公开(公告)号：US20250043377A1

公开(公告)日：2025-02-06

申请号：US18401294

申请日：2023-12-29

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Zhiping XIONG ,  Dezhen YANG ,  Chao ZHANG ,  Hao ZHANG ,  Xingwang CHENG

IPC: C21D9/46 ,  C21D1/18 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/38

Abstract: The embodiments of the present disclosure provide a carbide-free tempered martensitic steel and a preparation method thereof. The carbide-free tempered martensitic steel includes a martensite matrix without carbide and a retained austenite distributed between the martensite matrix obtained after tempering or partitioning. A size of retained austenite is submicron or nanoscale, a morphology of retained austenite includes at least one of sphere, block, or film, and a volume fraction of the retained austenite is in a range of 10%-40%.

公开(公告)号：US20210222302A1

公开(公告)日：2021-07-22

申请号：US17147947

申请日：2021-01-13

Applicant: Beijing Institute of Technology

Inventor： Hongmei ZHANG ,  Yuxin GE ,  Hongnian CAI ,  Xingwang CHENG ,  Ying LIU ,  Qunbo FAN

IPC: C23C18/36 ,  C23C18/16

Abstract: A method for forming a nickel plated graphene hollow sphere is based on self assembly of graphene under the actions of a rotation force and the van der Waals force, and an electroless nickel plating process performed on the exposed surface of the graphene by means of a hydrothermal method. The method is simple to implement at low cost, and the nickel plated graphene hollow sphere product can be produced with good reproducibility and a high yield. The nickel plated graphene hollow sphere formed by the present method can exhibit good electromagnetic wave absorbing performances of both nickel and graphene, and may have a lower overall density.