Preparation of a Ti-B-N Nanocomposite from a Hybrid Precursor of Polyborazine and TiH<sub>2</sub>

Dong-Jin Kim; Lan-Young Hong; Dong-Pyo Kim

Journal of Industrial and Engineering Chemistry, Vol.10, No.5, 821-825, September, 2004

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Preparation of a Ti-B-N Nanocomposite from a Hybrid Precursor of Polyborazine and TiH₂

Dong-Jin Kim, Lan-Young Hong¹, and Dong-Pyo Kim^†

Department of Fine Chemical Engineering & Chemistry, Chungnam National University, Daejeon 305-764, Korea
¹Advanced Materials Research Center, Chungnam National University, Daejeon 305-764, Korea

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A TiN/TiB₂/BN nanocomposite has been prepared by pyrolyzing a hybrid precursor, which contained less oxidative titanium hydride dispersed in a viscous polyborazine polymer as a BN precursor. The hybrid precursor showed a step-wise pyrolytic conversion starting from the decomposition of TiH₂ to pure Ti at 450℃ without vulnerable oxidation. This process was followed by the formation of a non-oxide composite phase that was composed of Ti₂N, TiN, and TiB₂ in amorphous BN at 900℃; finally, crystalline TiN and TiB₂ phases developed at 1100℃. When heated to 1300℃, the titanium-based phases adopted the nanocomposite state by what appeared to be an interdiffusion-type mechanism. Of particular interest is that a foam-like porous ceramic structure was formed by the liberation of H₂ from TiH₂. The reactions were investigated by TGA/DSC, XRD, SEM, and EPMA.

Keywords:hybrid precursor;TiB₂/TiN nanocomposite;active metal species;polyborazine

[References]

Weimer W, Carbide, Nitride, and Boride Materials Synthesis and Processing, Chapman & Hall, London, UK, pp. 1-42 (1997)
Paine RT, Narula CK, Chem. Rev., 90, 73 (1990)
Zhang GJ, J. Chin. Ceram. Soc., 21, 182 (1993)
Zhang GJ, Ceram. Int., 21, 29 (1995)
Millet P, Hwang T, J. Mater. Sci., 31(2), 351 (1996)
Arnell RD, Colligon JS, Minnebaev KF, Yurasova VE, Vacuum, 47, 425 (1996)
Losbichler P, Mitterer C, Gibson PN, Gissler W, Hofer F, Warbichler P, Surf. Coat. Technol., 94, 297 (1997)
Hammer P, Steiner A, Villa R, Baker M, Gibson PN, Haupt J, Gissler W, Surf. Coat. Technol., 68, 194 (1994)
Su K, Nowakowski M, Bonnell D, Sneddon LG, Chem. Mater., 4, 1139 (1992)
Moon KT, Min DS, Kim DP, Bull. Korean Chem. Soc., 19, 222 (1998)
Kim DP, Economy J, Chem. Mater., 6, 395 (1994)
Gissler W, Surf. Coat. Technol., 68, 556 (1994)
Fokin VN, Malov YI, Fokina EE, Troitskaya SL, Shilkin SP, Int. J. Hydrog. Energy, 20, 387 (1995)
Elezey M, Wadley HNG, Acta Mater., 49, 849 (2001)

[Referenced By]

[Related Articles]

[1] Weimer W, Carbide, Nitride, and Boride Materials Synthesis and Processing, Chapman & Hall, London, UK, pp. 1-42 (1997)

[2] Paine RT, Narula CK, Chem. Rev., 90, 73 (1990)

[3] Zhang GJ, J. Chin. Ceram. Soc., 21, 182 (1993)

[4] Zhang GJ, Ceram. Int., 21, 29 (1995)

[5] Millet P, Hwang T, J. Mater. Sci., 31(2), 351 (1996)

[6] Arnell RD, Colligon JS, Minnebaev KF, Yurasova VE, Vacuum, 47, 425 (1996)

[7] Losbichler P, Mitterer C, Gibson PN, Gissler W, Hofer F, Warbichler P, Surf. Coat. Technol., 94, 297 (1997)

[8] Hammer P, Steiner A, Villa R, Baker M, Gibson PN, Haupt J, Gissler W, Surf. Coat. Technol., 68, 194 (1994)

[9] Su K, Nowakowski M, Bonnell D, Sneddon LG, Chem. Mater., 4, 1139 (1992)

[10] Moon KT, Min DS, Kim DP, Bull. Korean Chem. Soc., 19, 222 (1998)

[11] Kim DP, Economy J, Chem. Mater., 6, 395 (1994)

[12] Gissler W, Surf. Coat. Technol., 68, 556 (1994)

[13] Fokin VN, Malov YI, Fokina EE, Troitskaya SL, Shilkin SP, Int. J. Hydrog. Energy, 20, 387 (1995)

[14] Elezey M, Wadley HNG, Acta Mater., 49, 849 (2001)