公开(公告)号：US20240392422A1

公开(公告)日：2024-11-28

申请号：US18232456

申请日：2023-08-10

Applicant: HYUNDAI MOTOR COMPANY ,  KIA CORPORATION ,  KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Dong Hwi Kim ,  Soon Woo Kwon ,  Sang Jae Yoon ,  Min Woo Kang ,  Chung An Lee ,  Seung Hyun Hong ,  Hyun Ki Kim ,  Dong Ik Kim ,  Jae Hyeok Shim ,  Woo Sang Jung ,  Dong Jun Choi

IPC: C22C38/44 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C8/18 ,  C23C8/26 ,  C23C28/04

Abstract: A bearing steel has improved insulation performance by forming a continuous insulating film. The bearing steel includes 0.65 to 1.0 mass % of carbon (C), 1.6 to 2.0 mass % of chromium (Cr), 1.5 to 3.0 mass % of aluminum (Al), 0.8 to 1.2 mass % of manganese (Mn), 0.7 to 1.0 mass % of silicon (Si), 0.1 to 0.3 mass % of nickel (Ni), 0.08 to 0.12 mass % of molybdenum (Mo), and a balance of iron (Fe), in which an oxynitride layer including a nitride layer and an oxide layer is formed on the surface of a material.

公开(公告)号：US10689736B2

公开(公告)日：2020-06-23

申请号：US15139231

申请日：2016-04-26

Applicant: HYUNDAI MOTOR COMPANY ,  HYUNDAI STEEL COMPANY ,  Korea Institute of Science and Technology

Inventor： Sung Chul Cha ,  Bong Lae Jo ,  Sang Min Song ,  Jae Hyeok Shim

IPC: C22C37/00 ,  C22C38/54 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  F01L1/46 ,  C21D9/02 ,  F16F1/02

Abstract: An ultra-high-strength spring steel for an engine valve spring steel comprises, by weight: 0.5-0.7% of carbon (C), 1.3-2.3% of silicon (Si), 0.6-1.2% of manganese (Mn), 0.6-1.2% of chrome (Cr), 0.1-0.5% of molybdenum (Mo), 0.05-0.8% of nickel (Ni), 0.05-0.5% of vanadium (V), 0.05-0.5% of niobium (Nb), 0.05-0.3% of titanium (Ti), 0.001-0.01% of boron (B), 0.01-0.52% of tungsten (W), 0.3% or less (0% exclusive) of copper (Cu), 0.3% or less (0% exclusive) of aluminum (Al), 0.03% or less (0% exclusive) of nitrogen (N), 0.003% or less (0% exclusive) of oxygen (O), and a remainder of Fe and other inevitable impurities, based on 100% by weight of the ultra-high-strength spring steel.

公开(公告)号：US10793476B2

公开(公告)日：2020-10-06

申请号：US16198878

申请日：2018-11-23

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Jae Hyeok Shim ,  Tae Jun Ha ,  Jin Yoo Suh

IPC: C04B35/00 ,  C04B35/58 ,  C04B35/626 ,  C01F17/00

Abstract: A method of preparing cerium boride powder, according to the present invention, includes a first step for generating mixed powder by mixing at least one selected from among cerium chloride (CeCl3) powder and cerium oxide (CeO2) powder, at least one selected from among magnesium hydride (MgH2) powder and magnesium (Mg) powder, and boron oxide (B2O3) powder, a second step for generating composite powder including cerium boride (CexBy) and at least one selected from among magnesium oxide (MgO) and magnesium chloride (MgCl2), by causing reaction in the mixed powder at room temperature based on a ball milling process, and a third step for selectively depositing cerium boride powder by dispersing the composite powder in a solution.