A Novel Method for Preparation of TaC Coating on C/C Composite Material

J Mater Sci Technol ›› 2005, Vol. 21 ›› Issue (03): 381-385.

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A Novel Method for Preparation of TaC Coating on C/C Composite Material

Hanwei HE, Kechao ZHOU, Xiang XIONG

State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China

Received:2003-10-13 Revised:2004-07-25 Online:2005-05-28 Published:2009-10-10
Contact: Hanwei HE

Abstract

Abstract: A new method for preparation of TaC coating on C/C composite material is reported. The amorphous ethylate tantalum jellied as the precursor is prepared and spread densely on the surface of the C/C composite material so as to form a multilayer film. In a graphitization furnace the multilayer film is transformed into TaC coating at various temperatures. Ethylate tantalum film is characterized by FT-IR (Fourier transform infrared) spectra, XRD (X-ray diffraction) and SEM (scanning electron microscopy) and TaC coating is characterized by XRD and SEM. At 1200℃ the coating contained TaC and Ta¬2O5, and at above 1400℃ only TaC is formed. The coating formed at 1600℃ is a continuous stratum structure, and that formed at 1600℃ is a porous net structure. Analysis on thermodynamics and formation mechanism of TaC indicates that, after ethylate tantalum is decomposed, Ta2O¬5 is first produced and then transformed into Ta2C, and newly formed Ta2C is transformed into TaC by the sufficient C at last.

Key words: C/C composite, TaC coating, Ethylate tantalum

Hanwei HE, Kechao ZHOU, Xiang XIONG. A Novel Method for Preparation of TaC Coating on C/C Composite Material[J]. J Mater Sci Technol, 2005, 21(03): 381-385.

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A Novel Method for Preparation of TaC Coating on C/C Composite Material

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