A kind of preparation method of silver-nickel material for electric contact

Abstract

The invention relates to a preparation method for preparing silver nickel materials by means of electrical contacts. The preparation method is characterized by comprising the following steps of: performing surface ultrasonic chemical coating processing on Ni powder of which the purity is more than 99 percent, wherein elements for coating processing are one or more of zinc, copper, silver and lanthanum, the processing temperature is controlled to be between 60 and 100 DEG C, and the coating amount is between 1 and 30 percent; mixing the coated N powder with Ag powder and trace metal oxide; performing a sintering-extruding process subsequently; and drawing materials into finished products. The preparation method has the key point that a layer of transition element which is used as a contact bridge between Ag and Ni is coated in the surface of the Ni powder, and the interface combination between the Ag and the Ni is improved, so that the contact between the Ag and the Ni is not simple mechanical contact, and Ag and the Ni are well blended together, the densification of materials is facilitated, the sintering temperature is reduced, the machining performance of materials is improved, the electrical life of the materials is prolonged, and the silver nickel materials can be widely used for switches, relays, circuit breakers and the like in low-voltage electrical appliances.

Description

technical field

[0001] The invention relates to the technical field of electric contact material production, in particular to an improved preparation method of silver-nickel material AgNi. Background technique

[0002] With the development of modern industry, silver-based electrical contact materials, as the core components of electrical products, are playing an increasingly important role. During the breaking process, fusion welding cannot occur, excessive temperature cannot be generated, low and stable resistance is required in the contact process, and wear resistance is also required. For the sake of clarity, the materials involved are generally indicated by molecular formulas in the following description. Because AgCdO material can decompose and absorb heat and extinguish arc at high temperature, the electrical service life is long, it has low and stable contact resistance, and it has good processing performance. It is called "universal contact" and is active in various...

Examples

Embodiment 1

[0007] Embodiment 1: Preparation of AgNi(10) material

[0008] (1) Weigh 2 kg of spherical Ni powder with a Fischer particle size of 3 to 7 microns, and place it in a reducing gas atmosphere for reduction treatment. The treatment temperature is 350° C. and the treatment time is 3.5 hours.

[0009] (2) The preparation concentration is 35% copper nitrate solution.

[0010] (3) Turn on the ultrasonic stirring system and constant temperature system, slowly add Ni powder into an appropriate amount of copper nitrate solution, the frequency of the ultrasonic vibrator is 25kHz, the solution temperature is controlled at 80°C, and the entire coating process is controlled within 15 minutes. A CuNi composite powder whose surface is coated with 10% copper element is obtained.

[0011] (4) The CuNi composite powder is dried and diffused annealed, the drying temperature is lower than 80°C, the annealing temperature is 400°C, ammonia decomposition is used as the protective atmosphere, and th...

Embodiment 2

[0016] Embodiment 2: prepare AaNi (15) material

[0017] (1) Weigh 2.5 kg of spherical Ni powder with a Fischer particle size of 3-7 microns, and place it in a reducing gas atmosphere for reduction treatment at a treatment temperature of 450° C. for 2 hours.

[0018] (2) Prepare a 35% lanthanum nitrate solution.

[0019] (3) Turn on the ultrasonic stirring system and constant temperature system, slowly add Ni powder into an appropriate amount of lanthanum nitrate solution, the frequency of the ultrasonic vibrator is 25kHz, the solution temperature is controlled at 90°C, and the entire coating process is controlled within 10 minutes. A LaNi composite powder whose surface is coated with 5% lanthanum element is obtained.

[0020] (4) The LaNi composite powder is dried and diffused annealed, the drying temperature is lower than 80°C, the annealing temperature is 450°C, ammonia decomposition is used as a protective atmosphere, and the temperature is kept for 2 hours.

[0021] (5)...

Embodiment 3

[0023] Embodiment 3: preparation AgNi (10) material

[0024] (1) Weigh 2.3 kg of spherical Ni powder with a Fischer particle size of 3-7 microns, and place it in a reducing gas atmosphere for reduction treatment at a treatment temperature of 400° C. for 2 hours.

[0025] (2) The preparation concentration is 35% copper nitrate, 20% zinc nitrate solution.

[0026] (3) Turn on the ultrasonic stirring system and constant temperature system, slowly add Ni powder into an appropriate amount of copper nitrate and zinc nitrate solution, the frequency of the ultrasonic vibrator is 25kHz, the solution temperature is controlled at 90°C, and the entire coating process is controlled within 10 minutes. A CuZnNi composite powder whose surface is coated with 12% copper element and 4% zinc element is obtained.

[0027] (4) The CuZnNi composite powder is dried and diffused annealed, the drying temperature is lower than 80°C, the annealing temperature is 450°C, ammonia decomposition is used as a...

technical field

[0001] The invention relates to the technical field of electric contact material production, in particular to an improved preparation method of silver-nickel material AgNi. Background technique

[0002] With the development of modern industry, silver-based electrical contact materials, as the core components of electrical products, are playing an increasingly important role. During the breaking process, fusion welding cannot occur, excessive temperature cannot be generated, low and stable resistance is required in the contact process, and wear resistance is also required. For the sake of clarity, the materials involved are generally indicated by molecular formulas in the following description. Because AgCdO material can decompose and absorb heat and extinguish arc at high temperature, the electrical service life is long, it has low and stable contact resistance, and it has good processing performance. It is called "universal contact" and is active in various...

Examples

Embodiment 1

[0007] Embodiment 1: Preparation of AgNi(10) material

[0008] (1) Weigh 2 kg of spherical Ni powder with a Fischer particle size of 3 to 7 microns, and place it in a reducing gas atmosphere for reduction treatment. The treatment temperature is 350° C. and the treatment time is 3.5 hours.

[0009] (2) The preparation concentration is 35% copper nitrate solution.

[0010] (3) Turn on the ultrasonic stirring system and constant temperature system, slowly add Ni powder into an appropriate amount of copper nitrate solution, the frequency of the ultrasonic vibrator is 25kHz, the solution temperature is controlled at 80°C, and the entire coating process is controlled within 15 minutes. A CuNi composite powder whose surface is coated with 10% copper element is obtained.

[0011] (4) The CuNi composite powder is dried and diffused annealed, the drying temperature is lower than 80°C, the annealing temperature is 400°C, ammonia decomposition is used as the protective atmosphere, and th...

Embodiment 2

[0016] Embodiment 2: prepare AaNi (15) material

[0017] (1) Weigh 2.5 kg of spherical Ni powder with a Fischer particle size of 3-7 microns, and place it in a reducing gas atmosphere for reduction treatment at a treatment temperature of 450° C. for 2 hours.

[0018] (2) Prepare a 35% lanthanum nitrate solution.

[0019] (3) Turn on the ultrasonic stirring system and constant temperature system, slowly add Ni powder into an appropriate amount of lanthanum nitrate solution, the frequency of the ultrasonic vibrator is 25kHz, the solution temperature is controlled at 90°C, and the entire coating process is controlled within 10 minutes. A LaNi composite powder whose surface is coated with 5% lanthanum element is obtained.

[0020] (4) The LaNi composite powder is dried and diffused annealed, the drying temperature is lower than 80°C, the annealing temperature is 450°C, ammonia decomposition is used as a protective atmosphere, and the temperature is kept for 2 hours.

[0021] (5)...

Embodiment 3

[0023] Embodiment 3: preparation AgNi (10) material

[0024] (1) Weigh 2.3 kg of spherical Ni powder with a Fischer particle size of 3-7 microns, and place it in a reducing gas atmosphere for reduction treatment at a treatment temperature of 400° C. for 2 hours.

[0025] (2) The preparation concentration is 35% copper nitrate, 20% zinc nitrate solution.

[0026] (3) Turn on the ultrasonic stirring system and constant temperature system, slowly add Ni powder into an appropriate amount of copper nitrate and zinc nitrate solution, the frequency of the ultrasonic vibrator is 25kHz, the solution temperature is controlled at 90°C, and the entire coating process is controlled within 10 minutes. A CuZnNi composite powder whose surface is coated with 12% copper element and 4% zinc element is obtained.

[0027] (4) The CuZnNi composite powder is dried and diffused annealed, the drying temperature is lower than 80°C, the annealing temperature is 450°C, ammonia decomposition is used as a...