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Silver coating surface modification method of nickel powder for circuit protection device material

A surface modification and circuit protection technology, applied in transportation and packaging, metal processing equipment, coatings, etc., to improve weather resistance and reduce resistivity

Inactive Publication Date: 2017-02-08
杨海波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there has been no report on the silver coating on the surface of ultrafine powder by photoreduction method.

Method used

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  • Silver coating surface modification method of nickel powder for circuit protection device material
  • Silver coating surface modification method of nickel powder for circuit protection device material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Fully dissolve silver nitrate and nickel powder with a molar ratio of 1:4 in ethanol solvent, stir vigorously to form a homogeneous suspension; irradiate the suspension with a 20 W ultraviolet lamp for 1±0.2 min, and the color of the solution changes from white to gray; filter the reacted solution, wash the generated precipitate with deionized water, and then place the separated precipitate in 60 o C±1 oC After heat preservation for 8±2 hours, the silver-coated nickel powder with effectively improved weather resistance can be obtained. Wherein the silver-coated nickel powder has a spherical structure with a diameter of 200±30nm.

Embodiment 2

[0024] Fully dissolve silver nitrate and nickel powder with a molar ratio of 2:4 in ethanol solvent, stir vigorously to form a homogeneous suspension; irradiate the suspension with a 20 W UV lamp for 1±0.2 min, and the color of the solution changes from white to white. gray; filter the reacted solution, wash the generated precipitate with deionized water, and then place the separated precipitate in 60 o C±1 oC After heat preservation for 8±2 hours, the silver-coated nickel powder with effectively improved weather resistance can be obtained. Wherein the silver-coated nickel powder has a spherical structure with a diameter of 200±30nm.

[0025] The SEM of above-mentioned gained silver-coated nickel powder is as figure 1 As shown, it is proved that the silver-coated nickel powder does not change the structure of the nickel powder, and it is still a spherical structure. figure 2 V-diagram of positive temperature coefficient thermistor for circuit protection made of silver-coat...

Embodiment 3

[0027] Fully dissolve silver nitrate and nickel powder with a molar ratio of 1:1 in ethanol solvent, stir vigorously to form a homogeneous suspension; irradiate the suspension with a 20 W ultraviolet lamp for 1±0.2 min, and the color of the solution changes from white to gray; filter the reacted solution, wash the generated precipitate with deionized water, and then place the separated precipitate in 60 o C±1 oC After heat preservation for 8±2 hours, the silver-coated nickel powder with effectively improved weather resistance can be obtained. Wherein the silver-coated nickel powder has a spherical structure with a diameter of 200±30nm.

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Abstract

The invention discloses a silver coating surface modification method of conduction filling nickel powder for a circuit protection device material. Silver-coated nickel powder is prepared by dissolving silver nitrate and the nickel powder in an alcohol solvent and carrying out silver coating on the nickel powder through a photo-induced reduction reaction under irradiation of an ultraviolet lamp. The weather ability of a positive temperature coefficient heat-sensing device, made of the silver-coated nickel powder prepared by the silver coating surface modification method, for circuit protection is improved obviously. The silver coating surface modification method is simple in technology; the physical and chemical properties, such as oxidation resistance, of the nickel powder can be improved effectively, and the application scope of the nickel powder can be extended.

Description

technical field [0001] The invention relates to the technical field of circuit protection devices, in particular to a nickel powder silver-coated surface modification for circuit protection device materials. Background technique [0002] As a conductive filler, fine nickel powder is widely used in positive temperature coefficient thermal devices for circuit protection, which has the advantage of significantly reducing resistivity. However, because the fine nickel powder has a relatively large specific surface area and relatively large surface defects, it has thermodynamic instability, thereby reducing the weather resistance of the positive thermal coefficient thermal sensor. Therefore, suitable surface modification of fine nickel powder, such as coating cobalt, copper, etc., can overcome the shortcomings of fine nickel powder, such as easy oxidation and agglomeration, so as to effectively improve and enhance the physical and chemical properties of fine nickel powder such as ...

Claims

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Application Information

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IPC IPC(8): B22F1/02
CPCB22F1/065B22F1/17
Inventor 杨海波杨海东田健
Owner 杨海波
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