US 12,090,556 B2
Method for producing silver powder with adjustable shrinkage
Jae Won Choi, Busan (KR); Chang Gun Lee, Ulsan (KR); Mi Young Lee, Busan (KR); Woo Min Jin, Ulsan (KR); Tae Hoon Kang, Ulsan (KR); and Young Hwan Kim, Gumi (KR)
Assigned to LS MNM INC., Ulsan (KR)
Appl. No. 17/298,437
Filed by LS-NIKKO COPPER INC., Ulsan (KR)
PCT Filed Nov. 29, 2019, PCT No. PCT/KR2019/016807
§ 371(c)(1), (2) Date May 28, 2021,
PCT Pub. No. WO2020/111903, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 10-2018-0153123 (KR), filed on Nov. 30, 2018.
Prior Publication US 2022/0023947 A1, Jan. 27, 2022
Int. Cl. B22F 9/24 (2006.01); H01B 1/02 (2006.01); H01B 1/16 (2006.01)
CPC B22F 9/24 (2013.01) [H01B 1/02 (2013.01); H01B 1/16 (2013.01); B22F 2203/11 (2013.01); B22F 2301/255 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A silver powder preparation method comprising a silver salt reduction step comprising:
a reaction solution preparation step of preparing a first reaction solution containing silver ions, ammonia, an alkali metal salt of an organic acid, and a phosphorous compound, and a second reaction solution containing a reducing agent; and
a precipitation step of allowing reaction between the first reaction solution and the second reaction solutions to obtain silver particles to prepare the silver powder,
wherein the content of the phosphorous compound and a reaction temperature for the precipitation step are adjusted to control a shrinkage rate of the silver powder to a range from 5% to 20% at 500° C.,
wherein in the reaction solution preparation step, the phosphorous compound is added in a ratio of 0.02% to 0.06% by weight with respect to the total weight of the first reaction solution, and
wherein in the precipitation step, the reaction temperature is adjusted to be in a range of 15° C. to 35° ° C.