CN110592415A

CN110592415A - Three-dimensional porous foam nickel-silver composite material

Info

Publication number: CN110592415A
Application number: CN201911000862.3A
Authority: CN
Inventors: 钟发平; 肖腾彬; 李星; 蒋素斌; 彭为; 周云鹏
Original assignee: CHANGDE LIYUAN NEW MATERIAL Co Ltd
Current assignee: CHANGDE LIYUAN NEW MATERIAL Co Ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2019-12-20
Anticipated expiration: 2039-10-21
Also published as: CN110592415B

Abstract

The invention provides a three-dimensional porous foamed nickel-silver composite material, wherein metal silver is filled in an inner cavity of a nickel rib of the foamed nickel material, the composite material is integrally in a three-dimensional net structure, and the porosity of the composite material is 70-80%. The three-dimensional porous foam nickel-silver composite material has small resistance per unit area, high tensile strength and high elongation rate while the specific surface area of the foam nickel material is not reduced.

Description

Three-dimensional porous foam nickel-silver composite material

Technical Field

The invention relates to a three-dimensional porous foam nickel-silver composite 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 continuous improvement of the performance requirements of the catalyst carrier on resistance and elongation, the existing foam metal material 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 three-dimensional porous foam nickel-silver composite material which does not reduce the specific surface area and has smaller resistance, higher tensile strength and larger elongation.

The invention is realized by the following scheme:

a metal silver is filled in an inner cavity of a nickel rib of a foamed nickel material, the composite material is integrally in a three-dimensional net structure, and the porosity of the composite material is 70-80%.

Furthermore, the filling amount of the metallic silver in the inner cavity of the nickel rib of the foamed nickel material is 100%, that is, the inner cavity of the nickel rib of the foamed nickel material is filled with the metallic silver.

Further, the composite material has the thickness of 0.1-5.0 mm, the surface density of 250-450 g/square meter, the specific surface area of not less than 8 square meters/g and the unit area resistance of 28-40 m omega/mm²Tensile strength of 20 to 40

N/20mm, and elongation of 20-30%.

The three-dimensional porous foam nickel-silver composite material can be prepared by the following method: the method comprises the following 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 area, a second temperature area and a third temperature area from an inlet to an outlet in sequence, the temperature of the first temperature area is controlled to be 650-750 ℃, the heat treatment time of the first temperature area is controlled to be 2-5 min, the temperature of the second temperature area is controlled to be 750-850 ℃, the heat treatment time of the second temperature area is controlled to be 5-8 min, the temperature of the third temperature area is controlled to be 960-1050 ℃, and the heat treatment time of the third temperature area is controlled to be more than 10min, and cooling is.

According to the three-dimensional porous foam nickel-silver composite material, the metal silver is filled in the inner cavity of the nickel rib of the foam nickel material, so that the tensile strength and the specific surface area of the foam nickel material are not reduced, the unit area resistance is small, the tensile strength is high, the elongation is high, the heat conductivity and the electric conductivity of the composite material are improved, and the three-dimensional porous foam nickel-silver composite material is more suitable for a catalyst carrier.

Drawings

Fig. 1 is a partially enlarged microscopic structure view of the three-dimensional porous nickel silver foam composite 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

Stacking metal silver sheets with the thickness of 0.3mm above a nickel foam material with the area density of 320 g/square meter and the thickness of 1.0mm in a completely overlapping mode, and then feeding the metal silver sheets into a heat treatment furnace filled with hydrogen at the feeding speed of 0.4m/min for heat treatment, wherein the volume of the hydrogen accounts forThe volume of the inner cavity of the heat treatment furnace is 60 percent, and the inlet and the outlet of the heat treatment furnace are both 0.2m³And continuously filling nitrogen gas at a flow rate of/min, sequentially 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, controlling the temperature of the first temperature zone to be 700 ℃, controlling the heat treatment time of the first temperature zone to be 3min, controlling the temperature of the second temperature zone to be 800 ℃, controlling the heat treatment time of the second temperature zone to be 6min, controlling the temperature of the third temperature zone to be 1000 ℃, controlling the heat treatment time of the third temperature zone to be 15min, and cooling to obtain the three-dimensional porous foam nickel-silver composite material.

The three-dimensional porous foamed nickel-silver composite material prepared by the method in example 1 is placed under an electron microscope to observe the filling condition of silver metal in the inner cavity of the foamed nickel material nickel rib, 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, and as can be seen from fig. 1, the filling amount of the metal silver in the inner cavity of the foamed nickel material nickel rib is 100%.

The three-dimensional porous foamed nickel-silver composite material (composite material for short) prepared by the method of example 1 and the foamed nickel material are subjected to performance tests, and the test results are shown in table 1.

TABLE 1

As can be seen from table 1, the three-dimensional porous nickel-silver foam composite 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

Essentially the same procedure was followed as in 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 gas accounts for the heat treatment furnace70% of the lumen volume; 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 three-dimensional porous foam nickel-silver composite material prepared by the method in the embodiment 2 is placed under an electron microscope to observe the filling condition of the silver metal in the cavity of the nickel rib, and the observation shows that the filling amount of the metal silver in the cavity of the nickel rib in the foam nickel material is 100%.

The three-dimensional porous foamed nickel-silver composite material (composite material for short) prepared by the method of example 2 and the foamed nickel material are subjected to performance test, and the test results are shown in table 2.

TABLE 2

As can be seen from table 2, the three-dimensional porous nickel silver foam composite 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

Essentially the same procedure was followed as in 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 three-dimensional porous foamed nickel-silver composite material prepared by the method in the embodiment 3 is placed under an electron microscope to observe the filling condition of the silver metal in the cavity of the nickel rib, and the observation shows that the filling amount of the metal silver in the cavity of the nickel rib made of the foamed nickel material is 100%.

The three-dimensional porous foamed nickel-silver composite material (composite material for short) prepared by the method in example 3 and the foamed nickel material are subjected to performance test, and the test results are shown in table 3.

TABLE 3

As can be seen from table 3, the three-dimensional porous nickel silver foam composite 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

1. A three-dimensional porous foam nickel-silver composite material is characterized in that: the metal silver is filled in the inner cavity of the nickel rib of the foamed nickel material, the composite material is integrally in a three-dimensional net structure, and the porosity of the composite material is 70-80%.

2. The three-dimensional porous nickel silver foam composite of claim 1, wherein: the metal silver filling amount of the inner cavity of the nickel rib of the foamed nickel material is 100 percent.

3. The three-dimensional porous nickel silver foam composite of claim 1 or 2, wherein: the composite material has the thickness of 0.1-5.0 mm, the surface density of 250-450 g/square meter, the specific surface area of not less than 8 square meters/g and the unit area resistance of 28-40 m omega/mm²The tensile strength is 20-40N/20 mm, and the elongation is 20-30%.