High cost performance Fe-b alloy particle FeB 95:5wt High-Entropy Alloys(HEA) Manufacturing

Boron has an atomic weight of 10.81. The electronic structure is 1s2s2p. The density of crystalline boron is 2.31g/cm(20 ° C), while the density of amorphous boron is 2.30g/cm(20 ° C). Melting point 2079℃, boiling point 3660℃. The equilibrium phase diagram of the boron-iron binary system is shown in Figure 1. In the boroferric system, there is a eutectic point at about 3.8% boron content, and the eutectic temperature is 1149℃. Iron and boron form two intermediate compounds, Fe2B and FeB, which are also extremely stable at high temperatures. FeB has two crystal types: high temperature and low temperature. Industrial production of iron boride (10%~20%B) melting temperature range of 1400~1550℃, the density of 5.8~6.5g/cm

A trace amount of boron (0.001%) can double the hardenability of steel. The addition of about 0.003%B to stainless steel can improve its processability. Boron has the properties of absorbing neutrons, which can hinder or stop the chain reaction of uranium-graphite nuclear reactions. Therefore, steel with higher boron content (>1%B) is used in the atomic energy industry. Boron in cast iron can affect graphitization, thus increasing the depth of the mouth. When the amount of boron added is more than 0.01%, the effect of stabilizing carbide is obvious, so the wear resistance of cast iron is improved. Iron rolling, boron content 0.02%~0.1%, can improve the surface hardness and improve the white solidification. Adding Borda 0.001%~0.005% to malleable cast iron is conducive to forming spheroidal ink. At the same time, it can also increase the particles of graphite and improve its distribution. This effect is conducive to annealing treatment. [2]

The iron base, cobalt base and nickel base powder used for spraying (welding) contain 0.5%~4.0% boron. Amorphous fe-silicon-boron alloys containing boron, such as Feg2SisB3, can replace oriented silicon steel to make energy-saving transformers and other devices with low iron loss and small volume. Ndfeb permanent magnets such as Nd2Fe14B and Nd15Fe77B8 have the advantages of high remanence, high coercivity and high magnetic energy product, which are ideal materials for manufacturing permanent magnet parts.