Materials researchers at North Carolina State University have developed a new technology, diamond is deposited on the surface of cubic boron nitride (c-BN), combined into a new single crystal structure.
"This material can be used to make high-power devices, such as creating the next generation of smart grid required for solid state transformers," North Carolina State University Distinguished Professor of Materials Science and Engineering and lead author of the research paper Jay Narayan said.
"It can also be used to make tools, high-speed machining and deep drilling equipment," Narayan said. "
Diamond is hard but easily oxidized to a flexible graphite .c-BN cladding layer to prevent oxidation. Diamond also interact with the iron, making it difficult for the tool steel. Again, c-BN will solve this problem."
c-BN is a boron nitride having a cubic crystal structure (BN). It is similar to the performance of the
], but there are several advantages: c-BN has a high band gap, which makes it very attractive for power devices; c-BN can be "doped", so as to have a positive, negative charge layer, which means it can be used to make transistors; when exposed to oxygen, it forms a stable surface oxide layer, so that it is stable under high temperature conditions. Earlier this year, Narayan announced a faster, cheaper manufacturing c-BN technology.
The researchers first create a c-BN substrate to create epitaxial, or single crystal diamond / c-BN structure. This uses a new technology Narayan released earlier this year. Then by pulsed laser deposition method at 500 ℃ and atmospheric pressure to optimize diamond deposit in c-BN surface. Using a pulsed laser technology is able to control the thickness of the diamond layer.
"This is a single chamber to complete all the work, the process is more energy-efficient, more timeliness," Narayan said. "Just use solid carbon and boron nitride can be, it is more environmentally friendly than traditional techniques."
The researchers also using conventional chemical vapor deposition technique in the c-BN deposited diamond surface, but this requires the use of methane, hydrogen, and a tungsten filament 900 ° C.
"Chemical vapor deposition method can be done, but we have a better effect of pulsed laser deposition method does not involve toxic gases, can be done at lower
temperatures." Narayan said.
Narayan has co-founded a company, q-carbon limited liability company. The company has licensed the technology, is committed to the commercialization of the technology used in multiple applications.
Copyright © boreway.com
Home |
About Us |
Products |
Quality Control |
News |
FAQ |
Contact Us |
Site Map