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| OXIDATION BEHAVIOR OF A NOVEL Ti-Si-C-N SUPERHARD NANOCOMPOSITE COATINGS AT ELEVATED TEMPERATURE |
| Yan GUO |
| 西安交通大学材料学院金属材料强度国家重点实验室表面组 |
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Cite this article:
Yan GUO. OXIDATION BEHAVIOR OF A NOVEL Ti-Si-C-N SUPERHARD NANOCOMPOSITE COATINGS AT ELEVATED TEMPERATURE. Acta Metall Sin, 2007, 43(2): 159-164 .
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Abstract Superhard nanocomposite Ti-Si-C-N coatings were deposited on substrate of high speed steel using an industrial pulsed d.c. plasma chemical vapor deposition set-up. Detailed microstructure examined by means of XRD, XPS and TEM suggested that the Ti-Si-C-N coatings are a nanocomposite structure composed of nanocrystalline Ti(C, N) and amorphous carbon and Si3N4, occasionally h-Si3N4. Ti(C, N) showed a strong 200 preferred orientation. With Ti content increasing and Si content decreasing, high-temperature oxidation resistance gain improvement gradually. When Ti and Si contents were 17.8at. % and 8.7at. %, respectively, nanocrystals of Si3N4 in the coating were dispersed on an amorphous matrix.The kind of coatings exhibited a much higher temperature (900℃) oxidation resistance. The possible origin of high-temperature of Ti-Si-C-N coating is explained that with increasing Si content, increasing amorphous Si3N4 thickness/layers and h-Si3N4dispersed in the matrix act as an efficient diffusion barrier against oxygen diffusion, which is helpful for improvement of oxidation resistance. Two-stage oxidation process involving mass gain and loss were observed, and the failure of the coating took place in the process of mass loss in the coating.
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Received: 01 June 2006
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