By TRUNNANO | 22 June 2021 | 0 Comments
Wurtzite Boron Nitride and Its characteristics
Wurtzite Boron Nitride overview
Wurtzite Boron Nitride is a new superabrasive material that is manufactured by detonation. It is the next step in the boron nitride generation which includes a well-known superabrasive - cubic boron nitride, as well as, a graphite similar in structure - hexagonal boron nitride. This new material has a polycrystalline structure that provides superior cutting properties and, moreover, sharpens itself during cutting.
The structure of wurtzite-type boron nitride is very similar to that of diamond, but diamond is formed by carbon under high pressure for a certain period of time, while wurtzite-type boron nitride is formed under the conditions of high temperature and high pressure during a volcanic eruption. Hardness is 18% higher than diamond. Similar to diamonds, wurtzite boron nitride can be used in cutting tools and other fields that require very high hardness.
Synthesis of Wurtzite Boron Nitride
Wurtzite Boron Nitride is usually directly transformed from hBN under dynamic ultra-high pressure and high temperature conditions.
As early as the early 1960s, F.P. Bundy et al. established the hBN-BN (or Wurtzite Boron Nitride) phase transition diagram based on their experimental results, as shown in Figure.
F.p.. Bundy and F.r. Cortigan conducted a more detailed study on the direct transformation of BN allotropes in the pressure range of 4.0 to 13.0 GPa, and obtained the following conclusions:
(1) Under the pressure of 4.0~7.0Ga, no Wurtzite Boron Nitride is generated from hN, no matter through direct process or indirect process.
(2) At a pressure of 6.5 GPa and a high temperature of 1500°C to 2000°C, all tested hBN raw materials were transformed, at least partially transformed into cBN.
(3) The amount of cBN converted into cBN under a pressure of 6.5 GPa varies with the crystallization characteristics, actual particle size, and purity of the raw materials. Under this pressure, wB also transforms into cbN
(4) Under the pressure of 8.5 GPa, BN can be generated from hBN. At a temperature of about 200°C, both hBN and Wurtzite Boron Nitride are completely converted to cBN
(5) Under the pressure of 13.0GPa, hBN is easily converted to cBN, even more. . It can be transformed even at room temperature. When the temperature exceeds 800℃~1300℃, it is completely transformed into Wurtzite Boron Nitride. At a temperature of about 1200°C, Wurtzite Boron Nitride is completely converted to cBN, while cBN is maintained at a temperature of 1900°C for a long time without being reversed to WURTZITE BORON NITRIDE. At a temperature of 1700°C, with the participation of catalyst solvents, WURTZITE BORON NITRIDE Convert to cBN, and cBN does not convert to Wurtzite Boron Nitride.
(6 Practice shows that hBN must be pressurized to a pressure of 8.5GPa or higher to make it transform to a BN structure. Under the pressure of 8.5GPa, the temperature is required to be above 1400℃.
Application of Wurtzite Boron Nitride
Wurtzite-type boron nitride is a superhard material with a hardness close to that of diamond, and it is expected to replace diamond in many applications. In addition, wurtzite-type boron nitride is also a promising broadband semiconductor, which has the advantages of wider energy gap and higher thermal conductivity than gallium nitride, and is expected to be applied in high-performance electronic devices. However, wurtzite-type boron nitride is a high-pressure metastable phase, which is easily transformed into hexagonal boron nitride (with a structure similar to graphite) under normal pressure. Usually, only micron-sized fibers can be prepared by shock wave compression. Zinc-type boron nitride.
Wurtzite Boron Nitride Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years' experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. The Wurtzite Boron Nitride produced by our company has high purity, fine particle size and impurity content. Send us an email or click on the needed products to send an inquiry.
Wurtzite Boron Nitride is a new superabrasive material that is manufactured by detonation. It is the next step in the boron nitride generation which includes a well-known superabrasive - cubic boron nitride, as well as, a graphite similar in structure - hexagonal boron nitride. This new material has a polycrystalline structure that provides superior cutting properties and, moreover, sharpens itself during cutting.
The structure of wurtzite-type boron nitride is very similar to that of diamond, but diamond is formed by carbon under high pressure for a certain period of time, while wurtzite-type boron nitride is formed under the conditions of high temperature and high pressure during a volcanic eruption. Hardness is 18% higher than diamond. Similar to diamonds, wurtzite boron nitride can be used in cutting tools and other fields that require very high hardness.
Synthesis of Wurtzite Boron Nitride
Wurtzite Boron Nitride is usually directly transformed from hBN under dynamic ultra-high pressure and high temperature conditions.
As early as the early 1960s, F.P. Bundy et al. established the hBN-BN (or Wurtzite Boron Nitride) phase transition diagram based on their experimental results, as shown in Figure.
F.p.. Bundy and F.r. Cortigan conducted a more detailed study on the direct transformation of BN allotropes in the pressure range of 4.0 to 13.0 GPa, and obtained the following conclusions:
(1) Under the pressure of 4.0~7.0Ga, no Wurtzite Boron Nitride is generated from hN, no matter through direct process or indirect process.
(2) At a pressure of 6.5 GPa and a high temperature of 1500°C to 2000°C, all tested hBN raw materials were transformed, at least partially transformed into cBN.
(3) The amount of cBN converted into cBN under a pressure of 6.5 GPa varies with the crystallization characteristics, actual particle size, and purity of the raw materials. Under this pressure, wB also transforms into cbN
(4) Under the pressure of 8.5 GPa, BN can be generated from hBN. At a temperature of about 200°C, both hBN and Wurtzite Boron Nitride are completely converted to cBN
(5) Under the pressure of 13.0GPa, hBN is easily converted to cBN, even more. . It can be transformed even at room temperature. When the temperature exceeds 800℃~1300℃, it is completely transformed into Wurtzite Boron Nitride. At a temperature of about 1200°C, Wurtzite Boron Nitride is completely converted to cBN, while cBN is maintained at a temperature of 1900°C for a long time without being reversed to WURTZITE BORON NITRIDE. At a temperature of 1700°C, with the participation of catalyst solvents, WURTZITE BORON NITRIDE Convert to cBN, and cBN does not convert to Wurtzite Boron Nitride.
(6 Practice shows that hBN must be pressurized to a pressure of 8.5GPa or higher to make it transform to a BN structure. Under the pressure of 8.5GPa, the temperature is required to be above 1400℃.
Wurtzite-type boron nitride is a superhard material with a hardness close to that of diamond, and it is expected to replace diamond in many applications. In addition, wurtzite-type boron nitride is also a promising broadband semiconductor, which has the advantages of wider energy gap and higher thermal conductivity than gallium nitride, and is expected to be applied in high-performance electronic devices. However, wurtzite-type boron nitride is a high-pressure metastable phase, which is easily transformed into hexagonal boron nitride (with a structure similar to graphite) under normal pressure. Usually, only micron-sized fibers can be prepared by shock wave compression. Zinc-type boron nitride.
Wurtzite Boron Nitride Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years' experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. The Wurtzite Boron Nitride produced by our company has high purity, fine particle size and impurity content. Send us an email or click on the needed products to send an inquiry.
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