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Preparation method of high-tap-density small-granularity sphere-like silver powder for LTCC (low temperature co-fired ceramic) inner electrode

A technology with small particle size and spherical shape, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of wide particle size distribution of silver powder, difficulty in solid-liquid separation process, high content of organic impurities, etc., and achieve low cost and low equipment requirements. High, uniform particle size effect

Pending Publication Date: 2022-07-08
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the liquid phase chemical reduction method is used to prepare silver powder, there are problems that the particle size distribution of silver powder is too wide, the content of organic impurities is high, it is easy to form agglomerated large particles, it is not easy to settle, the process of solid-liquid separation is difficult, and the yield is low.

Method used

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  • Preparation method of high-tap-density small-granularity sphere-like silver powder for LTCC (low temperature co-fired ceramic) inner electrode
  • Preparation method of high-tap-density small-granularity sphere-like silver powder for LTCC (low temperature co-fired ceramic) inner electrode
  • Preparation method of high-tap-density small-granularity sphere-like silver powder for LTCC (low temperature co-fired ceramic) inner electrode

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Effect test

preparation example Construction

[0028] like figure 1 As shown in the figure, a preparation method of high-vibration small-sized spherical silver powder for LTCC inner electrode, comprising the following steps:

[0029] (1) Dissolve silver nitrate in pure water to obtain a silver nitrate solution with a concentration of 250~300g / L, and keep the temperature at 25~30℃.

[0030] (2) Dissolve the reducing agent in pure water to obtain a reducing agent solution with a concentration of 100~180g / L, and keep the temperature at 25~30℃; the reducing agent refers to any one of glucose, hydroquinone and hydrazine hydrate.

[0031] (3) Dissolving the dispersant and particle size control agent in pure water to obtain a bottom liquid solution, the temperature is kept at 25~30℃; the addition amount of the dispersant in the bottom liquid solution is 100~200g / L, and the addition amount of the particle size control agent is 0.27~ 5.0g / L; dispersant refers to one of lactic acid, polyvinylpyrrolidone and gelatin; particle size c...

Embodiment 1

[0036] Embodiment 1 A preparation method of high-vibration small-sized spherical silver powder for LTCC inner electrode, comprising the following steps:

[0037] (1) Dissolve 250 g of silver nitrate in 1 L of pure water to obtain a silver nitrate solution, and keep the temperature at 25 °C.

[0038] (2) Dissolve 180 g of glucose in 1 L of pure water to obtain a reducing agent solution, and keep the temperature at 25 °C.

[0039] (3) Dissolve 200g of polyvinylpyrrolidone and 1.8g of ammonia water in 1L of pure water to obtain a bottom liquid solution, and keep the temperature at 25°C.

[0040] (4) Add the silver nitrate solution and the reducing agent solution to the bottom solution and stir them in parallel. Get silver dust.

[0041] Wherein: the surface modifier solution refers to the solution obtained by dissolving 0.8 g of polyacrylamide in 0.05 L of absolute ethanol. ⑸ Wash the silver powder until the conductivity of the washing liquid is less than or equal to 20μs, the...

Embodiment 2

[0044] Embodiment 2 A preparation method of high-vibration small-sized spherical silver powder for LTCC inner electrode, comprising the following steps:

[0045] (1) Dissolve 250 g of silver nitrate in 1 L of pure water to obtain a silver nitrate solution, and keep the temperature at 30 °C.

[0046] (2) Dissolve 180 g of glucose in 1 L of pure water to obtain a reducing agent solution, and keep the temperature at 30 °C.

[0047] (3) Dissolve 200g of polyvinylpyrrolidone and 1.0g of ammonia water in 1L of pure water to obtain a bottom liquid solution, and the temperature is kept at 30°C.

[0048] (4) Add the silver nitrate solution and the reducing agent solution to the bottom liquid solution in cocurrent flow and stir, the cocurrent addition speed is 100mL / min, the solution addition time is 10min, and the stirring speed is 600rpm. After 20 minutes of reaction, the surface modifier solution was added to obtain silver powder.

[0049] Wherein: the surface modifier solution is ...

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Abstract

The invention relates to a preparation method of high-tap-density small-granularity sphere-like silver powder for an LTCC (Low Temperature Co-Fired Ceramic) inner electrode, which comprises the following steps of: (1) dissolving silver nitrate in pure water to obtain a silver nitrate solution with the concentration of 250-300g / L; (2) dissolving a reducing agent in pure water to obtain a reducing agent solution with the concentration of 100-180g / L; (3) dissolving a dispersing agent and a granularity control agent in pure water to obtain a base solution; (4) the silver nitrate solution and the reducing agent solution are added into the base solution in a parallel flow mode and stirred, a surface modifier solution is added after a reaction is conducted for 15-20 min, and silver powder is obtained; (5) washing the silver powder until the conductivity of the washing liquid is less than or equal to 20 microseconds, and carrying out solid-liquid separation to obtain an Ag powder filter cake; and (6) drying, powdering and screening the Ag powder filter cake to obtain the high-tap-density small-particle-size sphere-like superfine silver powder with the average particle size of 1.0-4.0 microns and the tap density of 6.0-6.5 g / cm < 3 >. According to the method, the reducing agent, the dispersing agent, the particle size control agent and the like in the reduction process are scientifically and reasonably controlled through the liquid phase reduction method, and therefore the superfine silver powder with the small particle size and the high tap density is obtained.

Description

technical field [0001] The invention relates to the technical field of preparation of precious metal materials, in particular to a preparation method of high-vibration small-sized spherical silver powder used for LTCC inner electrodes. Background technique [0002] With the rapid development of electronic industry, new energy and other technical fields, as a functional material with high surface activity and excellent electrical conductivity, ultrafine silver powder is widely used in conductive paste, energy industry, composite materials, catalysts, antibacterial materials and other fields. Among them, conductive paste, as a functional material, is widely used in the production of various electronic components, such as LTCC, chip components, etc. Silver powder is the most important raw material of conductive paste, which has an important influence on parameters such as film formation, film thickness, electrical properties, solderability and adhesion during the preparation p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/065B22F1/102B22F1/05
CPCB22F9/24Y02E60/10
Inventor 范秀娟胡家彦杨凯麟张亚红包飞燕吴来红王维斌王国强王悦高嘉蔚王新辉乔天宇李芯悦任哲峥吴婧石兴旺彭雄罗宁耿格
Owner JINCHUAN GROUP LIMITED
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