CN107083514B - A kind of steel alloy - Google Patents
A kind of steel alloy Download PDFInfo
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- CN107083514B CN107083514B CN201710235055.4A CN201710235055A CN107083514B CN 107083514 B CN107083514 B CN 107083514B CN 201710235055 A CN201710235055 A CN 201710235055A CN 107083514 B CN107083514 B CN 107083514B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0207—Using a mixture of prealloyed powders or a master alloy
- C22C33/0228—Using a mixture of prealloyed powders or a master alloy comprising other non-metallic compounds or more than 5% of graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1655—Process features
- C23C18/1658—Process features with two steps starting with metal deposition followed by addition of reducing agent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1655—Process features
- C23C18/1664—Process features with additional means during the plating process
- C23C18/1669—Agitation, e.g. air introduction
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/18—Pretreatment of the material to be coated
- C23C18/1851—Pretreatment of the material to be coated of surfaces of non-metallic or semiconducting in organic material
- C23C18/1872—Pretreatment of the material to be coated of surfaces of non-metallic or semiconducting in organic material by chemical pretreatment
- C23C18/1886—Multistep pretreatment
- C23C18/1893—Multistep pretreatment with use of organic or inorganic compounds other than metals, first
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/31—Coating with metals
- C23C18/38—Coating with copper
- C23C18/40—Coating with copper using reducing agents
- C23C18/405—Formaldehyde
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of steel alloy, the component comprising following mass percent: iron 86-90%, copper facing TiB2‑Al2O3- TiC composite granule 4-5%, zirconium 0.01-0.03%, tungsten carbide 3-4%, manganese 0.7-1.2%, rare earth 0.3-0.5%, molybdenum 0.8-1.0%, chromium-base alloy powder 1.0-1.5%, niobium 0.03-0.06%, phosphorus 0.03-0.05%, sulphur 0.02-0.03%, carbon 0.12-0.2%.Steel alloy of the invention is using the improvement to composite granule, then is equipped with other compositions, is made up of the method for powder metallurgy, so that steel alloy obtained has good impact resistance rate, heat-resisting quantity, wear resistance and corrosion resistance, and service life also has enhancing.
Description
Technical field
The invention belongs to powdered metallurgical material fields, and in particular to a kind of steel alloy.
Background technique
Powder metallurgy low-alloy steel has high intensity, high rigidity and preferable ductility, particularly suitable for making structural material, therefore
It is widely used in national defense industry and civilian industry, especially in automobile, motorcycle, firearms and household electric appliances.With science and technology
The raising that development and people with rapid changepl. never-ending changes and improvements requires product quality, the requirement to material are also higher and higher.In order to improve powder
The performance of metallurgical alloy steel, ingredient design raw material preparation forming technique and sintering method of the domestic and international investigation of materials person in steel alloy
Etc. have conducted extensive research.The present invention improves and is tested by multiple ingredient, provide one on the basis of existing research
Kind ceramic powder copper facing is equipped with the steel alloy of other various metals powder, which has good impact resistance rate, high temperature resistant
Property, wear resistance and corrosion resistance, and service life also has enhancing.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of steel alloy, which has good impact resistance rate, resistance to
High temperatures, wear resistance and corrosion resistance, and service life also has enhancing.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of steel alloy includes following mass percent
Component: iron 86-90%, copper facing TiB2-Al2O3- TiC composite granule 4-5%, zirconium 0.01-0.03%, tungsten carbide 3-4%, manganese
0.7-1.2%, rare earth 0.3-0.5%, molybdenum 0.8-1.0%, chromium-base alloy powder 1.0-1.5%, niobium 0.03-0.06%, phosphorus
0.03-0.05%, sulphur 0.02-0.03%, carbon 0.12-0.2%；Wherein, copper facing TiB2-Al2O3The preparation of-TiC composite granule
Journey are as follows:
1) to TiB2-Al2O3- TiC composite granule carries out surface preparation: a certain amount of composite granule addition acetone is put
It sets and is cleaned by ultrasonic 10-15min in the Ultrasound Instrument sink of 30-50KHz, then be placed on 15% after 3-5 times wash with distilled water
It is roughened 15-20min in HF aqueous solution, carries out sensitization 25-35min with sensitizing solution again after 3-5 times wash with distilled water, use distilled water
15-20min is then activated in activating solution after cleaning 3-5 times, and finally the composite granule after activation is placed in 80 DEG C of drying boxes
Drying to constant weight, for use；Wherein, sensitizing solution group is divided into 15g/L SnCl2, 35ml/L HCl mixed solution；Activating solution component
For 0.05g/L PdCl2、10g/L H3BO3, 5ml/L HCl mixed solution；
2) electroless plating: configuration electrolytic copper plating solution component A first, component A are copper sulphate 10-25g/L, ethylenediamine tetra-acetic acid
Disodium 0.5-1g/L, sodium potassium tartrate tetrahydrate 95-110g/L, sodium hydroxide 25-35g/L, potassium ferrocyanide 1-2g/L, boric acid 5-8g/L
Mixed liquor, then configure 10-30ml/L reducing agent formalin B component, individually store；When chemical plating, by above-mentioned pre- place
TiB after reason2-Al2O3- TiC composite granule is added in component A mixed liquor, then by B component solution and addition composite granule
Component A mixed liquor mixing, stirred using magnetic stirrer, stirring rate 25-35r/min, stir 15-20min after cleaned
Filter, drying to constant weight in 80 DEG C in a vacuum drying oven, obtains copper facing TiB2-Al2O3- TiC composite granule.
Above-mentioned TiB2-Al2O3" it is multiple that self- propagating prepares TiB2Al2O3TiC to the preparation method reference papers of-TiC composite granule
Close the research of powder reinforced aluminum matrix composites ".
The model Cr50 chromium-base alloy powder of the chromium-base alloy powder.
The rare earth is one or both of vanadium, yttrium.
Beneficial effects of the present invention: steel alloy of the invention is using the improvement to composite granule, then is equipped with other compositions, leads to
The method for crossing powder metallurgy is made, so that steel alloy obtained has good impact resistance rate, heat-resisting quantity, wear resistance and resists
Corrosivity, and service life is 1.2-1.5 times of existing similar product.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.In embodiment, iron, zirconium, manganese, rare earth, molybdenum,
Niobium, tungsten carbide, phosphorus, sulphur, carbon, chromium-base alloy powder are Marco Polo's net product.
Embodiment 1
A kind of steel alloy, the component comprising following mass percent:
Iron 88.24%, copper facing TiB2-Al2O3- TiC composite granule 4.5%, zirconium 0.02%, tungsten carbide 3.5%, manganese
1.0%, vanadium 0.5%, molybdenum 0.8%, chromium-base alloy powder 1.2%, niobium 0.04%, phosphorus 0.03%, sulphur 0.02%, carbon 0.15%.
Above-mentioned copper facing TiB2-Al2O3The preparation process of-TiC composite granule are as follows:
1) to TiB2-Al2O3- TiC composite granule carries out surface preparation: 500mL acetone is added in the composite granule of 30g
It is placed in the Ultrasound Instrument sink of 40KHz and is cleaned by ultrasonic 15min, then be placed on 500mL's 15% after 5 times wash with distilled water
It is roughened 20min in HF aqueous solution, carries out sensitization 35min with 500mL sensitizing solution again after 5 times wash with distilled water, it is clear with distilled water
20min is then activated in 500mL activating solution after washing 5 times, and finally the composite granule after activation is placed in 80 DEG C of drying boxes and is dried
It does to constant weight, for use；Wherein, sensitizing solution group is divided into 15g/L SnCl2, 35ml/L HCl mixed solution；Activating solution group is divided into
0.05g/L PdCl2、10g/L H3BO3, 5ml/L HCl mixed solution；
2) electroless plating: configuration electrolytic copper plating solution component A first, component A are copper sulphate 20g/L, ethylenediamine tetra-acetic acid two
The mixed liquor of sodium 1g/L, sodium potassium tartrate tetrahydrate 105g/L, sodium hydroxide 30g/L, potassium ferrocyanide 1g/L, boric acid 7g/L, then match
The reducing agent formalin B component of 30ml/L is set, is individually stored；When chemical plating, by above-mentioned pretreated TiB2-Al2O3-TiC
Composite granule is added in component A mixed liquor, is then mixed B component solution with the component A mixed liquor that composite granule is added, is adopted
It is stirred with magnetic stirrer, stirring rate 35r/min, cleans filtering after stirring 18min, dried in a vacuum drying oven in 80 DEG C
To constant weight, copper facing TiB is obtained2-Al2O3- TiC composite granule.
Through detecting, the technical parameter of steel alloy obtained is as follows: tensile strength 465MPa, yield strength 286MPa make
With 1.33 times that the service life is equivalents.
Embodiment 2
A kind of steel alloy, the component comprising following mass percent:
Iron 88%, copper facing TiB2-Al2O3- TiC composite granule 4%, zirconium 0.03%, tungsten carbide 3.6%, manganese 1.2%, vanadium
0.4%, molybdenum 1.0%, chromium-base alloy powder 1.5%, niobium 0.04%, phosphorus 0.03%, sulphur 0.02%, carbon 0.18%.
Above-mentioned copper facing TiB2-Al2O3The preparation process of-TiC composite granule are as follows:
1) to TiB2-Al2O3- TiC composite granule carries out surface preparation: 500mL acetone is added in the composite granule of 30g
It is placed in the Ultrasound Instrument sink of 45KHz and is cleaned by ultrasonic 12min, then be placed on 500mL's 15% after 4 times wash with distilled water
It is roughened 20min in HF aqueous solution, carries out sensitization 30min with 500mL sensitizing solution again after 4 times wash with distilled water, it is clear with distilled water
20min is then activated in 500mL activating solution after washing 4 times, and finally the composite granule after activation is placed in 80 DEG C of drying boxes and is dried
It does to constant weight, for use；Wherein, sensitizing solution group is divided into 15g/L SnCl2, 35ml/L HCl mixed solution；Activating solution group is divided into
0.05g/L PdCl2、10g/L H3BO3, 5ml/L HCl mixed solution；
2) electroless plating: configuration electrolytic copper plating solution component A first, component A are copper sulphate 25g/L, ethylenediamine tetra-acetic acid two
The mixed liquor of sodium 1g/L, sodium potassium tartrate tetrahydrate 105g/L, sodium hydroxide 30g/L, potassium ferrocyanide 1.5g/L, boric acid 5g/L, then
The reducing agent formalin B component of 30ml/L is configured, is individually stored；When chemical plating, by above-mentioned pretreated TiB2-Al2O3-
TiC composite granule is added in component A mixed liquor, then mixes B component solution with the component A mixed liquor that composite granule is added
It closes, is stirred using magnetic stirrer, stirring rate 30r/min, filtering is cleaned after stirring 20min, in a vacuum drying oven in 80
DEG C drying to constant weight, obtains copper facing TiB2-Al2O3- TiC composite granule.
Through detecting, the technical parameter of steel alloy obtained is as follows: tensile strength 471MPa, yield strength 293MPa make
With 1.41 times that the service life is equivalents.
Claims (3)
1. a kind of steel alloy, which is characterized in that it is passed through the method system of powder metallurgy by the component comprising following mass percent
It is standby to form: iron 86-90%, copper facing TiB2-Al2O3- TiC composite granule 4-5%, zirconium 0.01-0.03%, tungsten carbide 3-4%, manganese
0.7-1.2%, rare earth 0.3-0.5%, molybdenum 0.8-1.0%, chromium-base alloy powder 1.0-1.5%, niobium 0.03-0.06%, phosphorus
0.03-0.05%, sulphur 0.02-0.03%, carbon 0.12-0.2%；Wherein, copper facing TiB2-Al2O3The preparation of-TiC composite granule
Journey are as follows:
1) to TiB2-Al2O3- TiC composite granule carries out surface preparation: a certain amount of composite granule addition acetone is placed on
It is cleaned by ultrasonic 10-15min in the Ultrasound Instrument sink of 30-50KHz, then is placed on 15% HF water after 3-5 times wash with distilled water
It is roughened 15-20min in solution, carries out sensitization 25-35min with sensitizing solution again after 3-5 times wash with distilled water, wash with distilled water
15-20min is then activated in activating solution after 3-5 times, and finally the composite granule after activation is placed in 80 DEG C of drying boxes and is dried
To constant weight, for use；Wherein, sensitizing solution group is divided into 15g/L SnCl2, 35ml/L HCl mixed solution；Activating solution group is divided into
0.05g/L PdCl2、10g/L H3BO3, 5ml/L HCl mixed solution；
2) electroless plating: configuration electrolytic copper plating solution component A first, component A are copper sulphate 10-25g/L, disodium ethylene diamine tetraacetate
0.5-1g/L, sodium potassium tartrate tetrahydrate 95-110g/L, sodium hydroxide 25-35g/L, potassium ferrocyanide 1-2g/L, boric acid 5-8g/L it is mixed
Liquid is closed, the reducing agent formalin B component of 10-30ml/L is then configured, individually stores；When chemical plating, after above-mentioned pretreatment
TiB2-Al2O3- TiC composite granule is added in component A mixed liquor, then by the A group of B component solution and addition composite granule
Divide mixed liquor mixing, stirred using magnetic stirrer, stirring rate 25-35r/min, cleans filtering after stirring 15-20min,
Drying to constant weight in 80 DEG C in vacuum oven, obtains copper facing TiB2-Al2O3- TiC composite granule.
2. a kind of steel alloy according to claim 1, it is characterised in that: the model Cr50 chromium of the chromium-base alloy powder
Base alloy powder.
3. a kind of steel alloy according to claim 1, it is characterised in that: the rare earth is yttrium.
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| CN108531895A (en) * | 2018-03-29 | 2018-09-14 | 西安理工大学 | A method of the electroless deposition copper on aluminum oxide film |
| CN108754323A (en) * | 2018-06-11 | 2018-11-06 | 安徽尼古拉电子科技有限公司 | A kind of high temperature-resistant cable protection pipe alloy steel material |
| CN110629106B (en) * | 2019-11-08 | 2020-07-24 | 沈阳工业大学 | Method for reinforcing nodular cast iron material by using nano SiO2 particles |
| CN114559046B (en) * | 2022-01-26 | 2023-07-25 | 中北大学 | Preparation method of rare earth modified 17-4PH high-strength steel powder for additive manufacturing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090123690A1 (en) * | 2005-01-10 | 2009-05-14 | H.C. Starck Gmbh | Metallic Powder Mixtures |
| CN103878366A (en) * | 2014-04-16 | 2014-06-25 | 湖南大学 | Copper-coated chromium composite powder and preparation method and application thereof |
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| JPS59200743A (en) * | 1983-04-26 | 1984-11-14 | Daido Steel Co Ltd | Sintered alloy steel |
| JPH0753900B2 (en) * | 1986-10-27 | 1995-06-07 | 日産自動車株式会社 | Heat and wear resistant iron-based sintered alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090123690A1 (en) * | 2005-01-10 | 2009-05-14 | H.C. Starck Gmbh | Metallic Powder Mixtures |
| CN103878366A (en) * | 2014-04-16 | 2014-06-25 | 湖南大学 | Copper-coated chromium composite powder and preparation method and application thereof |
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