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What is Wurtzite boron nitride

Wurtzite boron nitride (w-BN) is a metastable high-pressure polymorph of BN, which can only be fabricated as micrometer-size powders by the shock compression of hexagonal BN. Here, we fabricate millimeter-size w-BN bulk crystals and reveal an unprecedented stabilization mechanism for w-BN. The simulation showed that wurtzite boron nitride would withstand 18 percent more stress than diamond and lonsdaleite 58 percent more. If the results are confirmed with physical experiments, both materials would be far more complex than any measured substance. The Vickers hardness of pure polycrystalline wBN compact is first determined to be 46 GPa on average, not as hard as diamond. The material exhibits high thermal stability with an onset oxidation temperature of 920 °C in the air, much higher than diamond. Boron nitride exists in four primary crystalline forms. These have graphitic, cubic, rhombohedral, and wurtzite crystal structures. Wurtzitic boron nitride is formed at relatively low temperatures above 12 GPa pressure. First created in 1957 and known as cubic boron nitride, it was initially reported to be hard enough to scratch diamond – hopes that quickly dulled as later tests showed that it is less than half as hard as its carbon-based counterpart. "Lonsdaleite is even stronger than w-BN because lonsdaleite is made of carbon atoms, and w-BN consists of boron and nitrogen atoms," Chen explained. "The carbon-carbon bonds in lonsdaleite are stronger than boron-nitrogen bonds in w-BN. On the other hand, cubic boron nitride is hard and chemically stable. This makes it suitable for applications that require rigid material, e.g., bulletproof products. Some properties of BN ceramic make this compound a perfect alternative to the ceramic layer in bulletproof fabrics. If you are looking for high quality, high purity and cost-effective Wurtzite boron nitride, or if you require the latest price of Wurtzite boron nitride, please feel free to email contact mis-asia.

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