Iron Boride（FeB） 

Chinese Name: Iron borate

Chemical formula: Feb

Molecular weight: 66.66

Melting point: 1652 ℃

Density: 7.15g/ml (25/4 ℃)

CAS No.: 12006-84-7

Production method:

1. Mix boron and iron in a molar ratio of 1:1, and heat them in argon at 1200 ~ 1300 ℃.

2. FES and BCl3 are reacted in hydrogen at a temperature higher than 500 ℃, or

 prepared by the reaction of ferrous chloride solution with sodium borohydride (NaBH4).

Material structure:

Iron borate is arranged in a sawtooth chain shape, with iron atoms on the corners

 of the triangular prism, while boron atoms are located in the center of the triangular

 prism and connected in the sawtooth chain in the form of covalent bonds.

Physical and chemical properties:

The melting point of iron borate is 1652 ℃, the density is 7.15g/ml, and it is dissolved

 in dilute and concentrated nitric acid, concentrated and 1:1 hydrochloric acid solution,

 1:1 H2SO4 and HClO4, μ eff=1.1 μ B。 At low temperature α- Exists in the form of with

 the same TC (602k) at high temperature β- Shape exists. With the change of magnetic

 moment α towards β Type transformation. Both can form ferromagnets. React with 

boiling water. It is hard, refractory and has good corrosion resistance.

Iron borate has ceramic properties, such as high hardness, and metal properties, such

 as thermal conductivity and conductivity. Boride coating on iron surface has excellent

 mechanical properties, friction properties and corrosion resistance. Ferroboron (Feb) 

is a gray powder, insoluble in water. Feb is harder than Fe2B, but more brittle, and easier

to break under impact.

Purpose:

1. Target;

2. Ferroboron is a strong deoxidizer and boron additive in steelmaking production. The

 biggest role of boron in steel is to significantly improve the hardenability and replace

 a large number of alloy elements with only a very small amount of boron. In addition, 

it can also improve the mechanical properties, cold deformation properties, welding 

properties and high temperature properties.  

Preparation of ultrafine iron borate:

After mixing ferrous gluconate solution with boric acid solution, spray drying is carried 

out to obtain spray drying material. The molar ratio of ferrous gluconate solution to boric

 acid is 1:1.01  1.02； The spray dried material was sintered in methane atmosphere for

 5 hours  10h, sintering temperature 800  Reaction at 1200 ℃ to obtain the reducing 

material; Continue to inject carbon dioxide into the reducing material at the temperature

 of 700  850 ℃ reaction 2  4h, get sinter; Superfine iron borate is obtained by crushing, 

screening and vacuum packaging the sintered material. This method can prepare ultrafine 

iron borate with small particle size, large bet and high purity.