A kind of preparation method of superfine sno2 particle reinforced electric contact composite material

A particle-reinforced, composite material technology, used in contacts, circuits, electrical switches, etc., to solve problems such as affecting material properties, uneven distribution of traces, and poor wettability

Active Publication Date: 2016-02-03
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention is also for SnO 2 The surface is treated, but due to the SnO 2 The wettability between the Ag material and the Ag material is poor, so if you want to improve the bonding force between the two materials, you must improve the wettability of the two materials, so you need to add some trace elements, such as Bi2O3, CuO, etc., but if the patent is in the later stage Powder mixing is the addition of trace elements, which will lead to uneven distribution of the added trace elements and affect the performance of the overall material

Method used

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  • A kind of preparation method of superfine sno2 particle reinforced electric contact composite material
  • A kind of preparation method of superfine sno2 particle reinforced electric contact composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] to prepare AgSnO 2 (15) Electric contact material as an example

[0037] In the first step, Ag ingots, Sn ingots and Cu ingots are melted and atomized to prepare AgSnCu powder, wherein the Ag content is 65%, the Sn content is 30%, and the Cu content is 5%.

[0038] In the second step, the atomized powder obtained in the first step is oxidized, and the parameters can be adopted: the oxidation temperature is 650° C., the oxygen pressure is 1.0 MPa, and the oxidation time is 60 hours.

[0039] In the third step, the oxidized powder is sieved to 400 mesh.

[0040] The fourth step is to refine and modify the surface of the sieved powder, wherein the pH of the silver-ammonia complex solution is 13, the concentration of Ag per liter is 80g / L, the stirring speed is 500r / min, and ultrasonic treatment , the ultrasonic frequency is 100kHz, and the power is 1000W.

[0041] The fifth step is to slowly spray the hydrazine hydrate solution using an atomizing device, wherein the con...

Embodiment 2

[0049] to prepare AgSnO 2 (10) Electric contact material as an example

[0050] In the first step, Ag ingots, Sn ingots and Zn ingots are melted and atomized to prepare AgSnZn powder, wherein the Ag content is 89%, the Sn content is 9%, and the Zn content is 2%.

[0051] In the second step, the atomized powder obtained in the first step is oxidized, wherein the oxidation temperature is 350° C., the oxygen pressure is 2 MPa, and the oxidation time is 15 hours.

[0052] The third step is to sieve the oxidized powder to 150 mesh.

[0053] The fourth step is to chemically coat the sieved powder, wherein the reaction solution adopts a silver-ammonia complex solution system, the solution pH=10, the concentration of Ag per liter is 40g / L, and the stirring speed is between 200r / min , and sonicate at a frequency of 70kHz and a power of 800W.

[0054] The fifth step is to slowly spray the hydrazine hydrate solution with an atomizing device, wherein the concentration of the hydrazine ...

Embodiment 3

[0062] to prepare AgSnO 2 (6) Electric contact material as an example

[0063] In the first step, Ag ingots, Sn ingots and CuZn ingots are smelted and atomized to prepare AgSnCuZn powder, wherein the Ag content is 93.5%, the Sn content is 6%, and the CuZn content is 0.5%.

[0064] In the second step, the atomized powder obtained in the first step is oxidized, wherein the oxidation temperature is between 650° C., the oxygen pressure is 1.0 MPa, and the oxidation time is 30 hours.

[0065] The third step is to sieve the oxidized powder to 300 mesh.

[0066] The fourth step is to chemically coat the sieved powder, the pH of the solution is 13, the concentration of Ag per liter is 10g / L, the stirring speed is 350r / min, and ultrasonic treatment is performed, and the ultrasonic frequency is 50kHz. The power is 500W.

[0067] The 5th step, slowly add the hydrazine hydrate solution dropwise, wherein the concentration of the hydrazine hydrate solution is 80wt%, and the dropping rate...

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Abstract

The invention discloses a preparation method of a superfine SnO2 particle-reinforced electric contact material, and the preparation method comprises the following steps of: 1, smelting an Ag ingot, an Sn ingot and an additive X, and atomizing to prepare powder; 2, oxidizing the obtained atomized powder; 3, adding the obtained powder to a silver-ammonia complexing solution in a stirring state, and carrying out ultrasonic processing; 4, adding hydrazine hydrate, smashing the powder, and carrying out surface modification on the powder; 5, sintering the powder which is refined and subjected to the surface modification; and 6, carrying out isostatic pressing, secondary sintering, hot pressing and hot extrusion to obtain the reinforced-phase superfine AgSnO2 electric contact material. The method disclosed by the invention has the advantages of fineness and dispersion uniformity of reinforced-phase granular powder, simple process, convenience for operation, low cost and no special requirement on equipment; and the material prepared through the method disclosed by the invention is more enhanced in welding resistance, arc ablation resistant property and conductivity and has very excellent processing property.

Description

technical field [0001] The invention relates to a method for preparing an electrical contact composite material in the field of material technology, in particular to an ultrafine SnO 2 Particle-reinforced electrical contact composite material and method for its preparation. Background technique [0002] In electrical switches and instruments, the electrical contact composite material is responsible for the on-off current, AgSnO 2 It has excellent resistance to arc erosion, welding resistance, wear resistance, and non-toxicity. It is an environmentally friendly material that is most promising to replace traditional AgCdO. [0003] AgSnO 2 The main preparation methods of electrical contact composite materials are internal oxidation method and powder metallurgy method. The material prepared by internal oxidation method developed in the mid-1970s has a fine grain structure, and the alloy has high strength, arc ablation resistance and fusion welding resistance. However, the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C32/00C22C5/06C22C1/05H01H1/0237
Inventor 陈乐生陈晓陈栋穆成法吴新合张美丽
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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