Development of a pilot scale process of nano carbon doping technology using glycerin

Many attempts have been made to synthesize MgB2 superconductors with the aim of improving the superconducting properties under high magnetic fields through doping with various forms of carbon such as SiC, carbon (C), hydrocarbon and carbohydrate. One of the most significant characteristics of an MgB2 superconductor is a lack of weak links between grains in contrast to high-critical temperature (Tc) superconductors. In particular, MgB2 superconductors with smaller grain size have high critical properties due to the presence of the grain boundaries that are flux pinning centers. The quality of precursor powders is an important factor influencing the superconducting properties and performance of in situ powder-in-tube (PIT) processed MgB2 wire. In this study, we studied the glycerin treatment of boron powder for carbon doping to MgB2. The glycerin treatment process, which is a unique technique using a liquid source, has been developed by KAERI superconductivity research group. The developed process was transferred to Samdong company through the contract between KAERI and Samdong. This project was aimed of developing a pilot scale process of the glycerin treatment process for the commercialization of the carbon doped MgB2 wires to MRI and other superconducting magnets of electrical applications.