Numéro
J. Phys. IV France
Volume 03, Numéro C3, Août 1993
Proceedings of the Ninth European Conference on Chemical Vapour Deposition
Page(s) C3-511 - C3-518
DOI http://dx.doi.org/10.1051/jp4:1993371
Proceedings of the Ninth European Conference on Chemical Vapour Deposition

J. Phys. IV France 03 (1993) C3-511-C3-518

DOI: 10.1051/jp4:1993371

Titanium borides deposited by chemical vapor deposition thermodynamic calculation and experiments

M. NADAL, T. GRENET and F. TEYSSANDIER

Institut de Science et de Génie des Matériaux et Procédés, Université de Perpignan, 52 avenue de Villeneuve, 66860 Perpignan cedex, France


Abstract
The deposition conditions of titanium diboride and titanium monoboride were calculated under the thermodynamic equilibrium assumption and experimentally checked. The theoretical deposition diagram was calculated by the SOLGASMIX program. All the gaseous and condensed species were taken into account. The initial gas mixture was composed of titanium tetrachloride, boron trichlonde and hydrogen. The calculated diagram shows that low partial pressures of boron trichloride and titanium tetrachloride are both required in order to be able to deposit titanium monoboride. The deposition experiments were canied out at atmospheric pressure in a cold wall reactor. The substrates were either molybdenum or molybdenum coated by Tic. They were inductively heated by a RF coi1 to the deposition temperature (1473 K). Special devices were used to reach the low partial pressures of titanium tetrachloride and boron trichloride necessary to deposit titanium monoboride. The nature of the coatings were determined by X-ray diffraction and EPMA-WDS. Titanium dibonde as well as titanium monoboride was obtained by varying the composition of the initial gas phase. The hardness of TiB2was measured by ultra low load indentation.



© EDP Sciences 1993