US 12,257,622 B2
Joining material, production method for joining material, and joined body
Jinting Jiu, Tokyo (JP)
Assigned to SENJU METAL INDUSTRY CO., LTD., Tokyo (JP)
Appl. No. 17/642,901
Filed by SENJU METAL INDUSTRY CO., LTD., Tokyo (JP)
PCT Filed Oct. 14, 2020, PCT No. PCT/JP2020/038781
§ 371(c)(1), (2) Date Mar. 14, 2022,
PCT Pub. No. WO2021/075463, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 2019-188913 (JP), filed on Oct. 15, 2019.
Prior Publication US 2022/0347745 A1, Nov. 3, 2022
Int. Cl. B22F 1/052 (2022.01); B22F 1/00 (2022.01); B22F 1/0545 (2022.01); B22F 1/06 (2022.01); B22F 1/065 (2022.01); B22F 1/068 (2022.01); B22F 1/107 (2022.01); B22F 3/11 (2006.01); B22F 7/00 (2006.01); B22F 7/04 (2006.01); B23K 35/30 (2006.01); H01L 23/00 (2006.01)
CPC B22F 1/052 (2022.01) [B22F 1/00 (2013.01); B22F 1/0545 (2022.01); B22F 1/06 (2022.01); B22F 1/107 (2022.01); B22F 3/11 (2013.01); B22F 7/002 (2013.01); B22F 7/008 (2013.01); B22F 7/04 (2013.01); B23K 35/3006 (2013.01); H01L 24/27 (2013.01); H01L 24/29 (2013.01); B22F 1/065 (2022.01); B22F 1/068 (2022.01); B22F 2007/042 (2013.01); B22F 2301/10 (2013.01); B22F 2301/15 (2013.01); B22F 2301/255 (2013.01); B22F 2301/30 (2013.01); H01L 2224/271 (2013.01); H01L 2224/29139 (2013.01); H01L 2224/29339 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A joining material comprising:
a sintered body consisting of a sintered product of silver powder containing a first silver particle group and a second silver particle group having different average particle diameters,
wherein an average particle diameter of the first silver particle group is 50 nm or more and less than 1000 nm, and an average particle diameter of the second silver particle group is 1 μm or more and less than 20 μm,
wherein a porosity of the sintered body is 8% to 30%, the porosity of the sintered body is measured by
first immersing the sintered body in water to measure a volume of the sintered body, and
second measuring a mass of the sintered body;
wherein the volume in a case where the sintered body does not have pores corresponding to the mass thereof is calculated based on a theoretical density; and
wherein the porosity of the sintered body is calculated from the measured volume and the theoretical volume in a case where there are no pores, and
a surface roughness Ra of a joining surface is 1.06 μm or more and 3.3 μm or less.