CN110629135B - Preparation method of nickel-silver alloy material - Google Patents
Preparation method of nickel-silver alloy material Download PDFInfo
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- CN110629135B CN110629135B CN201911000854.9A CN201911000854A CN110629135B CN 110629135 B CN110629135 B CN 110629135B CN 201911000854 A CN201911000854 A CN 201911000854A CN 110629135 B CN110629135 B CN 110629135B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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Abstract
The invention provides a preparation method of a nickel-silver alloy material, which comprises the steps of stacking metal silver sheets above a foamed nickel material in a completely overlapped mode, then feeding the metal silver sheets into a heat treatment furnace filled with hydrogen at a certain feeding speed for heat treatment, dividing the heat treatment furnace into a first temperature zone, a second temperature zone and a third temperature zone from an inlet to an outlet in sequence, controlling the temperature of the first temperature zone to be 650-750 ℃, the heat treatment time of the first temperature zone to be 2-5 min, controlling the temperature of the second temperature zone to be 750-850 ℃, controlling the heat treatment time of the second temperature zone to be 5-8 min, controlling the temperature of the third temperature zone to be 960-1050 ℃, controlling the heat treatment time of the third temperature zone to be more than 10min, and cooling to obtain the nickel-silver alloy material. The method has the advantages of simple process and less pollution, and the prepared nickel-silver alloy material has lower resistance and higher elongation.
Description
Technical Field
The invention relates to a preparation method of a nickel-silver alloy material.
Background
In modern civilization, automobiles have become indispensable transportation vehicles for human beings. However, while the automobile industry is rapidly developing and the automobile yield and keeping quantity are continuously increasing, the automobile also brings air pollution, namely automobile exhaust pollution. Gasoline can release various harmful substances in the combustion process, such as pollutants of nitrogen oxide, carbon monoxide, hydrocarbon and the like, wherein the nitrogen oxide causes people to be more toxic than the carbon monoxide, damages eyes and lungs of people, forms photochemical smog, is a main substance for generating acid rain, can change plants from green to brown to death in a large area, and causes the most direct result of global warming; carbon monoxide can block the blood absorption and oxygen transmission of human body, influence the hematopoietic function of human body, and possibly induce angina, coronary heart disease and other diseases at any time; hydrocarbons form highly toxic photochemical smog, harm human bodies, and generate carcinogens. Therefore, new actions to protect and decontaminate our planet are urgently needed. The most direct way is to eliminate the automobile exhaust, thus deriving an exhaust catalytic converter.
In research and development of the past, the foamed nickel material becomes a catalyst carrier of an automobile catalyst converter, a catalytic combustion and diesel vehicle soot purifier due to the characteristics of unique open-cell structure, low-pressure input holes, inherent tensile strength, excellent heat conduction capacity, large specific surface area, electric conductivity, thermal shock resistance and the like. However, with the increasing requirements of the catalyst carrier on the resistance and elongation, the existing foam metal can not completely meet the requirements of customers. Therefore, the search for a foam metal composite material with better performance and a preparation method thereof becomes an important research direction at present.
Disclosure of Invention
The invention aims to provide a preparation method of a nickel-silver alloy material with simple process and less pollution.
The invention is realized by the following scheme:
a preparation method of a nickel-silver alloy material comprises the steps of stacking metal silver sheets above a foamed nickel material in a completely overlapped mode, then feeding the metal silver sheets into a heat treatment furnace filled with hydrogen at a certain feeding speed for heat treatment, dividing the heat treatment furnace into a first temperature area, a second temperature area and a third temperature area from an inlet to an outlet in sequence, controlling the temperature of the first temperature area to be 650-750 ℃, controlling the heat treatment time of the first temperature area to be 2-5 min, controlling the temperature of the second temperature area to be 750-850 ℃, controlling the heat treatment time of the second temperature area to be 5-8 min, controlling the temperature of the third temperature area to be 960-1050 ℃, controlling the heat treatment time of the third temperature area to be more than 10min, and cooling to obtain the nickel-silver alloy material. The first temperature zone of the heat treatment furnace is mainly used for surface preheating of the foamed nickel material and the metal silver sheet, the second temperature zone is mainly used for keeping the temperatures of the foamed nickel material and the metal silver sheet consistent and gradually raising the temperature, and the third temperature zone is mainly used for melting the metal silver sheet, so that the melted silver permeates into the inner cavity of the rib of the foamed nickel material and diffuses to complete filling of the metal silver.
Further, protective gas is continuously filled into an inlet and an outlet of the heat treatment furnace, and the filling flow rate of the protective gas is 0.1-0.3 m3And/min. The protective gas is generally nitrogen or inert gas, and the inert gas is argon, helium and the like.
Further, the volume of the hydrogen gas accounts for 60-80% of the volume of the inner cavity of the heat treatment furnace.
Further, the thickness of the metal silver sheet is 0.1-1.0 mm; the surface density of the foamed nickel material is 250-450 g/m2The thickness is 0.1 to 5.0 mm.
Further, the feeding speed is controlled to be 0.2-0.4 m/min.
The preparation method of the nickel-silver alloy material has simple process, adopts the method that the metal silver sheet is directly melted and infiltrated into the inner cavity of the rib of the foam nickel material, does not use silver-containing chemical solution and the like, and has less pollution to the environment. The nickel-silver alloy material prepared by the method has smaller resistance per unit area and slightly improved elongation rate while not reducing the tensile strength and the specific surface area of the foamed nickel material, improves the heat conductivity and the electric conductivity of the nickel-silver alloy material, and is more suitable for catalyst carriers.
Drawings
Fig. 1 is a partially enlarged microscopic structure view of a nickel-silver alloy material prepared by the method of example 1.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the description of the examples.
Example 1
A method for preparing nickel-silver alloy material comprises stacking 0.3mm thick metallic silver sheets on top of 1.0mm thick nickel foam material with area density of 320 g/square meter in a completely overlapping manner, feeding into a heat treatment furnace filled with hydrogen at a feeding speed of 0.4m/min for heat treatment, wherein the volume of hydrogen is 60% of the volume of the inner cavity of the heat treatment furnace, and the inlet and outlet of the heat treatment furnace are both at 0.2m3Continuously filling nitrogen gas at a flow rate of/min, sequentially dividing the heat treatment furnace from an inlet to an outlet into a first temperature zone, a second temperature zone and a third temperature zone, controlling the temperature of the first temperature zone to be 700 ℃, the heat treatment time of the first temperature zone to be 3min, the temperature of the second temperature zone to be 800 ℃, the heat treatment time of the second temperature zone to be 6min, and the temperature of the third temperature zone to be 1000 DEG CAnd controlling the heat treatment time in the third temperature zone to be 15min, and cooling to obtain the nickel-silver alloy material.
The filling condition of the silver metal in the inner cavity of the nickel rib made of the foamed nickel material is observed by placing the nickel-silver alloy material prepared by the method in example 1 under an electron microscope, as shown in fig. 1, wherein the outermost black part is a resin part for assisting electron microscope test, the middle gray part is a nickel rib frame, and the innermost white part is metal silver, as can be seen from fig. 1, the filling amount of the metal silver in the inner cavity of the nickel rib made of the foamed nickel material is 100%, that is, the inner cavity of the nickel rib made of the foamed nickel material is filled with the metal silver.
The nickel-silver alloy material prepared by the method of example 1 and the foamed nickel material were subjected to performance tests, and the test results are shown in table 1.
TABLE 1
As can be seen from table 1, the nickel-silver alloy material prepared by the method in example 1 has a smaller resistance per unit area, a higher tensile strength and a larger elongation rate under the condition that the surface density, the thickness, the specific surface area and the porosity are basically unchanged, and meets the design requirements.
Example 2
A method for preparing a nickel-silver alloy material, which comprises substantially the same steps as those of the method for preparing a nickel-silver alloy material of example 1, except that:
1. the thickness of the metal silver sheet is 0.6mm, the surface density of the foam nickel material is 400 g/square meter, and the thickness is 2.0 mm;
2. the feeding speed is 0.3m/min, and the volume of the hydrogen accounts for 70 percent of the volume of the inner cavity of the heat treatment furnace; the inlet and outlet of the heat treatment furnace are both 0.1m3Continuously filling argon gas at a flow rate of/min;
3. the temperature of the first temperature zone is controlled to be 750 ℃, the heat treatment time of the first temperature zone is controlled to be 2min, the temperature of the second temperature zone is controlled to be 850 ℃, the heat treatment time of the second temperature zone is controlled to be 5min, the temperature of the third temperature zone is controlled to be 1050 ℃, and the heat treatment time of the third temperature zone is controlled to be 12 min.
The filling condition of the silver metal in the inner cavity of the nickel rib made of the foamed nickel material is observed under an electron microscope by placing the nickel-silver alloy material prepared by the method in the embodiment 2, and the observation shows that the filling amount of the silver metal in the inner cavity of the nickel rib made of the foamed nickel material is 100%, namely the inner cavity of the nickel rib made of the foamed nickel material is filled with the silver metal.
The nickel-silver alloy material prepared by the method of example 2 and the foamed nickel material were subjected to performance tests, and the test results are shown in table 2.
TABLE 2
As can be seen from table 2, the nickel-silver alloy material prepared by the method in example 2 has a smaller resistance per unit area, a higher tensile strength and a larger elongation rate under the condition that the surface density, the thickness, the specific surface area and the porosity are basically unchanged, and meets the design requirements.
Example 3
A method for preparing a nickel-silver alloy material, which comprises substantially the same steps as those of the method for preparing a nickel-silver alloy material of example 1, except that:
1. the thickness of the metal silver sheet is 1mm, the surface density of the foam nickel material is 280 g/square meter, and the thickness is 3.0 mm;
2. the feeding speed is 0.2m/min, and the volume of the hydrogen accounts for 80 percent of the volume of the inner cavity of the heat treatment furnace; the inlet and outlet of the heat treatment furnace are both 0.3m3Continuously filling nitrogen gas at a flow rate of/min;
3. the temperature of the first temperature zone is controlled to be 650 ℃, the heat treatment time of the first temperature zone is controlled to be 5min, the temperature of the second temperature zone is controlled to be 750 ℃, the heat treatment time of the second temperature zone is controlled to be 8min, the temperature of the third temperature zone is controlled to be 960 ℃, and the heat treatment time of the third temperature zone is controlled to be 20 min.
The filling condition of the silver metal in the inner cavity of the nickel rib is observed by placing the nickel-silver alloy material prepared by the method in the embodiment 3 under an electron microscope, and the observation shows that the filling amount of the silver metal in the inner cavity of the nickel rib made of the foamed nickel material is 100%, and the inner cavity of the nickel rib made of the foamed nickel material is filled with the silver metal.
The nickel-silver alloy material prepared by the method of example 3 and the foamed nickel material were subjected to performance tests, and the test results are shown in table 3.
TABLE 3
As can be seen from table 3, the nickel-silver alloy material prepared by the method in example 3 has a smaller resistance per unit area, a higher tensile strength and a larger elongation rate under the condition that the surface density, the thickness, the specific surface area and the porosity are basically unchanged, and meets the design requirements.
Claims (5)
1. A preparation method of a nickel-silver alloy material is characterized by comprising the following steps: the method comprises the steps of stacking metal silver sheets above a nickel foam material in a completely overlapped mode, then feeding the metal silver sheets into a heat treatment furnace filled with hydrogen at a certain feeding speed for heat treatment, wherein the heat treatment furnace is divided into a first temperature zone, a second temperature zone and a third temperature zone from an inlet to an outlet in sequence, the temperature of the first temperature zone is controlled to be 650-750 ℃, the heat treatment time of the first temperature zone is controlled to be 2-5 min, the temperature of the second temperature zone is controlled to be 750-850 ℃, the heat treatment time of the second temperature zone is controlled to be 5-8 min, the temperature of the third temperature zone is controlled to be 960-1050 ℃, the heat treatment time of the third temperature zone is controlled to be more than 10min, and cooling is carried out to obtain the.
2. The method for preparing the nickel-silver alloy material according to claim 1, wherein: protective gas is continuously filled into the inlet and the outlet of the heat treatment furnace, and the filling flow rate of the protective gas is 0.1-0.3 m3/min。
3. The method for preparing the nickel-silver alloy material according to claim 1, wherein: the volume of the hydrogen gas accounts for 60-80% of the volume of the inner cavity of the heat treatment furnace.
4. The method for preparing the nickel-silver alloy material according to claim 3, wherein: the thickness of the metal silver sheet is 0.1-1.0 mm; the surface density of the foamed nickel material is 250-450 g/m2The thickness is 0.1 to 5.0 mm.
5. The method for preparing the nickel-silver alloy material according to any one of claims 1 to 4, wherein the method comprises the following steps: the feeding speed is controlled to be 0.2-0.4 m/min.
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| CN1109765C (en) * | 2000-02-29 | 2003-05-28 | 中南工业大学 | Nickel-silver alloy and its preparing method |
| JP4864195B2 (en) * | 2000-08-30 | 2012-02-01 | 三井金属鉱業株式会社 | Coated copper powder |
| CN103153447B (en) * | 2010-08-30 | 2016-01-20 | 荷兰能源建设基金中心 | For the new kind crystal method of the selective rete of deposition of thin |
| WO2012077550A1 (en) * | 2010-12-08 | 2012-06-14 | 住友電気工業株式会社 | Metallic porous body having high corrosion resistance and method for manufacturing same |
| CN105714135A (en) * | 2014-12-01 | 2016-06-29 | 中国科学院兰州化学物理研究所 | Preparation method of Ni-Al based low friction and abrasion resistant composite material |
| CN107119248A (en) * | 2017-05-23 | 2017-09-01 | 哈尔滨工业大学 | A kind of preparation method of graded porous structure foam metal |
| EP3654429A4 (en) * | 2017-07-14 | 2021-04-07 | Sumitomo Electric Industries, Ltd. | Metal porous body, solid oxide fuel cell and method for manufacturing said metal porous body |
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