Toughening behavior in ceramics and cermets

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The development of high strength ({ge} 1 GPa), high toughness ({ge} 10 MPa {radical}m) ceramic systems is being examined using two approaches. In silicon nitride, toughening is achieved by the introduction of large prismatic shaped grains dispersed in a fine grain matrix. For the system examined herein, both the microstructure and the composition must be controlled. A distinctly bimodal distribution of grain diameters combined with controlled yttria to alumina ratio in additives to promote interfacial debonding is required. Using a cermet approach, ductile Ni{sub 3}Al-bonded TiC exhibited toughening due to plastic deformation within the Ni{sub 3}Al binder phase assisted by ... continued below

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6 p.

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Becher, P.F.; Sun, E.Y.; Hsueh, C.H.; Plucknett, K.P.; Kim, H.D.; Hirao, K. et al. October 1, 1998.

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Description

The development of high strength ({ge} 1 GPa), high toughness ({ge} 10 MPa {radical}m) ceramic systems is being examined using two approaches. In silicon nitride, toughening is achieved by the introduction of large prismatic shaped grains dispersed in a fine grain matrix. For the system examined herein, both the microstructure and the composition must be controlled. A distinctly bimodal distribution of grain diameters combined with controlled yttria to alumina ratio in additives to promote interfacial debonding is required. Using a cermet approach, ductile Ni{sub 3}Al-bonded TiC exhibited toughening due to plastic deformation within the Ni{sub 3}Al binder phase assisted by interfacial debonding and cleavage of TiC grains. The TiC-Ni{sub 3}Al cermets have toughness values equal to those of the WC-Co cermets. Furthermore, the TiC-Ni{sub 3}Al cermets exhibit high strengths that are retained in air to temperatures of {approximately} 1,000 C.

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6 p.

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OSTI as DE98004926

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  • Engineering ceramics `98 conference, Osaka (Japan), 7-9 Oct 1998

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  • Other: DE98004926
  • Report No.: ORNL/CP--96826
  • Report No.: CONF-981027--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/674976 | External Link
  • Office of Scientific & Technical Information Report Number: 674976
  • Archival Resource Key: ark:/67531/metadc703264

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  • October 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Sept. 1, 2016, 1:38 p.m.

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Becher, P.F.; Sun, E.Y.; Hsueh, C.H.; Plucknett, K.P.; Kim, H.D.; Hirao, K. et al. Toughening behavior in ceramics and cermets, report, October 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc703264/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.