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Method for preparing monodisperse silver-palladium composite microsphere

A composite microsphere and monodisperse technology, which is applied in the field of synthesis of monodisperse silver-palladium composite microspheres, can solve the problem of high cost and achieve the effects of low cost, easy cleaning and high yield

Active Publication Date: 2013-07-17
SINO PLATINUM METALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to existing reports, the preparation of silver-palladium alloys is mostly concentrated at the nanometer level (below 20nm), and there are relatively few reports on the preparation of submicron-level powders. Use organic acid as reducing agent, the cost is higher

Method used

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  • Method for preparing monodisperse silver-palladium composite microsphere
  • Method for preparing monodisperse silver-palladium composite microsphere
  • Method for preparing monodisperse silver-palladium composite microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add silver nitrate containing 4.5g silver, palladium nitrate containing 0.5g palladium, 2mg gelatin and 25mL deionized water into a 150mL beaker in turn. into a separatory funnel; hydrazine hydrate with 10 times the molar number of silver palladium was added to 75 mL of deionized water and stirred evenly as a reducing solution; at 15° C., the raw material solution was added dropwise to the reducing solution, and reacted at this temperature for 5 minutes. The XRD diffraction peaks of the sample are as figure 1 As shown in , the peak shape is similar to the standard peak of cubic phase elemental silver (JCPDS No. 04-0783), but the peak position is slightly shifted to high angle, and the peak of elemental palladium basically does not appear, indicating that the product under this condition is The composite structure of the alloy; the morphology is as figure 2 shown. It can be seen that the product is a well-dispersed spherical powder with a size of about 750nm and unifo...

Embodiment 2

[0023] Add silver nitrate containing 4.5g of silver, palladium nitrate containing 0.5g of palladium, 8mg of gelatin and 25mL of deionized water into a 150mL beaker in sequence. into a separatory funnel; hydrazine hydrate with 2 times the molar number of silver palladium was added to 75mL deionized water and stirred evenly as a reducing solution; at 45°C, the raw material solution was added dropwise to the reducing solution, and reacted at this temperature for 30min. looks like image 3 shown. It can be seen that the product is a well-dispersed spherical powder with a size of about 350 nm and uniform distribution.

Embodiment 3

[0025] Add silver nitrate containing 4.5g of silver, palladium nitrate containing 0.5g of palladium, 0.5mg of gelatin and 25mL of deionized water into a 150mL beaker in sequence, after completely dissolving, add alkali solution under stirring, adjust the pH of the solution to 9, and transfer into a separatory funnel; hydrazine hydrate with 5 times the molar number of silver palladium was added to 75mL deionized water and stirred evenly as a reducing solution; at 30°C, the raw material solution was added dropwise to the reducing solution, and reacted at this temperature for 15min. The product looks like Figure 4 shown. It can be seen that the product is a well-dispersed spherical powder with a size of about 550 nm.

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Abstract

The invention discloses a method for preparing a monodisperse silver-palladium composite microsphere. The method includes the steps: sequentially adding a certain amount of silver nitrate and palladium nitrate, a certain quantity of surfactants and deionized water into a beaker, and adding a certain amount of alkali adjusting solution with alkaline pH (potential of hydrogen) into the beaker in a stirring manner after fully dissolving the silver nitrate, the palladium nitrate, the surfactants and the deionized water to obtain a silver-palladium mixed system serving as feed solution; adding a certain amount of hydrazine hydrate into the deionized water and uniformly stirring the hydrazine hydrate and the deionized water to serve as reducing solution; and dripping the feed solution into the reducing solution and reacting for 5-30min. The monodisperse silver-palladium composite microsphere is synthesized by a common liquid phase reduction method. Compared with other methods, the method has the advantages of simplicity, low cost, high yield, easiness in cleaning and the like. The silver-palladium composite microsphere prepared by the method is uniform, fine in dispersity and controllable in grain diameter.

Description

technical field [0001] The invention belongs to noble metal composite powder materials, in particular to a method for synthesizing monodisperse silver-palladium composite microspheres. Background technique [0002] With its excellent sintering resistance, solderability, migration resistance and moderate price, silver palladium paste is widely used in hybrid integrated circuits as interconnection conductive strips and soldering areas of circuits, and is widely used in chip resistors, MLCC capacitors, chip inductors and other externally mounted components as electrodes, etc. In recent years, with the rapid development of aerospace, communication technology and artificial intelligence technology, the requirements for multi-function, high reliability and high integration of electronic components have become increasingly fierce, and the thickness of the conductive film is required to be less than 10 um. The line width and line spacing of the circuit are required to be narrower, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 陈立桥熊庆丰陈家林孙旭东霍地吴玲
Owner SINO PLATINUM METALS CO LTD
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