Microstructure Development During Sintering of TiC-Ni3A1 Cermets

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TiC-Ni{sub 3}Al cermets are under development for application in diesel engines because of desirable physical properties and wear resistance. Powder compacts with binder contents from 30-50 vol. % were fabricated by pressureless sintering under vacuum followed by low gas pressure isostatic pressing. Increasing the Ni{sub 3}Al content improved densification when using prealloyed powders as expected. However, when the Ni{sub 3}Al was formed by in-situ reaction synthesis of Ni and NiAl, densification decreased with higher binder contents. The final microstructure consisted of a ''core-rim'' structure with TiC cores surrounded by (Ti,W)C rims. In some cases, Ni and Al were also observed ... continued below

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15 pages

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Tiegs, T.N. October 22, 2001.

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TiC-Ni{sub 3}Al cermets are under development for application in diesel engines because of desirable physical properties and wear resistance. Powder compacts with binder contents from 30-50 vol. % were fabricated by pressureless sintering under vacuum followed by low gas pressure isostatic pressing. Increasing the Ni{sub 3}Al content improved densification when using prealloyed powders as expected. However, when the Ni{sub 3}Al was formed by in-situ reaction synthesis of Ni and NiAl, densification decreased with higher binder contents. The final microstructure consisted of a ''core-rim'' structure with TiC cores surrounded by (Ti,W)C rims. In some cases, Ni and Al were also observed in the peripheral region of the rim structure. Grain sizes of the TiC increased with binder content and temperature. Preferred orientation of the Ni{sub 3}Al binder phase was observed due to very large grain sizes on the order of millimeters.

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15 pages

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  • International Conf on Powder Metallurgy, Conference location not supplied, Conference dates not supplied

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  • Report No.: P99-102993
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 787972
  • Archival Resource Key: ark:/67531/metadc723706

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 22, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 25, 2016, 12:30 p.m.

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Tiegs, T.N. Microstructure Development During Sintering of TiC-Ni3A1 Cermets, article, October 22, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc723706/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.