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Magnesium diboride with superconductivity

Is magnesium diboride powder a superconductor?
Superconductors, as the name suggests, are conductors that do not dissipate energy after passing current. After the Dutch scientist Onnes discovered the superconductivity of mercury in 1911, people only increased the transition temperature to 23K (about minus zero) in the following seventy years. 250℃). In early March 2001, Japanese scientists reported that the binary material magnesium diboride (MgB2) exhibited superconducting properties at around 39K.
Particle size and purity of magnesium diboride
Magnesium diboride is an ionic compound having a hexagonal crystal structure. It is an intercalation compound with alternating layers of magnesium and boron. Purity> 99%; particle size: 5-10um

Application of Magnesium Diboride Powder
Potential applications of magnesium diboride include superconducting magnets, power transmission lines and sensitive magnetic field detectors.
Magnesium diboride is the focus of new materials. The research focuses on the properties of synthesis and superconducting elements for industrial synthesis and sintering properties, electrical conductivity at room temperature and the corrosion resistance of aluminum fluoride to liquid aluminum. There are few studies on corrosion, so MgB2 and its composite materials will never appear in the coverage of the aluminum electrolytic cathode area.
MgB2 is easier to sinter and densify than TiB2, and its electrical conductivity basically meets the requirements of aluminum electrolytic cathodes. Therefore, MgB 2 and its composite materials are likely to be widely used as cathode materials for aluminum electrolysis.
Propellants, explosives, pyrotechnics: Unlike boron, boron does not burn completely through the glass oxide layer that prevents the diffusion of oxides, while magnesium diboride burns completely in oxygen or oxidant mixtures. Therefore, magnesium boride is proposed as a fuel for ramjet engines. In addition, for the same reason, it has been proposed to use MgB2 in enhanced explosives and propellants.

How to produce superconducting magnesium diboride wire
It can be produced by the sintering method in powder tube. This method can be divided into two processes: in-situ and ex-situ. In the in-situ method, the traditional wire drawing method is used to produce boron-magnesium alloy filaments, and then the alloy wires are heated to the reaction temperature to generate MgB2. In the ex-situ method, the sintered tube is filled with MgB2 powder (usually silver or 316 stainless steel is used to increase the ductility of magnesium diboride), which is sintered at 800 to 1000 ℃ after drawing. No matter which method is used, heat treatment at 950 ℃ after sintering can further improve the superconductivity of the magnesium diboride wire.
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