Low-temperature sintered highly-heat-conductive and highly-electric-conductive silver paste, preparation method and sintering method
A technology of low-temperature sintering and high thermal conductivity, which is applied in the direction of cable/conductor manufacturing, conductive layer on insulating carrier, conductive material dispersed in non-conductive inorganic materials, etc., and can solve high and insufficient sintering temperature, easy agglomeration of nano-silver powder, etc. Problems, to achieve the effect of high electrical conductivity and thermal conductivity, low sintering temperature, high thermal conductivity and electrical conductivity
Active Publication Date: 2012-10-03
诺特达新材料科技(上海)有限公司
View PDF4 Cites 15 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The method adopts nano-silver solder paste prepared by uniformly mixing nano-silver particles with a particle size of less than 100nm, dispersant fish oil, binder α-terpineol and solvent acetone with the assistance of an ultrasonic water bath, and sintering at low temperature to package and connect high-power light-emitting diodes. , the advantage is that it improves the shortage of LED packaging materials in terms of electrical conductivity, thermal conductivity, bonding strength, and high temperature resistance. However, the disadvantages are also obvious. The silver glue of this patent must be heated to 290°C to complete the sintering. The sintering temperature On the high side, it cannot be used in situations where lower temperature operation is required
In addition, the nano-silver powder used in the silver paste itself is easy to agglomerate, although a dispersant is used, the effect is still not good
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] The present invention will be described in detail below in conjunction with the examples. Examples are only preferred implementations of the present invention, not limitations of the present invention.
[0027] Using AgNO 3 Chelate with oxalic acid to form oxalic acid chelated silver as a silver source, then disperse it in isopropanol and triethanolamine, add a small amount of tin powder and grind to form a slurry.
[0028] The specific preparation method is:
[0029] (1) Take 30g of AgNO 3 and 10g of (COOH) 2 Dissolve in 100ml of water respectively, then use a mixer to stir at a high speed of 2500rpm (COOH) 2 aqueous solution, while adding AgNO dropwise 3 aqueous solution, the system rapidly forms Ag 2 (COOH) 2 precipitation.
[0030] Specifically, AgNO 3 React with oxalic acid according to the following formula:
[0031] 2AgNO 3 +(COOH) 2 ——→ Ag 2 (COOH) 2 + 2 HNO 3
[0032] (2) After the dropwise addition, the system was refrigerated in a refrigerato...
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
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a low-temperature sintered highly-heat-conductive and highly-electric-conductive silver paste for connecting a high-power LED and a solar battery, and further relates to a highly-heat-conductive and highly-electric-conductive silver paste preparation method and using method. The highly-heat-conductive and highly-electric-conductive silver paste takes a mixed solution of isopropyl alcohol and triethanolamine as a solvent, adopts Ag2(COOH)2 as a silver source, and contains nano tin powder. The preparation method comprises the following steps: a univalent silver ion solution is added into an oxalic acid water solution being stirred at high speed, an Ag2(COOH)2 quickly deposit in the system, the deposit is filtered, cleaned and dried after being refrigerated; the Ag2(COOH)2 is resolved by the mixed solution of isopropyl alcohol and triethanolamine; the nano tin powder is added; and the system obtained in the above step is added into a ball milling tank and ball-milled for 2-4 hours, so as to obtain the highly-heat-conductive and highly-electric-conductive silver paste. According to the invention, a silver complex instead of silver powder is taken as the silver source, a dispersant is not required, the operation temperature is extremely low and the electrical conductivity and the heat conductivity are very high.
Description
technical field [0001] The invention relates to a silver paste used for connecting high-power LEDs and solar cells, and also relates to a preparation method and a sintering method of the silver paste. Background technique [0002] The silver paste used for electrical interconnection or circuit formation in the market generally adopts epoxy resin system or oxide system. The epoxy resin system is to add silver powder to epoxy resin and curing agent. The oxide system is oxidized at several low melting points. Nano-scale silver powder is added to the product, the former is solidified at not lower than 100°C to form a product, and the latter needs to be sintered at a high temperature. [0003] The silver paste of the epoxy resin system is cured and the silver powder is connected together by the epoxy resin. The advantage is that the operating temperature is low, and the disadvantage is that the thermal conductivity and electrical conductivity are very low and cannot be used in hi...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01B5/14
Inventor 胡延超陈彬
Owner 诺特达新材料科技(上海)有限公司