Korea Atomic Energy Research Institute

Korea Hydro Nuclear Power Co., Ltd.

Jaewon Park

Jonghwa Chang

Byungho Choi

Jaehyung Lee

Wonjae Lee

Minhwan Kim

Youngwan Kim

Chang-Kue Park

Sungdeok Hong

Changwon Sohn

Yongwan Kim

The present invention relates to a ceramic coating and ion beam mixing apparatus for improving corrosion resistance, and a method of reforming an interface between a coating material and a base material. In samples fabricated using the coating and ion beam mixing apparatus, adhesiveness is improved, and the base material is reinforced, thereby improving resistance to thermal stress at high temperatures and high-temperature corrosion resistance of a material to be used in a sulfuric acid decomposition apparatus for producing hydrogen.

Coating and ion beam mixing apparatus and method to enhance the corrosion resistance of the materials at the elevated temperature using the same

A high-temperature and high-pressure corrosion-resistant process heat exchanger for a nuclear hydrogen production system decomposes sulfite (SO) using heat from a high-temperature gas-cooled reactor to thereby produce sulfide (SO) and oxygen (O). The process heat exchanger comprises second and third system coolant channels, each of which is defined by a heat transmission fin, which is bent in a quadrilateral shape, and heat transmission plates, and has increased corrosion resistance thanks to ion-beam coating and ion-beam mixing using a material having high corrosion resistance. The third system coolant channel includes reaction catalysts for SOdecomposition, and is made of a super alloy. Thus, a system differential pressure between the second and third system coolant channels can be greatly maintained at a high temperature of 900&#xb0; C. or higher.

High temperature and high pressure corrosion resistant process heat exchanger for a nuclear hydrogen production system

The present invention relates to a manufacturing method of colored diamond and, more particularly, to a manufacturing method of colored diamond by ion implantation and heat treatment. The manufacturing method comprises a first step of implanting ions to the surface of diamond by accelerating the ions under vacuum, and a second step of heat-treating the implanted diamond. By implanting ions inducing the change in the optical band gap of a diamond, the manufacturing method provides a colored diamond with relatively lower cost compared to a metal ion implantation in the prior art, and a uniform color is obtained by heat treatment. Additionally, the manufacturing method of the present invention provides a diamond having various colors with permanent color development effects, by controlling the condition of ion implantation and heat treatment.

Manufacturing method of colored diamond by ion implantation and heat treatment

Growing community of inventors

Daejeon, South Korea

Jaewon Park