Preparation method of nano Ag-SnO2 electric contact composite

An electrical contact material, ag-sno2 technology, applied in the direction of contacts, circuits, electrical switches, etc., can solve the problems of the interface problem is not well solved, ball milling media pollution, long production cycle and other problems, to eliminate SnO2 particle isolation The effect of tape production, improved bond strength, improved compatibility

Active Publication Date: 2012-09-19
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes also have some deficiencies. For example, tin oxide in the powder metallurgy process is added by external mechanical force, which is likely to cause ball milling medium pollution; internal oxidation and chemical precipitation methods have high requirements for equipment, long production cycle, and high cost. high
[0003] After searching the prior art, it was found that the patent annou...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 After the silver-tin oxide composite particles with a tin oxide content of 90% are mixed with pure silver powder in a weight ratio of 1:2, the tin oxide content is reduced to 30%.

[0029] First, the preparation of SnO 2 The specific method of the precursor solution is as follows: get 1g of tin protochloride dihydrate, add 10g of ethanol therein, after dissolving completely, then slowly add 20g of water, the solution becomes a colloidal (SnCl 2 2H 2 O: ethanol: water=1: 10: 20, weight ratio);

[0030] Then, add 0.117g silver nitrate, dissolve and obtain silver nitrate solution (silver nitrate: SnCl 2 2H 2 O=0.117: 1, weight ratio);

[0031] Adjust pH=7 with NaOH, co-precipitate by ultrasonic method (300W, 50kHz), filter and dry the obtained precipitate to obtain Ag-SnO with a tin oxide content of 90%. 2 nanocomposite particles;

[0032]After mixing the nanocomposite particles and silver powder in a weight ratio of 1:2, carry out cold isostatic pressing a...

Embodiment 2

[0034] Example 2 After the silver-tin oxide composite particles with a tin oxide content of 60% are mixed with pure silver powder in a weight ratio of 1:4, the tin oxide content is reduced to 12%.

[0035] First, the preparation of SnO 2 The specific method of the precursor solution is as follows: get the tin protochloride dihydrate of 5g, add the ethanol of 75g wherein, after dissolving completely, then slowly add the water of 150g, the solution becomes the colloid (SnCl 2 2H 2 O: ethanol: water=1: 15: 30, weight ratio);

[0036] Then, add 3.5g silver nitrate, dissolve and obtain silver nitrate solution (silver nitrate: SnCl 2 2H 2 O=0.7:1, weight ratio);

[0037] Adjust the pH=8 with ammonia water, co-precipitate (200W, 100kHz) by ultrasonic method, filter and dry the obtained precipitate, and obtain Ag-SnO with a tin oxide content of 60%. 2 nanocomposite particles;

[0038] Ag-SnO 2 After the nanocomposite particles and silver powder were mixed in a weight ratio of 1...

Embodiment 3

[0040] Embodiment 3 is by the composite particle of tin oxide content 30%, after 1: 5 mixes with pure silver powder, drops to 5%

[0041] First, the preparation of SnO 2 The specific method of the precursor solution is as follows: get the tin protochloride dihydrate of 5g, add the ethanol of 100g wherein, after dissolving completely, then slowly add the water of 200g, the solution becomes the colloidal (SnCl 2 2H 2 O: ethanol: water=1: 20: 40, weight ratio);

[0042] Then, add 12.25g silver nitrate, dissolve and obtain silver nitrate solution (silver nitrate: SnCl 2 2H 2 O=2.45: 1, weight ratio);

[0043] Adjust pH=10 with ammonia water, co-precipitate by ultrasonic method (100W, 20kHz), filter and dry the obtained precipitate, and obtain Ag-SnO with a tin oxide content of 30%. 2 nanocomposite particles;

[0044] Ag-SnO 2 After the nanocomposite powder and silver powder are mixed in a weight ratio of 1:5, cold isostatic pressing is carried out at a pressure of 300 MPa. ...

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PUM

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Abstract

The invention discloses a preparation method of a nano Ag-SnO2 electric contact composite, which comprises the steps of: preparing a sol solution by using stannous chloride dehydrate as a raw material, adding a silver nitrate solution, controlling Sn<2+> sol particles and Ag<+> ions in the solution to generate a chemical reaction in situ through regulating a pH value so to prepare Ag-SnO2 intermediate composite particles with the content of SnO2 of 10-90 percent; then mixing the Ag-SnO2 intermediate composite particles with pure silver powder, reducing the SnO2 content to 5-30 percent; and pressing, sintering and thermally extruding to obtain the electric contact composite with nano SnO2 reinforced phase particles in a funicular distribution state in a matrix. Sol and gel are combined to generate the chemical reaction; and by the assistance of ultrasonic waves, the particle diameter (nano level) of the Ag particles and the SnO2 particles in the intermediate particles and the dispersion distribution of the Ag particles and the SnO2 particles are controlled effectively, the compatibility of the matrix and the reinforced phase is improved, and the interface binding strength of the matrix and the reinforced phase is improved.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact material, in particular to a nano Ag-SnO 2 Preparation method of electrical contact composite material. Background technique [0002] Ag-SnO 2 It is recognized as the most promising environment-friendly electrical contact functional composite material to replace Ag-CdO. However, SnO 2 It has good thermal stability, and it is not easy to decompose when it is subjected to the action of an arc. In addition, it has poor wettability with molten liquid Ag, and has a large density difference with Ag, so it is easy to float to the surface of the contact to form enrichment. Due to SnO 2 Non-conductive, resulting in an increase in the contact resistance of the contacts, resulting in a rise in temperature and affecting the performance of the electrical appliance. At the same time, Ag-SnO 2 At present, the material still has disadvantages such as low elongation and difficult processing an...

Claims

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Application Information

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IPC IPC(8): H01H1/0237C22C32/00C22C1/05
Inventor 陈乐生陈宇航穆成法吴新合
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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