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Article

Thermal Stability of TiN Coated Cubic Boron Nitride Powder

1
Institute for Materials Science, Dresden University of Technology, 01062 Dresden, Germany
2
Fraunhofer IKTS, Fraunhofer Institute for Ceramic Technologies and Systems, 01277 Dresden, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Maciej Sitarz
Materials 2021, 14(7), 1642; https://doi.org/10.3390/ma14071642
Received: 26 February 2021 / Revised: 12 March 2021 / Accepted: 24 March 2021 / Published: 27 March 2021
Wear-resistant, super hard ceramic composites based on cubic boron nitride (cBN) are of great interest to industry. However, cBN is metastable under sintering conditions at normal pressure and converts into the soft hexagonal BN (hBN). Therefore, efforts are being made to avoid this process. Besides short sintering times, the use of coated cBN-particles is a way to minimize this process. Therefore, the thermal stability of TiN coated cBN powders in high purity argon and nitrogen atmospheres up to temperatures of 1600 °C was investigated by thermogravimetry, X-ray phase analysis, scanning electron microscopy and Raman spectroscopy. The TiN coating was prepared by the atomic layer deposition (ALD)-method. The investigations showed that the TiN layer reacts in Ar at T ≥ 1200 °C with the cBN and forms a porous TiB2 layer. No reaction takes place in nitrogen up to temperatures of 1600 °C. Nevertheless, the 20 and 50 nm thin coatings also undergo a recrystallization process during heat treatment up to temperatures of 1600 °C. View Full-Text
Keywords: cubic boron nitride; cBN; titanium nitride; TiN; coating; thermal stability; hexagonal boron nitride; hBN; phase transformation; microstructure cubic boron nitride; cBN; titanium nitride; TiN; coating; thermal stability; hexagonal boron nitride; hBN; phase transformation; microstructure
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MDPI and ACS Style

Hering, B.; Wolfrum, A.-K.; Gestrich, T.; Herrmann, M. Thermal Stability of TiN Coated Cubic Boron Nitride Powder. Materials 2021, 14, 1642. https://doi.org/10.3390/ma14071642

AMA Style

Hering B, Wolfrum A-K, Gestrich T, Herrmann M. Thermal Stability of TiN Coated Cubic Boron Nitride Powder. Materials. 2021; 14(7):1642. https://doi.org/10.3390/ma14071642

Chicago/Turabian Style

Hering, Benjamin, Anne-Kathrin Wolfrum, Tim Gestrich, and Mathias Herrmann. 2021. "Thermal Stability of TiN Coated Cubic Boron Nitride Powder" Materials 14, no. 7: 1642. https://doi.org/10.3390/ma14071642

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