Additives iron boride

Other ways for preparing BN are the reactions of calcium-boride (CaB6) with additions of boric acid in nitrogen atmosphere at temperatures exceeding 1500 °C [94, 95], or the synthesis from iron boride (FeB) with ammonia at 550 °C and subsequent annealing in ammonia at 1000 °C [96]. 

Niobium additions were furthermore said to markedly inerease hardness and tensile strength of B-Fe alloys air-cooled from 950 or 1100°C and water quenehed duetility and toughness of the alloy, however, decreased with Nb additions [1966Has]. A general survey of the effect of concentration and transition metals on crystallization of Fe based amorphous alloys was given by [1987She]. [1980Che] evaluated some key physico-mechanieal properties of iron-boride materials alloyed with Nb, Mo, and W. 

Other Reductions. The (porphinato)irons could realize the reduction of alkenes and alkynes with NaBILj. Various unsaturated carbon-carbon bonds were saturated by meso-tetraphenylporphinatoiron chloride (TPPFe Cl) derivatives (up to 81% yield). Ruthenium(III) complexes also pair with NaBH in the reduction of unsaturated carbon-carbon bonds (as does cobalt boride). In the presence of a catalytic amount of Ru(PPh3)4H2 (0.5-1 mol %) and NaBHj, unsaturated carbon-carbon bonds in a wide variety of alkenes and alkynes were saturated in toluene at 100 Addition of water was required to provide a proton source. Similar systems with RUCI3 in aqueous solution reduce unsaturated bonds under milder conditions. Various unactivated mono- or disubstituted olefins and activated trisubstituted olefins were reduced with RUCI3 (10 mol %) and NaBH4 in THF-H2O at 0 °C to room temperature (eq 36). When the RuCl3-catalyzed reductions of olefins were carried out in aqueous amide solution, unactivated trisubstituted olefins were also hydrogenated. ... 

The transition metals form carbides, nitrides, and borides with nonstoi-chiometric ratios. Some of these materials are interstitial compounds, which means there are large gaps in between the metal atoms that can be filled by other small elements such as hydrogen, nitrogen, and carbon. When interstitial compounds form, the additional atoms are locked into place in the metal framework, making these materials stronger than the metal by itself. This is important in a number of industrial applications such impregnating a small amount of carbon into an iron matrix in order to make steel. 

Besides the high-tech applications of novel materials, it should not be forgotten that there was and still is a tremendous market for borides in the metallurgy of steel and iron, e.g., for antioxidizing additives in refractory linings or as alloying ingredients for the metals. 

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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