-11-20 | 2017-07-07 | 中南大学 | A kind of core shell structure copper clad iron nano composite powder and preparation method and application |
| CN112846203A (en) * | 2020-12-29 | 2021-05-28 | 有研粉末新材料(合肥)有限公司 | Water atomization preparation method of iron-based composite powder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5475463A (en) * | 1977-11-28 | 1979-06-16 | Nippon Mining Co Ltd | Manufacture of copper coated iron powder |
| JPS5633467A (en) * | 1979-08-22 | 1981-04-03 | Dowa Mining Co Ltd | Copper coating method |
| JPS63183101A (en) * | 1987-01-22 | 1988-07-28 | Nippon Steel Corp | Production of metal-coated powder |
| CN1548261A (en) * | 2003-05-13 | 2004-11-24 | 重庆扬子粉末冶金有限责任公司 | Making process of composite iron-in-copper powder |
-
2005
- 2005-08-18 CN CNB2005100572317A patent/CN100348351C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5475463A (en) * | 1977-11-28 | 1979-06-16 | Nippon Mining Co Ltd | Manufacture of copper coated iron powder |
| JPS5633467A (en) * | 1979-08-22 | 1981-04-03 | Dowa Mining Co Ltd | Copper coating method |
| JPS63183101A (en) * | 1987-01-22 | 1988-07-28 | Nippon Steel Corp | Production of metal-coated powder |
| CN1548261A (en) * | 2003-05-13 | 2004-11-24 | 重庆扬子粉末冶金有限责任公司 | Making process of composite iron-in-copper powder |
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Application publication date: 20060208 Assignee: Chaoyang Kimho Powder Metallurgy Materials Co., Ltd. Assignor: Chongqing Yangtze Powder Metallurgy Co., Ltd. Contract record no.: 2010210000010 Denomination of invention: Making process of composite iron-in-copper powder Granted publication date: 20071114 License type: Exclusive License Record date: 20100303 |
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