Oxidation of materials based on boron nitride

Tsapuk, A. K.; Podobeda, L. G.; Kovalevskii, N.N.

doi:10.1007/bf00791430

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Fig 5 -Isothermal Volatilization Kinetics Of B203 Powder1

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1993

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“…The corresponding Arrhenius plot (Fig. 6 ) leads to an apparent activation energy of evaporation (E#180 kJ/mol) in accordance with Tsapuk's previous work [9]. Nevertheless, the evaporation rates determined in the present study are approximatively two orders smaller.…”

Section: Fig 5 -Isothermal Volatilization Kinetics Of B203 Powdersupporting

confidence: 91%

Protection against oxidation of C/SiC composites: oxidation behaviour of CVD TiB₂ coated substrates

Courtois

Desmaison

Tawil³

1993

J. Phys. IV France

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Titanium diboride coatings (20 or 30 pm thick), deposited by hydrogen reduction of TiC14 and BC13, are protecting CISiC substrates against oxidation up to 1100 OC. The oxidation of TiB2 leads to the formation of a protective low viscosity B2O3 glass filling the cracks of the primary CVD-Sic oxygen barrier. Above this temperature, the rapid consumption of the Bz03 glass by vaporization limits the duration of the protection system. A comprehensive description of the oxidation mechanism, based on a complementary experimental study of B203 evaporation, is presented.

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Section: Fig 5 -Isothermal Volatilization Kinetics Of B203 Powdersupporting

confidence: 91%