US 11,866,813 B2
Spray coating
Hayato Hirayama, Kanagawa (JP); Tsuyoshi Higuchi, Kanagawa (JP); Yoshito Utsumi, Kanagawa (JP); and Hiroaki Hoshikawa, Kanagawa (JP)
Assigned to NISSAN MOTOR CO., LTD., Yokohama (JP)
Appl. No. 17/628,350
Filed by NISSAN MOTOR CO., LTD., Yokohama (JP)
PCT Filed Mar. 23, 2021, PCT No. PCT/JP2021/011915
§ 371(c)(1), (2) Date Jan. 19, 2022,
PCT Pub. No. WO2021/205864, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2020-070339 (JP), filed on Apr. 9, 2020.
Prior Publication US 2022/0282361 A1, Sep. 8, 2022
Int. Cl. C22C 38/44 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); B32B 15/01 (2006.01); C23C 4/131 (2016.01); C23C 4/10 (2016.01)
CPC C22C 38/44 (2013.01) [B32B 15/012 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C23C 4/10 (2013.01); C23C 4/131 (2016.01)] 10 Claims
OG exemplary drawing
 
1. A cylinder block comprising:
a cylinder bore having an inner peripheral surface; and
a spray coating disposed on the inner peripheral surface of the cylinder bore; wherein:
the cylinder block is made of aluminum or an aluminum alloy;
the spray coating contains:
0.005% to 0.07% by mass of carbon,
0.01% to 3.0% by mass of nickel,
10% to 15.5% by mass of chromium,
0.05% to 1.5% by mass of silicon, and
a balance containing iron and inevitable impurities;
the spray coating has a composition that forms a martensite+ferrite region in a Schaeffler diagram, and in which a nickel equivalent (NiE) and a chromium equivalent (CrE) in the Schaeffler diagram satisfy a relationship expressed by the following Formulae (1) to (3)
NiE≤0.95CrE−8.59  (1),
NiE≤4.1  (2), and
CrE≥10  (3);
the spray coating has a two-phase structure formed of a martensite phase and a ferrite phase; and
the spray coating has a surface porosity of 2.7% or less.