CN113102748A - Preparation method of bronze-coated iron composite powder - Google Patents
Preparation method of bronze-coated iron composite powder Download PDFInfo
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- CN113102748A CN113102748A CN202110293619.6A CN202110293619A CN113102748A CN 113102748 A CN113102748 A CN 113102748A CN 202110293619 A CN202110293619 A CN 202110293619A CN 113102748 A CN113102748 A CN 113102748A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
- B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
Abstract
The invention discloses a preparation method of bronze-coated iron composite powder, which comprises the following steps: mixing copper oxide powder, tin dioxide powder and iron powder to obtain mixed powder, adding a dispersion loosening agent for mixing, then carrying out reduction coating on the obtained powder, crushing and screening to obtain bronze coated iron composite powder. The preparation method of bronze-coated iron composite powder provided by the invention has the advantages of simple production process, low production cost, controllable production components, reasonable reduction sequence setting, easiness in crushing and the like, and has a wide application prospect.
Description
Technical Field
The invention relates to the technical field of metal powder preparation, in particular to a preparation method of bronze-coated iron composite powder.
Background
Copper powder and bronze powder are used in oil-impregnated bearings, diamond products, friction materials and the like, either singly or in combination, or are mixed with iron powder for use. But the price is expensive when only copper powder and bronze powder are used; the use of copper powder and bronze powder mixed iron powder inevitably causes component segregation, and the hard iron particles which exist independently inevitably cause adverse effects on products.
In order to solve the above problems, copper-clad iron composite powder has been developed. The existence of the copper-clad iron composite powder reduces the production cost, solves the problem of powder segregation, and improves the product quality because the surface of the iron particle is completely coated with copper. However, the copper-clad iron composite powder still has the problems of poor oxidation resistance, high sintering temperature, incapability of manufacturing high-performance oil-retaining bearings with high rotating speed and the like.
For this reason, related companies continue to develop bronze-coated iron composite powder. The bronze-coated iron composite powder is irregular powder formed by uniformly and firmly coating a layer of bronze alloy on the surface of each iron powder by using iron particles as cores and adopting a special method, and has the characteristics of low cost, good oxidation resistance, low sintering temperature, capability of being used for high-performance oil-retaining bearings and the like.
At present, the preparation method of bronze-coated iron composite powder mainly comprises two methods: the first method is to add tin or copper-tin alloy on the basis of copper-clad iron powder and diffuse the tin or copper-tin alloy in a reducing furnace at the temperature of 400-800 ℃ to form bronze-clad iron composite powder. The second method is to mix copper oxide powder, tin powder and iron powder uniformly and reduce and diffuse the mixture into bronze-coated iron powder at the temperature of 600 ℃ and 800 ℃ in a reduction furnace, and the method has the advantages that the copper-coated iron powder does not need to be prepared firstly, the working procedure is simple, the defects are that the alloy components are uncontrollable, the segregation phenomenon exists, the tin powder is firstly liquefied into tin liquid when the mixed powder of the copper oxide powder, the tin powder and the iron powder enters the furnace, the nearby tin liquid can spontaneously agglomerate into large tin liquid or locally agglomerate or flow into the bottom layer of the mixed powder or adhere to the inner wall of a loading vessel, and the burning loss of the tin at high temperature causes the segregation of the components or uncontrollable components, thereby reducing the production quality. Meanwhile, the mixed powder can be seriously sintered in the furnace due to the high-temperature melting of the tin element to form a hardened state, so that the reduction of copper oxide in the mixed powder by the penetration of reducing atmosphere is not facilitated, and hardened blocks need to be strongly crushed for many times after being discharged from the furnace.
Disclosure of Invention
The invention aims to at least solve one of the technical problems of bronze-coated iron composite powder in the prior art. Therefore, one purpose of the invention is to provide a preparation method of bronze-coated iron composite powder, the other purpose of the invention is to provide bronze-coated iron composite powder prepared by the preparation method, and the third purpose of the invention is to provide application of the bronze-coated iron composite powder.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a preparation method of bronze-coated iron composite powder, which comprises the following steps:
mixing copper oxide powder, tin dioxide powder and iron powder to obtain mixed powder, adding a dispersion loosening agent for mixing, then carrying out reduction coating on the obtained powder, crushing and screening to obtain the bronze coated iron composite powder.
The bronze-coated iron composite powder is prepared by uniformly coating a layer of bronze alloy on the surface of iron particles, so that in the embodiment of the preparation method of the bronze-coated iron composite powder, large-particle base iron powder, small-particle copper oxide powder and small-particle tin dioxide are mixed. The particle size difference exists between the base iron powder and the copper oxide powder and between gaps of the iron powder particles, the copper oxide powder and the tin dioxide powder are filled, namely the copper oxide powder and the tin dioxide powder with smaller particle sizes are uniformly adhered to the surfaces of the iron powder particles with larger particle sizes, and the subsequent reduction coating is easy to perform. Adding a proper amount of dispersion and loosening agent into the mixed powder and uniformly mixing. The first step of mixing is to adhere copper oxide and tin dioxide on the surface of coarse iron powder to facilitate subsequent coating, and the second step of mixing is to mix a dispersion bulking agent in the mixed powder to facilitate subsequent oxidation and crushing. Specifically, the dispersing and loosening agent is added, so that the mixed powder is in a relatively fluffy and loose state, the reducing atmosphere can enter the mixed powder to perform a reducing action, the original mixed powder is not seriously sintered at a high temperature, the mixed powder is easy to break, and the yield is improved.
According to some embodiments of the method for preparing bronze-coated iron composite powder, the particle size of the copper oxide powder and the particle size of the tin dioxide powder are both less than or equal to 45 μm (namely 325 meshes or less).
According to some embodiments of the method for preparing bronze-coated iron composite powder, the particle sizes of the copper oxide powder and the tin dioxide powder are both 38-45 μm.
According to some embodiments of the method for preparing bronze-coated iron composite powder of the present invention, the particle size of the iron powder is 75 μm to 150 μm (i.e., 100 mesh to 200 mesh). The mesh number of the iron powder is selected according to the mesh number of the final bronze-coated iron composite powder product, the particle size of the iron powder is slightly smaller than that of the bronze-coated iron composite powder, for example, if the bronze-coated iron composite powder is-100 meshes, the mesh number of the iron powder can be-120 meshes, the particle size can be increased after the iron powder is changed into the bronze-coated iron powder, and the mesh number of the iron powder of the raw material matrix is smaller than that of the final finished product powder, so that the yield can be improved, and coarse particle oversize products can be reduced.
According to some embodiments of the method for preparing bronze-coated iron composite powder of the present invention, the iron powder is reduced iron powder.
According to some embodiments of the preparation method of bronze-coated iron composite powder, the purities of the copper oxide powder, the tin dioxide powder and the iron powder are all more than or equal to 98%.
According to some embodiments of the preparation method of bronze-coated iron composite powder, the amount of the dispersion bulking agent is 0.3-1% of the mass of the mixed powder. The dosage of the dispersion loosening agent is not suitable to be too high, because the powder needs to be kept hardened to a certain extent after reduction coating, so that the powder can be mutually diffused and has uniform components. When the dosage of the dispersion loosening agent is 0.3-1% of the mass of the mixed powder, the quality and process requirements can be met.
According to some preferred embodiments of the preparation method of bronze-coated iron composite powder, the amount of the dispersion bulking agent is 0.5-0.8% of the mass of the mixed powder.
According to some embodiments of the method for preparing bronze-coated iron composite powder, the dispersion bulking agent is at least one selected from zinc stearate, stearic acid, paraffin wax and polyethylene wax. These kinds of dispersion bulking agents are powders that can be decomposed at medium and low temperatures and have no effect on the mixed powder and the environment.
According to some embodiments of the method for preparing bronze-coated iron composite powder, the particle size of the dispersion bulking agent is less than or equal to 45 μm.
According to some embodiments of the method for preparing bronze-coated iron composite powder, the reduction coating is performed by loading a proper amount of powder into a loading vessel and placing the loading vessel into a reduction furnace for reduction coating.
According to some embodiments of the bronze-coated iron composite powder preparation method of the present invention, the reduction coating is performed at 400 to 750 ℃ in a reducing gas atmosphere. Bronze melting point in bronze-coated iron composite powder is low, bronze coating and binding power are strong, reduction coating temperature of bronze-coated iron cannot be too high, time of a high temperature period cannot be too long, reduction coating temperature can be adjusted according to bronze content of bronze-coated iron, and the highest reduction coating temperature is 750 ℃ in order to avoid serious agglomeration of bronze-coated iron after the bronze-coated iron is discharged from a furnace, serious bronze burning loss, inconvenience in crushing and yield reduction.
In the preparation method of the bronze coated iron composite powder, the reduction time of the reduction coating is determined by the loading capacity of the mixed powder, and the copper oxide and the tin dioxide are completely reduced. According to some embodiments of the bronze-coated iron composite powder preparation method of the present invention, the reduction time of the reduction coating is 1 hour (h) to 3 hours. In some embodiments of the invention, the reduction time for the reduction coating is 120min to 160 min.
According to some embodiments of the method for preparing bronze-coated iron composite powder of the present invention, the reduction furnace used for reduction coating is selected from a push rod furnace, a mesh belt furnace or an atmosphere protection vacuum furnace.
According to some embodiments of the method of making bronze coated iron composite powder of the present invention, the reducing gas comprises at least one of hydrogen, ammonia decomposition gas, carbon monoxide. In some embodiments of the invention, the reducing gas is selected from hydrogen, a mixture of hydrogen and nitrogen, or an ammonia decomposition gas.
According to some embodiments of the bronze-coated iron composite powder preparation method of the present invention, the reduction coating comprises the steps of: firstly heating to T1, and keeping the temperature for 20-60 min (H1); then heating to T2, and preserving the temperature for 30-60 min (H2); continuously heating to T3, and keeping the temperature for 20-80 min (H3); t1 is more than or equal to 400 ℃ and less than or equal to 500 ℃; t2 is more than or equal to 500 ℃ and less than or equal to 650 ℃; t3 is more than or equal to 650 ℃ and less than or equal to 750 ℃.
According to some preferred embodiments of the bronze-coated iron composite powder preparation method of the present invention, the reduction coating comprises the steps of: firstly heating to T1, and keeping the temperature for 20-30 min; then heating to T2, and keeping the temperature for 30-60 min; continuously heating to T3, and keeping the temperature for 60-80 min; t1 is more than or equal to 400 ℃ and less than or equal to 500 ℃; t2 is more than or equal to 600 ℃ and less than or equal to 650 ℃; t3 is more than or equal to 650 ℃ and less than or equal to 750 ℃.
In the preparation method of the bronze coated iron composite powder, the reduction coating adopts a mode of firstly reducing in steps at low temperature and then coating at high temperature. Therefore, the tin has higher activity than copper, copper oxide is reduced preferentially to tin dioxide at low temperature, fine-grained copper oxide is reduced into high-activity copper which is firstly coated on the surface of iron powder preliminarily, copper coated iron powder is formed in a furnace preliminarily, at higher temperature, after the copper oxide is reduced basically, the tin dioxide is reduced into high-activity tin in a reducing atmosphere, as the tin just reduced is in contact with a copper element interface on the surface of the copper coated iron, the tin is combined with the copper quickly, the tin cannot cause component segregation or uncontrollable component due to the formation of liquid tin at high temperature, and the bronze coated iron with uniform components and no segregation is formed.
According to some embodiments of the bronze-coated iron composite powder preparation method of the present invention, the crushing may be secondary or multiple crushing; the crushing can adopt a compound crusher.
In the preparation method of the bronze-coated iron composite powder, the crushed bronze-coated iron composite powder is screened according to the requirements of final products. According to some embodiments of the bronze-coated iron composite powder preparation method of the present invention, the sieving is performed by a sieve of 100-120 meshes. In some embodiments of the invention, the crushed bronze-coated iron composite powder is passed through a 100-mesh screen, and the undersize material enters the next process, and the oversize material can be further crushed.
According to some embodiments of the method for preparing bronze-coated iron composite powder, the method further comprises a step of batching after screening.
In the preparation method of bronze-coated iron composite powder, the batching is specifically to carry out batching on sieved undersize, so that the powder can be further uniform.
According to some embodiments of the preparation method of bronze-coated iron composite powder, an additive may be added in batch, and the additive includes at least one of an antioxidant, a corrosion inhibitor and an antirust agent. The dosage of the additive can be adjusted according to actual needs. In some embodiments of the present invention, Benzotriazole (BTA) is selected as the corrosion inhibitor.
According to some embodiments of the preparation method of bronze-coated iron composite powder, the method further comprises the steps of inspecting and packaging after batching. Wherein, the inspection refers to performance test, such as particle size test. And packaging and warehousing the qualified product.
According to some embodiments of the preparation method of bronze-coated iron composite powder, the bronze-coated iron composite powder comprises the following elements in percentage by mass: 10 to 30 percent of copper, 1 to 3 percent of tin and the balance of iron.
According to some embodiments of the preparation method of bronze-coated iron composite powder, the bronze-coated iron composite powder comprises the following elements in percentage by mass: 15 to 20 percent of copper, 1.5 to 2 percent of tin and the balance of iron.
In the preparation method of the bronze-coated iron composite powder, the copper oxide powder, the tin dioxide powder and the iron powder are mixed according to the proportion of the elements of the bronze-coated iron composite powder to obtain the mixed powder.
The second aspect of the invention provides bronze-coated iron composite powder prepared by the preparation method of the first aspect of the invention.
A third aspect of the invention provides the use of the bronze coated iron composite powder according to the second aspect of the invention in an oil-impregnated bearing, a diamond product or a friction material.
The invention has the beneficial effects that:
the preparation method of bronze-coated iron composite powder provided by the invention has the advantages of simple production process, low production cost, controllable production components, reasonable reduction sequence setting, easiness in crushing and the like, and has a wide application prospect.
Drawings
FIG. 1 is a schematic view of a process for preparing bronze-coated iron composite powder according to an embodiment of the present invention;
FIG. 2 is a drawing of bronze-coated iron composite powder of example 1;
FIG. 3 is a microscopic enlarged view of bronze-coated iron composite powder of example 1;
FIG. 4 is a particle size distribution diagram of bronze-coated iron composite powder of example 1;
FIG. 5 is a scanning electron microscope image of bronze-coated iron composite powder of example 1;
FIG. 6 is an enlarged view of a portion of FIG. 5;
fig. 7 is a schematic diagram of the powder coating condition of fig. 6.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The starting materials, reagents or apparatus used in the examples were obtained from conventional commercial sources unless otherwise specified. Unless otherwise indicated, the testing or testing methods are conventional in the art.
Example 1
The elemental composition of the bronze-coated iron composite powder in this example is shown in table 1, and the powder compounding raw material composition is shown in table 2.
Table 1 example 1 elemental composition of bronze coated iron composite powder
| Element(s) | Copper (Cu) | Tin (Sn) | Iron |
| Mass ratio (wt%) | 20 | 2 | 78 |
Table 2 example 1 formulation of bronze coated iron composite powder
| Name of raw materials | Copper oxide | Tin dioxide | Iron powder | Stearic acid |
| Quality (g) | 250 | 26 | 780 | 5 |
The copper oxide powder and the tin dioxide powder adopted in the embodiment are both-325 meshes, and the purity is more than 98 percent; the iron powder is reduced iron powder with a particle size of-120 meshes and a purity of more than 98 percent.
Referring to the schematic flow chart of the bronze-coated iron composite powder preparation in the attached figure 1, the preparation method of the bronze-coated iron composite powder of the embodiment is described as follows:
after weighing the powder raw materials in table 2, mixing the copper oxide powder, the tin dioxide powder and the iron powder in a mixer, adding stearic acid, mixing uniformly, loading the mixed powder into a boat box, placing the boat box into an atmosphere protection vacuum furnace with program temperature control, vacuumizing, and introducing hydrogen. Set temperature, T1: 400 ℃, H1: 30 min; t2: 600 ℃, H2: 60 min; t3: 750 ℃, H3: and (5) 60 min. Then heating, specifically heating to 400 ℃, and keeping the temperature for 30 min; then heating to 600 ℃, and preserving heat for 60 min; the temperature is continuously increased to 750 ℃ and the temperature is kept for 60 min. And cooling the furnace after the time, and continuously introducing hydrogen during the cooling period. And (5) discharging the cooled steel plate out of the furnace to obtain the bronze iron clad. And (3) crushing the agglomerated bronze coated iron, screening 100 meshes of powder of-100 meshes, combining, testing and inspecting, and packaging to obtain the-100-mesh bronze coated iron composite powder.
Example 2
In the bronze-coated iron composite powder of the embodiment, by mass, the copper element accounts for 18%, the tin element accounts for 1.8%, and the balance is iron, and the stearic acid dispersing and loosening agent accounts for 0.8% of the mixed powder. And weighing the powder according to the calculated weight of the corresponding copper oxide and the corresponding tin dioxide, and uniformly mixing the powder step by step in a mixer to obtain mixed powder. Wherein, the copper oxide powder and the stannic oxide powder are both-400 meshes, and the purity is more than 98 percent; the iron powder is reduced iron powder with a granularity of-150 meshes and the purity of more than 98 percent.
Referring to the preparation steps of example 1, the mixed powder was placed in a boat box, placed in an atmosphere-protected vacuum furnace with programmed temperature control, and after evacuation, a mixed gas of hydrogen and nitrogen was introduced. Set temperature, T1: 500 ℃, H1: 20 min; t2: 650 ℃, H2: 60 min; t3: 700 ℃, H3: and 80 min. And heating to carry out reduction coating. And (3) crushing the agglomerated bronze coated iron, screening 120 meshes of powder of-120 meshes after crushing, combining, testing and inspecting, and packaging to obtain the-120-mesh bronze coated iron composite powder.
Example 3
In the bronze-coated iron composite powder of the embodiment, by mass, the copper element accounts for 15%, the tin element accounts for 1.5%, and the balance is iron, and the stearic acid dispersing and loosening agent accounts for 0.6% of the mixed powder. And weighing the powder according to the calculated weight of the corresponding copper oxide and the corresponding tin dioxide, and uniformly mixing the powder step by step in a mixer to obtain mixed powder. Wherein, the copper oxide powder and the stannic oxide powder are both-400 meshes, and the purity is more than 98 percent; the iron powder is reduced iron powder with a particle size of-120 meshes and a purity of more than 98 percent.
Referring to the preparation procedure of example 1, the mixed powder was loaded into a boat box and placed in a mesh belt reduction furnace, and the first temperature zone was set at 500 ℃, the second temperature zone was set at 600 ℃, the third temperature zone was set at 650 ℃, the fourth temperature zone was set at 730 ℃, and the time of each heating zone was set at 30 min. And introducing ammonia decomposition atmosphere for reduction coating. Crushing the agglomerated bronze-coated iron, sieving the crushed bronze-coated iron with 100 meshes to 100 meshes, combining powder with 100 meshes to 100 meshes, adding Benzotriazole (BTA) serving as a corrosion inhibitor during combining, testing, inspecting and packaging to obtain the-100-mesh bronze-coated iron composite powder.
FIG. 2 is a drawing of-100 mesh bronze-coated iron composite powder prepared in example 1. FIG. 3 is a microscopic enlarged view of bronze-coated iron composite powder prepared in example 1.
The screening test results of the bronze coated iron composite powder of example 1 are shown in table 3.
TABLE 3 screening test results for bronze-coated iron composite powder
The bronze iron-clad composite powder of example 1 was tested to have a flow rate of 35.6 seconds(s) and a bulk ratio of 2.53g/cm3。
Laser particle size analysis is performed on the bronze-coated iron composite powder of example 1, and fig. 4 is a particle size distribution diagram of the bronze-coated iron composite powder of example 1. Through testing, the laser particle size analysis data of the bronze-coated iron composite powder of example 1 are as follows: d10 was 46.554 μm, D25 was 64.089 μm, D50 was 90.922 μm, D75 was 121.280 μm, D90 was 150.319 μm, D100 was 273.793 μm, D (3,2) was 77.711 μm, D (4,3) was 95.119 μm, Span was 1.141, weight specific surface area was 73.533m2In terms of/kg. The results of the particle size distribution are shown in Table 4.
TABLE 4 particle size distribution of bronze-coated iron composite powder
Fig. 5 is a scanning electron microscope image of the bronze-coated iron composite powder of example 1, fig. 6 is a partially enlarged view of fig. 5, and fig. 7 is a schematic diagram of the powder coating condition of fig. 6. According to the results of scanning electron microscope tests, the surface of the iron powder particles is basically coated with a layer of bronze alloy which is freshly reduced and diffused into a tree shape at high temperature to form bronze-coated iron composite powder.
The oxygen content of the raw material reduced iron powder and the bronze-coated iron composite powder prepared in example 1 was tested by an oxygen-nitrogen tester, and the test method was according to GB/T11261-one 2006, where samples were respectively sampled and tested twice, and the test results are shown in table 5.
TABLE 5 oxygen content test results
From the test data it can be seen that: the oxygen content of the raw material reduced iron powder is about 5500ppm, and after copper oxide and tin dioxide are added to prepare bronze coated iron composite powder, the oxygen content is about 3000ppm, so that the copper oxide and the tin dioxide are fully reduced into copper elements and tin elements, and even the raw material iron powder is further reduced.
The bronze-coated iron composite powder provided by the embodiment of the invention can be applied to oil-containing bearings, diamond products or friction materials, and has a wide application prospect.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of bronze-coated iron composite powder is characterized by comprising the following steps: the method comprises the following steps:
mixing copper oxide powder, tin dioxide powder and iron powder to obtain mixed powder, adding a dispersion loosening agent for mixing, then carrying out reduction coating on the obtained powder, crushing and screening to obtain the bronze coated iron composite powder.
2. The preparation method of bronze-coated iron composite powder according to claim 1, characterized in that: the granularity of the copper oxide powder and the granularity of the tin dioxide powder are both less than or equal to 45 mu m; the particle size of the iron powder is 75-150 mu m.
3. The preparation method of bronze-coated iron composite powder according to claim 1, characterized in that: the dosage of the dispersion loosening agent is 0.3-1% of the mass of the mixed powder.
4. The preparation method of bronze-coated iron composite powder according to claim 1, characterized in that: the dispersion bulking agent is at least one of zinc stearate, stearic acid, paraffin and polyethylene wax.
5. The preparation method of bronze-coated iron composite powder according to claim 1, characterized in that: the reduction coating is carried out at 400-750 ℃ in the atmosphere of reducing gas.
6. The preparation method of bronze-coated iron composite powder according to claim 1, characterized in that: the reduction coating comprises the following steps: firstly heating to T1, and keeping the temperature for 20-60 min; then heating to T2, and keeping the temperature for 30-60 min; continuously heating to T3, and keeping the temperature for 20-80 min; t1 is more than or equal to 400 ℃ and less than or equal to 500 ℃; t2 is more than or equal to 500 ℃ and less than or equal to 650 ℃; t3 is more than or equal to 650 ℃ and less than or equal to 750 ℃.
7. The preparation method of bronze-coated iron composite powder according to claim 1, characterized in that: and after screening, the method also comprises a step of batching.
8. The preparation method of bronze-coated iron composite powder according to any one of claims 1 to 7, characterized in that: the bronze-coated iron composite powder comprises the following elements in percentage by mass: 10 to 30 percent of copper, 1 to 3 percent of tin and the balance of iron.
9. Bronze-coated iron composite powder prepared by the preparation method of any one of claims 1 to 8.
10. Use of the bronze coated iron composite powder according to claim 9 in oil-impregnated bearings, diamond articles or friction materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115026294A (en) * | 2022-06-09 | 2022-09-09 | 重庆有研重冶新材料有限公司 | Low-apparent-density dry-method copper-clad iron powder preparation method, copper-clad iron powder and application thereof |
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| 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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| CN102672170A (en) * | 2012-06-12 | 2012-09-19 | 夏德虎 | Bronze-coated iron composite powder |
| CN102794457A (en) * | 2012-03-21 | 2012-11-28 | 朱湖泽 | Method for producing bronze coated iron powder |
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| 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 |
| CN101088669A (en) * | 2007-07-18 | 2007-12-19 | 重庆扬子粉末冶金有限责任公司 | Bronze coated composite iron powder and its production process |
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| CN115026294A (en) * | 2022-06-09 | 2022-09-09 | 重庆有研重冶新材料有限公司 | Low-apparent-density dry-method copper-clad iron powder preparation method, copper-clad iron powder and application thereof |
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