Unlock instant, AI-driven research and patent intelligence for your innovation.

Nano-silver particle and its preparation method, nano-silver paste and welding joint

A technology of nano-silver particles and welded joints, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of low connection strength of welded joints, size control of nano-silver particles, and insufficient decomposition of organic compounds. Molecular dispersants and other issues

Active Publication Date: 2022-06-14
FOSHAN HUAZHI ADVANCED MATERIALS CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, it is difficult to control the size of the nano-silver particles in the preparation process, and the particle size distribution of the obtained nano-silver particles is wide, and it is impossible to flexibly adjust the particle size of the nano-silver particles according to actual production needs
And, in the existing preparation method, in order to prevent the nano-silver particles that reduction obtains from agglomerating, it is usually necessary to add organic polymer dispersants such as PVP (polyvinylpyrrolidone) to the system; the decomposition of these polymer dispersants The temperature is high, therefore, nano-silver paste needs to be sintered at a relatively high temperature for a long time to obtain a high-strength solder joint, but this will cause damage to chips, substrates and other components; if the sintering temperature is too low, then It is not enough to decompose the organic polymer dispersant with a high content in the complete nano-silver paste, and the prepared welded joint has low connection strength

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nano-silver particle and its preparation method, nano-silver paste and welding joint
  • Nano-silver particle and its preparation method, nano-silver paste and welding joint
  • Nano-silver particle and its preparation method, nano-silver paste and welding joint

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] One aspect of the present invention, there is provided a method for preparing silver nanoparticles, comprising the following steps:

[0031] a). The silver salt, organic amines, the first solvent was mixed to give a first solution, the number of carbon atoms in the backbone of the organic amine is less than or equal to 6;

[0032] b). The organic acid, the reducing agent, the second solvent is mixed to give a second solution, the number of carbon atoms in the main chain of the organic acid is less than or equal to 6;

[0033] c). The first and second solutions are mixed, and the ratio of the amount of organic amines to organic acids is controlled to be 1: (0.2 to 5), and the solid-liquid separation is carried out after the reaction is complete.

[0034] In the present invention, steps a) and b) are not prioritized.

[0035] In some embodiments, the silver salt is first dissolved in a first solvent, after the dissolution is completely complete and then added organic amines; ...

Embodiment 1

[0071] Silver nitrate was dissolved in ethylene glycol, and then sonicated at 40 °C for 10 min to make silver nitrate fully soluble; Subsequently, isopropanolamine was added to the silver nitrate- ethylene glycol solution to give the first solution; Among them, the concentration of silver nitrate is 0.2mol / L, and the concentration of isopropanolamine is 8mol / L;

[0072] Α-hydroxypropionic acid was dissolved in ethylene glycol, and then sodium borohydride was added to the α-hydroxypropionic acid-ethylene glycol solution to give a second solution; Among them, the concentration of α-hydroxypropionic acid is 4mol / L, and the concentration of sodium borohydride is 0.06mol / L;

[0073] Take the first solution and the second solution mixed, and such that the ratio of the amount of isopropanolamine to the substance of α - hydroxypropionic acid is 1: 0.5, continuously stirred until the reaction is complete;

[0074] The above reaction system is completely placed into a centrifuge tube for ce...

Embodiment 2

[0076] Silver nitrate was dissolved in ethylene glycol, and then sonicated at 40 °C for 10 min to make silver nitrate fully soluble; Subsequently, isopropanolamine was added to the silver nitrate- ethylene glycol solution to give the first solution; Among them, the concentration of silver nitrate is 0.2mol / L, and the concentration of isopropanolamine is 8mol / L;

[0077] Α-hydroxypropionic acid was dissolved in ethylene glycol, and then sodium borohydride was added to the α-hydroxypropionic acid-ethylene glycol solution to give a second solution; Among them, the concentration of α-hydroxypropionic acid is 4mol / L, and the concentration of sodium borohydride is 0.02mol / L;

[0078] Take the first solution and the second solution mixed, and such that the ratio of the amount of isopropanolamine to the substance of α - hydroxypropionic acid is 1:2, continuously stirred until the reaction is complete;

[0079] The above reaction system is completely placed into a centrifuge tube for centr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
viscosityaaaaaaaaaa
shear strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of new materials, in particular to a nano-silver particle and a preparation method thereof, a nano-silver paste and a welding joint. The present invention introduces small molecular organic amines and organic acids in the process of preparing nano-silver particles, and sets the ratio of the amount of the two substances to 1: (0.2-5), so that the speed of the reaction of the two can be controlled, thereby Realize the control of the size of the final silver nano-particles; in addition, the amide formed by the reaction of amine and acid can also be used as a dispersant to avoid the agglomeration of silver nano-particles, so there is no need to introduce additional organic polymers such as PVP into the system to disperse agent. Since the small molecule amide can be rapidly decomposed to generate volatile acids and amines at about 230°C, the nano-silver particles prepared in the present invention can effectively reduce the porosity of the sintered body when sintered after being made into nano-silver paste , to achieve higher connection strength.

Description

Technical field [0001] The present invention relates to the field of new material technology, in particular to a nano silver particle and a preparation method thereof, a nano silver paste and a welding joint. Background [0002] With the large-scale application of high-power semiconductor materials such as GaN and SiC, the working temperature of the chip is getting higher and higher, and the traditional soft brazing materials such as Sn-based materials have low reliability at high temperatures, and even remelting occurs. The electronic paste such as nano-silver paste can realize sintered connection at low temperature, and there is no remelting phenomenon in service at high temperature, which has the advantages of high thermal conductivity, high conductivity and high reliability, and has been widely used in the field of microelectronic interconnection. [0003] The nano silver paste preparation method usually consists of two main steps: 1) adding a reducing agent to reduce the sil...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/054B22F3/10B22F9/24B82Y30/00B82Y40/00
CPCB22F9/24B22F3/10B82Y30/00B82Y40/00
Inventor 王郑张浩马文珍
Owner FOSHAN HUAZHI ADVANCED MATERIALS CO LTD