Oxidation Behaviors of TiB₂-TiC_X and TiB₂-TiC_X/15SiC Ceramics

Abstract:

Fully dense samples of TiB2-TiCX and TiB2-TiCX/15SiC ceramic composites were fabricated by in-situ synthesis under hot isostatic pressing from TiH2, B4C and SiC powders. Their oxidized behaviors at different temperatures were tested. Optical micrograph studies and thermo-gravimetric analyses show that the highest effective temperature of oxidation resistance is 700°C for TiB2-TiCX, and 1100°C for TiB2-TiCX/15SiC. The weight gain of TiB2-TiCX/15SiC below 1100°C is quite low, and it rises up suddenly when the temperature reaches 1200°C. Thus, the highest effective temperature of oxidation resistance is 1100°C for TiB2-TiCX/15SiC. The oxidation dynamic curves of TiB2-TiCX/15SiC ceramics accord with the parabola’s law. The activation energy of TiB2-TiCx/15SiC (189.87kJ.mol-1) is higher than that of TiB2-TiCx (96.44kJ.mol-1). In the oxidation process of TiB2-TiCx/15SiC, TiB2 reacts with oxygen and generates TiO2 and B2O3 at first. A layer of whole homogeneous oxide film cannot be formed, in the mean time, the oxidation of TiC begins. When temperature goes up to 1000°C, TiC phase is totally oxidized. SiC is oxidized to SiO2 at about 900°C, Meanwhile, TiO2 forms denser film than B2O3, which grows and covers the surface of the material, and gives better property of oxidation resistance.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 179-183
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.179
• Online since: April 2010
• Authors: De Gui Zhu, Hong Liang Sun, Yu Shu Wang, Liang Hui Wang
• Keywords: Hot Isostatic Pressing (HIP), Oxidation Behavior, TiB₂-TiC_x/SiC Composite

References

[1] R. Lörcher, R. Telle and G. Petzow: Mater. Sci. Eng. A Vol. 105-106 (1988), p.117.

[2] W.S. Williams: J. Appl. Phys. Vol. 35 (1964), p.1329.

[3] J. Ramberg, C. Wolfe and W. Williams: J. Am. Ceram. Soc. Vol. 68 (1985), p.78.

[4] I. Gotman, N.A. Travitzky and E.Y. Gutmanas: Mater. Sci. Eng. Vol. 244 (1998), p.127.

[5] I. Song, L. Wang, M. Wixom, et al.: J. Mater. Sci. Vol. 35 (2000), p.2611.

[6] M. Cirakoglu, Z.X. Peng, et al.: Ceram. Eng. Sci. Vol. 21 (2000), p.737.

[7] L. Filipuzzi and R. Naslain: J. Am. Ceram. Soc. Vol. 77(1994), p.467.

[8] J. Zhao, L. Liu, et al.: Mater. Lett. Vol. 60 (2006), p. (1964).

[9] R. J. Charles and F. E. Wagstaff: J. Am. Ceram. Soc. Vol. 51(2006), p.16.

[10] N. Takayuki, G. Takashi and H. Toshio, J. Am. Ceram. Soc. Vol. 72 (2005), p.1386.