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Nano-silver powder, manufacturing method and application thereof

A technology of nano silver powder and manufacturing method, applied in cable/conductor manufacturing, metal/alloy conductors, electrical components, etc., can solve the problems of silver electrode erosion, small electrode coverage, etc., and achieve improved solder resistance, large specific surface area, The effect of improving electrode coverage

Active Publication Date: 2011-09-07
GRIKIN ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrode coverage is small, and the silver electrode is easily eroded by the Sn-Pb solder after dipping in the Sn-Pb solder at 220-230°C (special 305°C) for 1-3s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment one, a kind of nanometer silver powder (1kg), its production technology is as follows:

[0049] 1 Silver Carbonate Preparation

[0050] Take by weighing 1575 grams of analytically pure silver nitrate (silver content 1kg), adjust the molar concentration into a silver nitrate solution of 1.25mol / L with ion-exchanged water in a container, add anhydrous sodium carbonate solution dropwise, adjust the pH value to 9~ 10. Prepare silver carbonate, and use the siphon method to wash the silver carbonate to neutrality through ion-exchange water.

[0051] 2 Preparation of reducing agent mixture

[0052] Hydrazine hydrate is 0.15L according to 0.1~1.2L / 1kg of silver, and 0.12L of 5wt% polyvinyl alcohol aqueous solution (containing 6.5g of polyvinyl alcohol) is measured according to 5~15g / 1kg of silver, and hydrazine hydrate and 5wt% polyvinyl alcohol The solution was stirred and mixed evenly to obtain a reducing agent mixed solution.

[0053] 3 Preparation of nano-silver...

Embodiment 2

[0062] Embodiment two, a kind of nanometer silver powder (1kg), its production technology is as follows:

[0063] 1 Preparation of silver oxide

[0064] Take by weighing 1575 grams of analytically pure silver nitrate (silver content 1kg), adjust the molar concentration into a silver nitrate solution of 2.2mol / L with ion-exchanged water in a container, add sodium hydroxide alkali solution dropwise, adjust the pH value to 9~ 10. Prepare silver oxide, and use siphon method to wash the silver oxide with ion-exchanged water to neutrality.

[0065] 2 Preparation of reducing agent mixture

[0066] Take 1.0L of glycerin at 0.1-1.2L / 1kg of silver, weigh 15g of rosin at 5-20g / 1kg of silver (it can be dissolved in ethanol), stir and mix the glycerin and rosin solutions evenly to obtain a reducing agent mixed solution .

[0067] 3 Preparation of nano-silver powder by chemical reduction method

[0068] In the silver oxide prepared in the step 1 of silver oxide preparation, add the amou...

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Abstract

The invention relates to nano-silver powder used for DC electrode sizing agents and low-temperature bonding nano-silver paste, and a manufacturing method thereof. The physical properties of nano-silver powder are as follows: particle size distribution between 10 and 100 mu, average particle size between 20 and 50 nm, specific surface area between 30 and 50 m2 / g, and apparent density between 1.5and 3.0 g / cm3. The nano-silver powder adopts a chemical reduction method and is prepared by adopting hydrazine hydrate, glycerine or triethanolamine to reduce silver compounds at 90 to 92 DEG C. The nano-silver powder manufactured by the method is applied to the DC electrode sizing agents sintered at 800 DEG C. When the nano-silver powder is applied to the nano-silver paste of SiC or GaN and other chips bonded at 260 to 270 DEG C, electrodes have the advantages of good weldability, high conductivity, stable electrical property, high bonding strength, high reliability and the like.

Description

technical field [0001] The invention relates to a compound with an average particle diameter of 20-50nm and a specific surface area of ​​30-50m 2 / g, bulk density is 1.5~3.0g / cm 3 nano silver powder. The use of the nano-silver powder: 1. The nano-silver powder is used as the silver electrode paste of the disc ceramic capacitor (DC), and the electrode coverage can reach 200cm 2 / g, excellent solderability. 2. The nano-silver powder is used as nano-silver paste for bonding chips at low temperature, bonding SiC or GaN chips to the surface of ceramics, after baking at 260 ° C to 270 ° C, the bonding force is > 20 MPa, and the tensile tension is not less than 40 MPa. Background technique [0002] Porcelain capacitors are a type of electronic components that consume a lot, among which, wafer capacitors (DC) are used the most. Solderable Ag conductor paste has the following characteristics: low metal content, Ag is usually: 52, 55, 60%, and the largest usage is 55% Ag conten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01B13/00H01G4/008
Inventor 陈峤贺昕李治宇陈斐吴松吴聪刘凤茹
Owner GRIKIN ADVANCED MATERIALS
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