Silver powder surface modification method, silver soldering paste and preparation method and application of silver soldering paste
A technology of surface modification and silver powder, which is applied in welding equipment, manufacturing tools, welding media, etc., can solve problems such as cracking, sintering quality decline, and sintered silver voids, etc., to achieve a tight interconnection structure, uniform and dense bonding, and bonding good effect
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[0079] Based on the same inventive concept, the embodiments of the present application also provide the above-mentioned preparation method of the silver solder paste, which includes the following steps: after mixing and stirring the surface-modified silver powder and the multi-component organic solvent, the silver solder paste is obtained.
[0080] Based on the same inventive concept, the embodiments of the present application also provide an application of the above-mentioned silver solder paste in chip package interconnection.
[0081] In some embodiments, the chip package interconnection includes a first mother chip, a second mother chip, and a connection layer for connecting the first mother chip and the second mother chip, and the connection layer is made of the above-mentioned silver solder paste through an Press sintering process to sinter to form.
[0082] Specifically, the first mother piece and the second mother piece can be made of copper piece, gold piece, silver p...
Embodiment 1
[0086] The embodiment of the present application provides a method for modifying the surface of silver powder, comprising the following steps:
[0087] S1, place 10g of commercial silver powder (spherical silver powder with a particle size of 60nm) in 120ml of ethanol, vibrate and disperse in an ultrasonic cleaner for 20min and then centrifuge, and obtain wet silver powder after solid-liquid separation; repeat the above steps 3 times;
[0088] S2, mix 0.1 g of n-dodecanethiol, 120 ml of ethanol, and the wet silver powder in step S1, oscillate and disperse in an ultrasonic cleaner for 30 min and then centrifuge, and obtain a surface-coated wet silver powder after solid-liquid separation;
[0089] S3, in step S2, the surface-coated wet silver powder, 6ml of ethanol and 30ml of tert-butanol are mixed, shaken and dispersed in an ultrasonic cleaner for 60min and then placed in a refrigerator for 10h to freeze to obtain a frozen surface-coated silver powder; The surface-coated silv...
Embodiment 2
[0093] The embodiment of the present application provides a method for modifying the surface of silver powder, comprising the following steps:
[0094] S1, place 2g of commercial silver powder (spherical silver powder with a particle size of 50nm) in 30ml of ethanol, vibrate and disperse in an ultrasonic cleaner for 30min and then centrifuge, and obtain wet silver powder after solid-liquid separation; repeat the above steps 3 times;
[0095] S2, mix 0.02g of tert-dodecanethiol, 30ml of ethanol, and the wet silver powder in step S1, oscillate and disperse in an ultrasonic cleaner for 40min and then centrifuge, and obtain a surface-coated wet silver powder after solid-liquid separation;
[0096] S3, in step S2, the surface-coated wet silver powder, 3ml of ethanol and 15ml of tert-butanol are mixed, shaken and dispersed in an ultrasonic cleaner for 40min and then placed in a refrigerator for 12h to freeze to obtain a frozen surface-coated silver powder; The surface-coated silver...
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Abstract
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