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
CN102441675BActive Publication Date: 2014-06-18宁夏中色新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
宁夏中色新材料有限公司
Publication Date
2014-06-18

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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.
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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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