Beijing Institute of Technology

Xingwang Cheng

Hao Zhang

Ying Liu

Chao Zhang

Hongmei Zhang

Hongnian Cai

Dezhen Yang

Zhiping Xiong

Yuxin Ge

Qunbo Fan

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%.

Carbide-free tempered martensitic steels and preparation methods thereof

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.

Method for forming nickel plated graphene hollow sphere

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Beijing, China

Xingwang Cheng