2nd Seminar of ICNSEE

Date 2010/03/10 (Wed)

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Summary

Date

2010/03/10 (Wed) 13:30-

Venue

5F Small seminar room, sengen

Sengen Site, National Institute for Materials Science
TEL: 029-859-2186

Organizer

Innovative Center of Nanomaterials Science for Environment and Energy(ICNSEE)

13:30-	Hard Nanocomposite Coatings: improved properties of grain-boundary dominated materials Dr. Joerg Patscheider EMPA,Group Leader Thin Films Ternary metal nitrides and carbides with appropriate nanostructures successfully promote hardness, oxidation resistance, improved wear behavior and other properties relevant for protective coatings. Examples are nc-TiN/a-Si3N4 and nc-TiC/a-C:H which are composed of distinct nanocrystalline (nc-) and amorphous (a-) phases. Most nanocomposite hard coatings with well-separated phases show a hardness maximum, as the composition is changed from the pure polycrystalline phase to compositions dominated by the amorphous phase. At the hardness maximum the domain size of the nanocrystalline phase is below 10 nm and the average thickness of the tissue layer separating the nanocrystals, amounts on an average to only one to two atomic bond lengths. Mutual solubility often leads to interfaces with gradual transitions between the constituting phases. The quality of the resulting interfaces and that of the tissue phase in terms of structural perfection and thickness is of decisive influence for the performance of the coatings.

13:30-

Hard Nanocomposite Coatings:

improved properties of grain-boundary dominated materials

Dr. Joerg Patscheider: EMPA,Group Leader Thin Films

Ternary metal nitrides and carbides with appropriate nanostructures successfully promote hardness, oxidation resistance, improved wear behavior and other properties relevant for protective coatings. Examples are nc-TiN/a-Si3N4 and nc-TiC/a-C:H which are composed of distinct nanocrystalline (nc-) and amorphous (a-) phases. Most nanocomposite hard coatings with well-separated phases show a hardness maximum, as the composition is changed from the pure polycrystalline phase to compositions dominated by the amorphous phase. At the hardness maximum the domain size of the nanocrystalline phase is below 10 nm and the average thickness of the tissue layer separating the nanocrystals, amounts on an average to only one to two atomic bond lengths. Mutual solubility often leads to interfaces with gradual transitions between the constituting phases. The quality of the resulting interfaces and that of the tissue phase in terms of structural perfection and thickness is of decisive influence for the performance of the coatings.