Iron diboride

Iron diboride, FeB2, has been prepared in a similar manner to the sub-boride, and represents the maximum limit of combination of iron with boron. Its density is 5 it is slightly yellow in colour, hard, and friable, being readily oxidised by moist air.7... 

Apart from the diborides, also some monoborides are technically important. Most of them are used as hard components in composite materials. One notable compound is FeB. It has a remarkable adhesiveness on iron-based materials and thus increases their hardness. Such hard coatings are produced via CVD techniques. As an intermediate product elementary boron is obtained through the reaction 2BCI3 -I- 3H2 — 2B -1- 6HC1 between 500 and 900°C, which subsequently reacts with iron to form the FeB coating [32,34]. 

Suitable metallic fillers may be composed of aluminum, copper, magnesium, chromium, tin, nickel, silver, iron, titanium, and alloys, such as stainless steels, bronzes. In addition, metal fillers may comprise intermetallic chemical compounds, such as titanium diboride and carbides of the above metals. Further, conductive non-metal fillers may comprise tin oxide, indium tin oxide, etc (7). 

M-A Einarsrud, E Hagen, G Pettersen, T Grande. Pressureless sintering of titanium diboride with nickel, nickel boride and iron additives. J Am Ceram Soc 80 3013, 1997. 

Einarsrud, M., Hagen, E., Pettersen, G., Grande, T. (1997). Pressureless sintering of Titanium diboride with Nickel, Nickel Boride, and Iron additives. Journal of the American Ceramic Society, 80, 3013-3020. doi 10.1111/j.l 151-2916.1997. tb03227.x. 

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