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Method for continuously and homogeneously preparing silver tin oxide material

A technology of silver tin oxide and tin oxide, applied in electrical components, electric switches, circuits, etc., can solve the problem of insufficient wettability between tin dioxide and silver matrix materials, uneven distribution of tin dioxide powder, and easy occurrence of macro and micro cracks and other problems, to achieve the effect of easy extrusion, low cost and excellent plastic processing performance

Inactive Publication Date: 2012-03-28
佛山通宝精密合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the preparation of silver tin oxide contact materials by powder metallurgy has been developed rapidly, but in view of the current situation, there are still the following deficiencies in the preparation of silver tin oxide electrical contacts by powder metallurgy: (1) the distribution of tin dioxide powder is not uniform enough, Aggregation; (2) Insufficient wettability of tin dioxide and silver matrix materials, weak intergranular bonding, prone to macro and micro cracks during use, and poor processability; (3) Material properties are inconsistent between batches

Method used

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  • Method for continuously and homogeneously preparing silver tin oxide material
  • Method for continuously and homogeneously preparing silver tin oxide material
  • Method for continuously and homogeneously preparing silver tin oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: Preparation of silver tin oxide (10) material

[0008] (1) Weigh 0.762 kg of tin oxide powder with a particle size of 1-2 um to prepare a slurry, add an activator, turn on the ultrasonic vibrator, and perform homogenization treatment for 10-20 minutes. Finally, the concentration of the prepared slurry is 30%.

[0009] (2) Weigh 10 kilograms of silver nitrate crystals and prepare a silver nitrate solution with a concentration of 5%. At the same time, the tin oxide slurry is added to the silver nitrate solution and stirred by an ultrasonic vibrator for 30 minutes to form a uniform mixed solution.

[0010] (3) Prepare an appropriate amount of 2% ascorbic acid solution.

[0011] (4) Simultaneously extract the mixed solution of silver nitrate and tin oxide and ascorbic acid solution in the storage tank through two pumps, use a valve to control the flow rate of 300L / h, and transport it to the reactor from the left side of the reactor at the same time, and react...

Embodiment 2

[0018] Embodiment 2: Preparation of silver tin oxide (12) material

[0019] (1) Weigh 1.361 kg of tin oxide powder with a particle size of 3-5 um to prepare a slurry, add an activator, turn on the ultrasonic vibrator, and perform homogenization treatment for 10-20 minutes. Finally, the concentration of the prepared slurry is 25%.

[0020] (2) Take by weighing 15 kilograms of silver nitrate crystals, prepare a silver nitrate solution with a concentration of 4%, add the tin oxide slurry into the silver nitrate solution, and stir for 30 minutes by an ultrasonic vibrator to make a uniform mixed solution.

[0021] (3) Prepare an appropriate amount of 5% ascorbic acid solution.

[0022] (4) remaining process is identical with embodiment 1.

[0023] The chemical composition of the product was tested, and the average silver content was 87.6%. The metallographic examination and processing performance analysis of the wire rod showed that the prepared wire rod product also had good st...

Embodiment 3

[0024] Embodiment 3: Preparation of silver tin oxide (15) material

[0025] (1) Weigh 0.9 kg of tin oxide powder with a particle size of 4-6 um to prepare a slurry, add an activator, turn on the ultrasonic vibrator, and perform homogenization treatment for 10-20 minutes. Finally, the concentration of the prepared slurry is 20%.

[0026] (2) Weigh 8 kg of silver nitrate crystals and prepare it as a silver nitrate solution with a concentration of 4%. At the same time, the tin oxide slurry is added to the silver nitrate solution and stirred by an ultrasonic vibrator for 30 minutes to form a uniform mixed solution.

[0027] (3) Prepare an appropriate amount of 5% ascorbic acid solution.

[0028] (4) remaining process is identical with embodiment 1.

[0029] The chemical composition of the product was tested, and the average silver content was 85.1%. The metallographic examination of the wire rod shows that compared with Example 1 and Example 2, the proportion of oxides containe...

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Abstract

The invention discloses a method for continuously and homogeneously preparing a silver tin oxide material, and the method comprises the following steps: firstly, homogenizing a tin oxide sizing agent; preparing a silver nitrate solution according to a content ratio of silver and tin oxide; mixing the silver nitrate solution with the tin oxide sizing agent; respectively injecting a sizing agent mixture and an ascorbic acid solution into a rotary type reaction kettle; reacting while splashing and rotating, and additionally utilizing an ultrasonic vibrator to homogenize, thereby acquiring uniformly distributed silver tin oxide powder; and molding and then preparing into an electrical contact. The method can be used for overcoming the difficulties that distribution of tin oxide grains in a silver substrate is not uniform enough, processing and electric properties are unstable, and the like. According to the method, the probability of powder conglobation is efficiently reduced, the distribution of the acquired silver tin oxide powder is more uniform, and the processing property and electric property of the prepared material are better and stable. The process of the method is simple. The method can be applied to continuous production, thereby acquiring products with stable property. The method is suitable for batch production and industrialization production. Preparing processes all meet the environmentally-friendly demand.

Description

technical field [0001] The invention relates to the technical field of electric contact materials, in particular to a preparation method of silver tin oxide material. Background technique [0002] Silver oxide material is the main material for electrical contacts. For a long time, silver oxide contacts used at home and abroad are mostly silver cadmium oxide. Silver cadmium oxide material was once the most important electrical contact material for medium and low voltage switchgear applications. It has excellent arc extinguishing performance and is known as "universal contact" in medium load switches. However, as electrical switches continue to put forward strict performance requirements such as miniaturization, high reliability, and long life for electrical contacts, silver cadmium oxide materials have not only improved in terms of performance indicators such as wear resistance, welding resistance, and arc corrosion resistance. The exposure is obviously insufficient, and the...

Claims

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Application Information

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IPC IPC(8): B22F9/24C22C5/06C22C32/00H01H11/04
Inventor 卢小东周光喆刘润勇许福太饶其峰
Owner 佛山通宝精密合金股份有限公司
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