High-temperature compressive deformation of Si{sub 3}N{sub 4}/BN fibrous monoliths.

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Fibrous monolithic Si{sub 3}N{sub 4}/BN ({approx}85 vol.% Si{sub 3}N{sub 4}/15 vol.% BN) and monolithic Si{sub 3}N{sub 4} ceramics were compressed at a nearly constant strain rate ({var_epsilon}) at 1200-1400 C in N{sub 2}. The {var_epsilon} range was {approx}1 x 10{sup {minus}6} to 5 x 10{sup {minus}6} s{sup {minus}1}; the stress ({sigma}) range was 37-202 MPa. The Si{sub 3}N{sub 4} and the unidirectional fibrous monoliths that were oriented with the long axis of the Si{sub 3}N{sub 4} cells parallel to the compression direction exhibited plasticity at 1300 and 1400 C, with {var_epsilon} {proportional_to} {sigma}. A 0/90{degree} cross-ply Si{sub 3}N{sub 4}/BN laminate ... continued below

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11 p.

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Routbort, J. L. February 4, 1999.

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Fibrous monolithic Si{sub 3}N{sub 4}/BN ({approx}85 vol.% Si{sub 3}N{sub 4}/15 vol.% BN) and monolithic Si{sub 3}N{sub 4} ceramics were compressed at a nearly constant strain rate ({var_epsilon}) at 1200-1400 C in N{sub 2}. The {var_epsilon} range was {approx}1 x 10{sup {minus}6} to 5 x 10{sup {minus}6} s{sup {minus}1}; the stress ({sigma}) range was 37-202 MPa. The Si{sub 3}N{sub 4} and the unidirectional fibrous monoliths that were oriented with the long axis of the Si{sub 3}N{sub 4} cells parallel to the compression direction exhibited plasticity at 1300 and 1400 C, with {var_epsilon} {proportional_to} {sigma}. A 0/90{degree} cross-ply Si{sub 3}N{sub 4}/BN laminate also exhibited significant plasticity, but it was weaker than the above-mentioned ceramics. The unidirectional fibrous monoliths that were compressed perpendicular to the cell direction fractured at {approx}50 MPa in all tests. A {+-}45{degree} laminate tested at 1300 C fractured at a stress of {approx}40 MPa. Low fracture stress correlated with shear through BN layers.

Physical Description

11 p.

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OSTI as DE00010938

Medium: P; Size: 11 pages

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  • 23rd Annual Cocoa Beach Conference and Exposition, Cocoa Beach, FL (US), 01/25/1999--01/29/1999

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  • Report No.: ANL/ET/CP-97126
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10938
  • Archival Resource Key: ark:/67531/metadc625415

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  • February 4, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 7:38 p.m.

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Routbort, J. L. High-temperature compressive deformation of Si{sub 3}N{sub 4}/BN fibrous monoliths., article, February 4, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc625415/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.