New diamond deposition process has industry applications

C-BN is a form of boron nitride with a cubic crystalline structure. It has similar properties to diamond but also a number of advantages, including a higher bandgap that makes it useful in power-intensive devices. C-BN can be “doped” to give it positively and negatively-charged layers, meaning it could be used to make transistors. The material also forms a stable oxide layer on its surface when exposed to oxygen, making it stable at high temperatures.

“This could be used to create high-power devices, such as the solid state transformers needed to create the next generation ‘smart’ power grid,” said Jay Narayan, Professor of Materials Science and Engineering at NC State and lead author of the research paper, which appears in the Journal of Applied Physics.

“It could also be used to create cutting tools, high-speed machining and deep sea drilling equipment. Diamond is hard, but it tends to oxidise, transforming into graphite – which is softer. A coating of c-BN would prevent oxidation. Diamond also interacts with iron, making it difficult to use with steel tools. Again, c-BN would address the problem.”