阅读说明：本技术 镍银合金材料的制备方法 (Preparation method of nickel-silver alloy material ) 是由 钟发平 肖腾彬 李星 蒋素斌 周云鹏 彭为 于 2019-10-21 设计创作，主要内容包括：本发明提供了一种镍银合金材料的制备方法,将金属银片以完全重叠的方式叠放在泡沫镍材料的上方后以一定的进料速度进入充有氢气的热处理炉内进行热处理,所述热处理炉自入口至出口依次划分为第一温区、第二温区和第三温区,第一温区的温度控制为650～750℃,第一温区内热处理时间控制为2～5min,第二温区的温度控制为750～850℃,第二温区内热处理时间控制为5～8min,第三温区的温度控制为960～1050℃,第三温区内热处理时间控制为10min以上,冷却后制得镍银合金材料。本发明方法,工艺简单,污染较小,其制备得到的镍银合金材料具有较小的电阻及较大的延伸率。(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.)

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.

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.