US 12,448,556 B2
Method of producing composite material
Shoichi Yamada, Anan (JP); and Takeshi Kihara, Tokushima (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Appl. No. 17/796,033
Filed by NICHIA CORPORATION, Anan (JP)
PCT Filed Jan. 25, 2021, PCT No. PCT/JP2021/002456
§ 371(c)(1), (2) Date Jul. 28, 2022,
PCT Pub. No. WO2021/153506, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020-015338 (JP), filed on Jan. 31, 2020.
Prior Publication US 2023/0086662 A1, Mar. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B22F 1/05 (2022.01); B22F 3/105 (2006.01); B22F 3/14 (2006.01); C09K 5/14 (2006.01)
CPC C09K 5/14 (2013.01) [B22F 1/05 (2022.01); B22F 3/105 (2013.01); B22F 3/14 (2013.01); B22F 2003/1051 (2013.01); B22F 2301/10 (2013.01); B22F 2302/406 (2013.01); B22F 2304/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of producing a composite material, the method comprising:
preparing a mixed powder of diamond particles and copper powder particles; and
generating a composite material containing diamond and copper from the mixed powder by pulsed electric current sintering with repeated application of a first pressure and a second pressure higher than the first pressure, each of the first pressure and the second pressure being 5 MPa or greater and 100 MPa or less applied to the mixed powder, and with the mixed powder maintained at a temperature equal to or higher than 500° C. and lower than 800° C.