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“This material can be used to make high-power devices, such as the solid-state transformers needed to create the next-generation smart grid,†said Jay Narayan, Distinguished Chair Professor of Materials Science and Engineering at North Carolina State University and lead author of the research paper.
“It can also be used to make tools, high-speed machining and deep-sea drilling equipment,†says Narayan. “Diamond is very hard but it is also easily oxidized into soft graphite. The c-BN coating prevents oxidation. Diamond also interacts with iron, making it difficult to use in steel tools. Again, c-BN will solve this problem.â€
c-BN is a boron nitride (BN) having a cubic crystal structure. It is similar in performance to diamond, but has several advantages: c-BN has a higher band gap, which makes it attractive for high power devices; c-BN can be "doped" to make it positive, A negatively charged layer means that it can be used to make transistors; when exposed to oxygen, its surface forms a stable oxide layer that stabilizes it at high temperatures. Earlier this year, Narayan announced a faster, cheaper technology for manufacturing c-BN.
The researchers first created a c-BN matrix to create epitaxial, or single-crystal, diamond/c-BN structures. This uses the new technology that Narayan released earlier this year. Diamond was then deposited on the c-BN surface using pulsed laser deposition at 500 ° C and optimized atmospheric pressure. The thickness of the diamond layer can be controlled using pulsed laser technology.
“This completes all the work in a single chamber, and the process is more energy efficient and time efficient,†says Narayan. “Just use solid carbon and boron nitride, which is more environmentally friendly than traditional technology.â€
Researchers can also use conventional chemical vapor deposition techniques to deposit diamond on the c-BN surface, but this requires the use of methane gas, hydrogen, and a tungsten filament at 900 °C.
“The chemical vapor deposition method can do this, but our pulsed laser deposition method works better and does not involve toxic gases, which can be done at lower temperatures,†says Narayan.
Narayan has co-founded a company, q-carbon LLC. The company is licensed to implement the technology and commercialize it in multiple applications. (Institute of Electronic Science and Technology Information, Ministry of Industry and Information Technology)
Abstract Recently, materials researchers at North Carolina State University have developed a new technology to deposit diamond on a cubic boron nitride surface (c-BN) and combine it into a new single crystal structure. "This material can
Recently, materials researchers at North Carolina State University have developed a new technology that combines diamonds on a cubic boron nitride surface (c-BN) to form a new single crystal structure.