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A kind of preparation method of silver tin oxide electrical contact alloy

A silver tin oxide and electrical contact technology, which is applied in the field of preparation of silver tin oxide electrical contact alloys, can solve the problems of easy agglomeration of tin dioxide, cumbersome preparation process, and easy introduction of impurities, so as to achieve no residue of harmful substances and overcome complicated processes , Anti-welding performance and good arc erosion resistance

Inactive Publication Date: 2016-08-24
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of silver tin oxide electrical contact alloy, which solves the problems of cumbersome preparation process and complex process of the existing electrical contact alloy, and the problems that tin dioxide is easy to agglomerate or easily introduce impurities

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  • A kind of preparation method of silver tin oxide electrical contact alloy

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preparation example Construction

[0022] A kind of preparation method of silver tin oxide electric contact alloy of the present invention, specifically implement according to the following steps:

[0023] Step 1, prepare tin dioxide suspension:

[0024] According to the mass volume ratio of 0.12-0.3:10g / ml, the tin dioxide particles are added to the ethanol aqueous solution with a mass fraction of 10%-30% and stirred evenly to prepare the tin dioxide particle suspension.

[0025] Step 2, prepare tin dioxide, silver nitrate mixed solution:

[0026] Slowly add the tin dioxide suspension prepared in step 1 into a 1 mol / L silver nitrate aqueous solution to obtain a mixed solution of tin dioxide and silver nitrate. The volume ratio of the silver nitrate aqueous solution to the tin oxide particle suspension is 1-1.6:1.

[0027] Step 3, impregnating ashless filter paper:

[0028] Fully soak the ashless filter paper in the mixed solution prepared in step 2 for 2-4 hours.

[0029] Step 4, drying and calcination of ...

Embodiment 1

[0039] Step 1, prepare tin dioxide suspension:

[0040] Add the tin dioxide particles into the ethanol aqueous solution with a mass fraction of 20% according to the mass volume ratio of 0.12:10g / ml and stir evenly to prepare the tin dioxide particle suspension.

[0041] Step 2, prepare tin dioxide, silver nitrate mixed solution:

[0042] Slowly add the tin dioxide suspension prepared in step 1 into a 1 mol / L silver nitrate aqueous solution to obtain a mixed solution of tin dioxide and silver nitrate. The volume ratio of silver nitrate aqueous solution to tin oxide particle suspension is 1:1.

[0043] Step 3, impregnating ashless filter paper:

[0044] Fully soak 10 pieces of ashless filter paper in the mixed solution prepared in step 2 for 3 hours.

[0045] Step 4, drying and calcination of ashless filter paper:

[0046] Put the ashless filter paper impregnated in step 3 into a vacuum drying oven and dry at 90°C until the water evaporates completely to obtain a dry filter ...

Embodiment 2

[0050] Step 1, prepare tin dioxide suspension:

[0051]Add tin dioxide particles into 10% ethanol aqueous solution according to the mass volume ratio of 0.2:10g / ml and stir evenly to prepare tin dioxide particle suspension.

[0052] Step 2, prepare tin dioxide, silver nitrate mixed solution:

[0053] Slowly add the tin dioxide suspension prepared in step 1 into a 1 mol / L silver nitrate aqueous solution to obtain a mixed solution of tin dioxide and silver nitrate. The volume ratio of the silver nitrate aqueous solution to the tin oxide particle suspension is 1.3:1.

[0054] Step 3, impregnating ashless filter paper:

[0055] Fully soak 10 pieces of ashless filter paper in the mixed solution prepared in step 2 for 2 hours.

[0056] Step 4, drying and calcination of ashless filter paper:

[0057] Put the ashless filter paper impregnated in step 3 into a vacuum drying oven and dry at 80°C until the water evaporates completely to obtain a dry filter paper; then put the dry filt...

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Abstract

The invention provides a method for preparing a silver tin oxide electrical contact alloy. The method specifically includes the steps of fully dipping ashless filter paper in a mixed solution of tin dioxide and silver nitrate, drying, calcining and grinding the ashless filter paper into powder and then pressing, sintering and extruding the powder through a traditional process to obtain the silver tin oxide electrical contact alloy. According to the method, the ashless filter paper is used as a template and serves as a dispersion supporter of tin dioxide, the silver nitrate is used as an introduction carrier of silver, silver tin oxide composite powder is prepared through a wet process, and therefore, silver tin oxide alloy is prepared. By means of the method, agglomeration of tin dioxide in a silver substrate can be effectively reduced, alloy performances are improved, meanwhile, the production efficiency is increased, and the preparation cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of material preparation and relates to a method for preparing a silver tin oxide electrical contact alloy. Background technique [0002] AgSnO 2 Electrical contact alloy is a commonly used contact material in low-voltage electrical appliances. It has successfully replaced AgCdO alloy because of its good welding resistance and arc corrosion resistance. It is currently widely used in various relays and circuit breakers. [0003] Currently domestic and foreign production of AgSnO 2 There are two main types of electrical contact alloy technology, one is internal oxidation method and similar pre-oxidation method, for example: 1) Patent "Preparation Method of Silver Tin Oxide Electrical Contact Material" (Application No. CN201410450512.8, Publication No. CN104269296A, publication date 2015.01.07); 2) patent "A method for preparing silver tin oxide contact material by high-pressure oxidation of alloy powder ingot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C5/06B22F9/24
Inventor 付翀仇润红张宇慧刘宁王俊勃杨敏鸽侯锦丽刘松涛
Owner XI'AN POLYTECHNIC UNIVERSITY