High-tap density micro aluminum powder and method for producing the same

A technology of tap density and fine silver powder, which is applied in the field of high tap density fine silver powder and its production, can solve the problems of broken metal wire, large shrinkage of silver wire, and small tap density of silver powder, etc., and achieves good matching effect

Inactive Publication Date: 2009-06-24
贵阳晶华电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These inventions all pay attention to the particle size of the silver powder, but they do not pay attention to the tap density of the silver powder; however, if the tap density of the silver powder is small, the shrinkage of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 First, add 10 mL of concentrated ammonia water to 200 mL of silver nitrate solution containing 23.6 g of silver nitrate, stir evenly, and set aside. Next, 1.0 g of sodium dodecylsulfonate and 0.2 g of polyvinylpyrrolidone K were added to 400 mL of reducing agent solution containing 20 g of hydrazine hydrate 30 , stir to dissolve, set aside. Add the above-mentioned silver nitrate solution into the above-mentioned reducing agent solution within 30 minutes while stirring, and the silver particles can be reduced. Afterwards, the reaction solution was filtered off, and the silver particles were washed with deionized water. After the washed silver powder is sucked and dried, it is put into the treatment agent solution for treatment for 60 minutes. Suction and filter the treatment liquid, dry the silver powder in a vacuum oven, and pulverize the dried silver powder.

Embodiment 2

[0020] Embodiment 2 At first, add 10mL concentrated ammonia water to the 200mL silver nitrate solution that contains 23.6g silver nitrate, stir evenly, set aside; Add 2.0g sodium hydroxide and 2g Tween 80 in the 400mL reducing agent solution that contains 24g ascorbic acid, stir to make It dissolves. The silver nitrate solution is added to the reducing agent solution within 50 minutes, and the silver particles can be reduced. The reaction solution was filtered off, and the silver particles were washed with deionized water. After the washed silver powder is sucked and dried, it is put into the treatment agent solution for treatment for 60 minutes; the treatment solution is filtered off, the silver powder is dried in a vacuum oven, and the dried silver powder can be pulverized.

[0021] The particle diameter of the silver powder prepared in the above examples is measured under an electron microscope, and it can be seen that the diameter of the silver particles is mostly between...

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Abstract

The invention discloses minute silver powder with high tap density and a method for producing the same. The silver powder has the following properties: the average particle diameter of the silver powder is between 0.3 and 1.5 mu m; the tap density of the silver powder is not less than 4.5g/cm<3>; and the contraction rate of the silver powder is less than or equal to 19 percent after the silver powder is sintered at the temperature of less than or equal to 900 DEG C. The production method comprises: (1) preparing a solution containing silver ions for standby; (2) preparing a reducer aqueous solution containing a dispersant for standby; (3) preparing a treatment solution containing a treating agent for standby; (4) mixing and reacting the solution containing the silver ions and the reducer solution containing the dispersant for reducing the silver ions to silver particles; (5) filtering out a reaction solution, and cleaning the silver particles by deionized water; (6) pumping and leaching the cleaned silver powder, putting the cleaned silver powder into the treatment solution for treatment; and subsequently, filtering out the treatment solution; and (7) drying the silver powder in a vacuum oven; and pulverizing the dried silver powder to obtain the minute silver powder with high tap density. Silver slurry prepared from the silver powder is printed on a magnet body or a substrate, is sintered at temperature of less than or equal to 900 DEG C and has good matching property with the magnet body or the substrate. The minute silver powder is suitable for a manufacturer for producing an electronic element.

Description

technical field [0001] The present invention is related to the processing and property improvement of metal powder, in particular, it relates to high tap density fine silver powder and its production method. technical background [0002] Chip electronic devices, such as resistors, capacitors, inductors, printed circuit boards, mostly use metal paste to form a certain pattern by printing, dip coating, etc., and then form a conductor after sintering. Conventional metal paste contains metal powder, organic solvent, polymer resin, inorganic oxide, dispersant, glass and other components. The traditional production method of silver powder used in the preparation of slurry is mostly chemical reduction method. However, the traditional chemical reduction method is not easy to produce particle size <1.5μm, tap density not less than 4.5g / cm 3 of silver powder. However, with the miniaturization of electronic products, electronic components are required to be smaller and smaller, a...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24
Inventor 陈迪勇
Owner 贵阳晶华电子材料有限公司
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