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Preparation method for high-crystallinity silver powder

A high-crystallinity, spherical technology, applied in the preparation of high-crystallinity spherical silver powder, carbonate or bicarbonate-coated silver carbonate precursor, can solve the problem of reducing the tap density and filling characteristics of silver powder, and the monodispersity of silver powder particles Good monodispersity, wide particle size distribution and good dispersion can be achieved

Active Publication Date: 2014-06-18
宁夏中色新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent is to mechanically mix the silver oxide and the coating to achieve the effect of isolation. Since the method of mechanically mixing the precursor and the coating cannot completely ensure the mutual isolation between the precursors, the monodispersity and sphericity of the obtained silver powder particles Poor; and these phenomena will be more obvious with the increase of heat treatment temperature, and finally reduce the tap density and filling characteristics of silver powder

Method used

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  • Preparation method for high-crystallinity silver powder
  • Preparation method for high-crystallinity silver powder
  • Preparation method for high-crystallinity silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 170g of analytically pure silver nitrate to 1000ml of pure water to dissolve, then add 58.3g of sodium carbonate to 500ml of pure water to dissolve, quickly add the silver nitrate solution to the sodium carbonate solution and stir for 10min, react for 20min, let it stand for clarification, and then suction filter to obtain carbonic acid Silver cake.

[0035] Add 138g of analytically pure potassium carbonate into 130ml of water and stir until dissolved. Add the silver carbonate filter cake to the potassium carbonate solution and stir vigorously to mix, use physical methods to remove the water in the potassium carbonate solution so that the potassium carbonate takes silver carbonate as the nucleus and crystallizes on its surface, and the coated product is suction filtered , The obtained filter cake was dried at 60° C. for 24 hours. The dried product was calcined at 600°C for 1.5h. The calcined product was added into 1000ml of pure water, stirred and washed thoroughl...

Embodiment 2

[0038] Add 85g of analytically pure silver nitrate to 2000ml of pure water to dissolve, then add 30g of sodium carbonate to 1000ml of pure water to dissolve, slowly add silver nitrate solution to it while stirring the sodium carbonate solution, react for 30min, let it stand for clarification, and then suction filter to obtain Silver Carbonate Filter Cake.

[0039] Add 65g of sodium bicarbonate into 620ml of water and stir to dissolve, then add the silver carbonate filter cake into the sodium bicarbonate solution and stir vigorously to mix, use physical methods to slowly dehydrate the sodium bicarbonate solution so that the sodium bicarbonate is evenly crystallized on the silver carbonate , suction filtered to obtain the coated product filter cake and dried at 60° C. for 24 hours. The dried product was calcined at 660°C for 2h. The calcined product was added into 1000ml of pure water, stirred and washed thoroughly to obtain silver powder, and the silver powder was vacuum-dried...

Embodiment 3

[0042] Add 340g of analytically pure silver nitrate to 1500ml of pure water to dissolve, then add 120g of sodium carbonate to 1000ml of pure water to dissolve, quickly add the silver nitrate solution to the sodium carbonate solution and stir for 10min, react for 20min, let it stand for clarification, and then filter to obtain silver carbonate filter cake.

[0043] Add 414g of analytically pure potassium carbonate to 350ml of water and stir until dissolved. Add the silver carbonate filter cake to the potassium carbonate solution and stir vigorously to mix, use physical methods to remove the water in the potassium carbonate solution so that the potassium carbonate takes silver carbonate as the nucleus and crystallizes on its surface, and the coated product is suction filtered , The obtained filter cake was dried at 120° C. for 24 hours. The dried product was calcined at 750°C for 1.5h. The calcined product was added into 1000ml of pure water, stirred and washed thoroughly to obt...

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Abstract

The invention relates to a preparation method for high-crystallinity silver powder. The preparation method is characterized by comprising the following steps of: firstly, synthesizing a silver carbonate precursor; uniformly coating the silver carbonate precursor by using a coating agent; and performing low-temperature crystal water removing, high-temperature thermal decomposition, densification sintering and washing on the coated silver carbonate precursor to obtain high-crystallinity silver powder. Due to the adoption of the method disclosed by the invention, high-crystallinity silver powder of which the particle diameter is 0.1-5 mu m and the tap density is 3.0-7.0 g / cm<3> can be finally obtained; the silver powder can be used for preparing silver slurry or silver paste for fine threads and high-accuracy printed galvanic circles; the silver powder has the advantages of high dispersity, high crystallinity, superior degree of sphericity, uniform particle size distribution, easiness for dispersing in silver slurry or silver paste and high filling characteristic, so that high-accuracy fine thread printing can be realized; and meanwhile, an obtained silver thick film has low sintering concentration rate and low bulk resistivity.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal processing, in particular to a carbonate or bicarbonate-coated silver carbonate precursor, which is decrystallized at low temperature, decomposed at high temperature, and densified and sintered to obtain spherical silver powder with high crystallinity method of preparation. Background technique [0002] Spherical silver powder is widely used to form thick-film circuits on glass, ceramics, and silicon due to its good filling properties, that is, spherical silver powder is dispersed in organic carriers and printed on substrates, and silver thick-film circuits are formed by low-temperature curing and high-temperature sintering , especially when the formed silver thick-film electrode is in the thin wire condition, the spherical silver powder should have good high temperature shrinkage resistance, that is, the spherical silver powder is required to have high crystallization characteristics. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30
Inventor 施文锋哈敏钟翔鲁东陈学清
Owner 宁夏中色新材料有限公司
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