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Preparation method of rod-shaped tin oxide-reinforced silver-based electric contact material

A technology of electrical contact material and tin oxide, which is applied in the direction of circuits, electrical switches, electrical components, etc., can solve the problems of affecting electrical performance and service life, the decline of electrical performance of contacts, and non-wetting of liquid silver to achieve good electrical conductivity The effect of high stability, high yield and high purity

Active Publication Date: 2015-04-08
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Granular SnO is currently the most widely used 2 powder, but granular SnO 2 The powder is easy to agglomerate, it is not easy to disperse evenly on the silver matrix, and the liquid silver is not wet on the surface of the tin oxide, and the tin oxide is easy to gather after the arc action, resulting in a decrease in the electrical properties of the contact, which affects the Ag-SnO 2 The most important reason for the electrical properties and service life of electrical contact materials

Method used

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  • Preparation method of rod-shaped tin oxide-reinforced silver-based electric contact material
  • Preparation method of rod-shaped tin oxide-reinforced silver-based electric contact material
  • Preparation method of rod-shaped tin oxide-reinforced silver-based electric contact material

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Embodiment 1

[0031] This embodiment is to prepare the rod-shaped tin oxide-reinforced silver-based electrical contact material containing 90% silver and 10% tin oxide (mass percentage content), and proceeds according to the following steps:

[0032] 1. Prepare appropriate amounts of 0.1mol / L tin protochloride aqueous solution and 0.1mol / L oxalic acid aqueous solution respectively for standby;

[0033] 2. Mixed solution: According to the molar ratio of stannous chloride and oxalic acid 1:1, take a certain amount of stannous chloride aqueous solution and oxalic acid aqueous solution, quickly pour the stannous chloride aqueous solution into the oxalic acid aqueous solution, and use magnetic stirring to make Mix well and react at room temperature for 30 minutes;

[0034] 3. Separate the precipitate in step 2 by centrifugation, put it in an oven, and dry it at 60°C for 24 hours to obtain the stannous oxalate precursor;

[0035] 4. Put the stannous oxalate precursor into a muffle furnace and ca...

Embodiment 2

[0042] This embodiment is to prepare the rod-shaped tin oxide-reinforced silver-based electrical contact material containing 90% silver and 10% tin oxide (mass percentage content), and proceeds according to the following steps:

[0043] 1. Prepare appropriate amounts of 0.2mol / L stannous chloride aqueous solution and 0.3mol / L oxalic acid aqueous solution respectively for use;

[0044] 2. Mixed solution: According to the molar ratio of stannous chloride and oxalic acid 1:1, take a certain amount of stannous chloride aqueous solution and oxalic acid aqueous solution, quickly pour the stannous chloride aqueous solution into the oxalic acid aqueous solution, and use magnetic stirring to make Mix well, react at room temperature for 120min;

[0045] 3. Separate the precipitate in step 2 by centrifugation, put it in an oven, and dry it at 40°C for 48 hours to obtain the stannous oxalate precursor;

[0046] 4. Put the stannous oxalate precursor into a muffle furnace and calcinate at ...

Embodiment 3

[0053] This embodiment is to prepare the rod-shaped tin oxide-reinforced silver-based electrical contact material containing 90% silver and 10% tin oxide (mass percentage content), and proceeds according to the following steps:

[0054] 1. Prepare suitable amounts of ethanol solution of 0.1mol / L stannous chloride and ethanol solution of 0.2mol / L oxalate respectively for use;

[0055]2. According to the molar ratio of stannous chloride and oxalic acid 1:2, take a certain amount of stannous chloride ethanol solution and oxalate ethanol solution, drop the stannous chloride ethanol solution into the oxalate ethanol solution, and react for 40 minutes;

[0056] 3. Separate the precipitate in step 2 by centrifugation, put it in an oven, and dry it at 60°C for 12 hours to obtain the stannous oxalate precursor;

[0057] 4. Transfer the stannous oxalate precursor into a muffle furnace and calcinate at 500°C for 3 hours to obtain tin oxide powder;

[0058] 5. Use the tin oxide powder an...

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Abstract

The invention provides a preparation method of a rod-shaped tin oxide-reinforced silver-based electric contact material. The preparation method comprises the following steps: (1), preparing a stannous salt solution with certain concentration and an oxalic acid solution with certain concentration; (2), taking a certain amount of stannous salt solution and oxalic acid solution according to the molar ratio of stannous salt to oxalic acid, and mixing to react for certain time; (3), separating out reaction precipitates by centrifugation, and drying the reaction precipitates to obtain a stannous oxalate precursor; (4) incinerating the stannous oxalate precursor to obtain putty powder; (5), preparing silver-coated tin oxide compound power by taking the putty powder and silver nitrate as raw materials according to a chemical coating method; (6) hot-pressing the compound powder into a blank; (7), hot-extruding the blank into a rod; and (8) drawing the rod into a wire material. According to the method, the rod-shaped putty powder is high in yield and high in purity, and the process is simple; the rod-shaped tin oxide is distributed in a electric contact wire material in an oriented manner along the drawing direction; the prepared electric contact material is high in rigidity and has favorable electric conductivity, welding resistance and arc erosion resistance.

Description

technical field [0001] The invention relates to an electric contact material, in particular to a method for preparing a silver-based electric contact material strengthened by rod-shaped tin oxide. Background technique [0002] As we all know, electrical contact materials are important components of contactors, relays, and high and low voltage switches, and their performance directly affects the reliability of the entire switching circuit and the service life of electrical appliances. [0003] Ag-SnO 2 Due to its excellent arc erosion resistance, welding resistance and wear resistance, composite materials have become the most likely electrical contact material to replace toxic Ag-CdO. They have attracted much attention and have been an important research topic in this field. . [0004] Ag-SnO 2 The preparation of composite materials generally adopts powder metallurgy method. SnO 2 The shape and size of the powder have an important influence on the performance of the mate...

Claims

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Application Information

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IPC IPC(8): H01H11/04C22C1/05C22C5/06
CPCH01H11/04B22F3/14B22F3/20B22F2003/208B22F2003/145B22F2302/25B22F2301/255B22F2998/10B22F1/17
Inventor 刘绍宏孙旭东林智杰陈家林蒋昱刘满门谢明李晓东李继光
Owner NORTHEASTERN UNIV
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