Rhenium diboride
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Rhenium diboride is a synthetic high-hardness material that was first made in 1962. The compound is formed from a mixture of rhenium, noted for its resistance to high pressure, and boron, which forms
Rhenium diboride, ReB2
Boron nitride
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Boron nitride is a thermally and chemically resistant refractory compound of boron and nitrogen with the chemical formula BN. It exists in various crystalline forms that are isoelectronic to a similar
Rhenium diboride
…pressure, potentially simplifying a mass production. However, the high cost of rhenium and commercial availability of alternatives such as polycrystalline c-BN, make a prospect of large-scale applications less likely. ReB2 can be made by at least three different methods at standard atmospheric pressure…
c-BN crystal structure
Structure of hexagonal boron nitride intercalated with potassium (B4N4K)
Top: absorption of cyclohexane by BN aerogel. Cyclohexane is stained with Sudan II red dye and is floating on water. Bottom: reuse of the aerogel after burning in air.
BN nanotubes are flame resistant, as shown in this comparative test of airplanes made of cellulose, carbon buckypaper and BN nanotube buckypaper.