TY - JOUR

T1 - Thermo-physical properties of coatings in the Ti(B,N) system grown by chemical vapor deposition

AU - Kainz, Christina

AU - Schalk, Nina

AU - Tkadletz, Michael

AU - Saringer, Christian

AU - Winkler, Markus

AU - Stark, Andreas

AU - Schell, Norbert

AU - Julin, Jaakko

AU - Czettl, Christoph

N1 - Publisher Copyright: © 2019 Elsevier B.V.

PY - 2020/2/25

Y1 - 2020/2/25

N2 - Hard protective coatings are commonly subjected to temperatures exceeding 1000 °C, which has significant influence on their thermo-physical properties and the associated performance in application. Within the present work, temperature dependent physical properties of coatings within the Ti(B,N) system grown by chemical vapor deposition were correlated with their chemical composition. High-energy X-ray diffraction experiments in inert atmosphere proved that TiN, TiB 2 and ternary TiB xN y coatings with varying B contents are thermally stable up to 1000 °C. In-plane strains of TiN and TiB xN y coatings diminish during heating, whereas TiB 2 exhibits compressive strain enhancement up to the deposition temperature. Nanocrystalline TiB 2 exhibits more pronounced grain growth during annealing compared to coarse grained columnar TiN. Within the investigated coatings, the mean thermal expansion coefficient decreases as the B content increases. The same trend was observed for the thermal conductivity, which correlates with the grain size of the coatings.

AB - Hard protective coatings are commonly subjected to temperatures exceeding 1000 °C, which has significant influence on their thermo-physical properties and the associated performance in application. Within the present work, temperature dependent physical properties of coatings within the Ti(B,N) system grown by chemical vapor deposition were correlated with their chemical composition. High-energy X-ray diffraction experiments in inert atmosphere proved that TiN, TiB 2 and ternary TiB xN y coatings with varying B contents are thermally stable up to 1000 °C. In-plane strains of TiN and TiB xN y coatings diminish during heating, whereas TiB 2 exhibits compressive strain enhancement up to the deposition temperature. Nanocrystalline TiB 2 exhibits more pronounced grain growth during annealing compared to coarse grained columnar TiN. Within the investigated coatings, the mean thermal expansion coefficient decreases as the B content increases. The same trend was observed for the thermal conductivity, which correlates with the grain size of the coatings.

UR - http://www.scopus.com/inward/record.url?scp=85077341083&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2019.125318

DO - 10.1016/j.surfcoat.2019.125318

M3 - Article

VL - 384.2020

JO - Surface & coatings technology

JF - Surface & coatings technology

SN - 0257-8972

IS - 25 February

M1 - 125318

ER -