Lifetime Response of a Hi-Nicalon Fiber-Reinforced Melt-Infiltrated SiC Matrix Composites

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Lifetime studies in four-point flexure were performed on a Hi-Nicalon<sup>TM</sup> fiber-reinforced SiC matrix composite over a temperature range of 700 degrees to 1150 degrees C in air. The composite consisted of ~40 vol. % Hi-Nicalon<sup>TM</sup> fiber (8-harness weave) with a 0.5 Mu-m BN fiber coating and a melt-infiltration SiC matrix wand was tested with as-machined surfaces. Lifetime results indicated that the composite exhibited a stress-dependent lifetime at stress levels above an apparent fatigue limit, similar to the trend observed in CG-Nicalon<sup>TM</sup> fiber reinforced CVI SiC matrix composites. At less than or equal to 950 degrees C, the lifetimes of Hi-Nicalon/MI ... continued below

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10 pages

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Becher, P.F.; Lin, H.T. & Singh, M. April 25, 1999.

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Lifetime studies in four-point flexure were performed on a Hi-Nicalon<sup>TM</sup> fiber-reinforced SiC matrix composite over a temperature range of 700 degrees to 1150 degrees C in air. The composite consisted of ~40 vol. % Hi-Nicalon<sup>TM</sup> fiber (8-harness weave) with a 0.5 Mu-m BN fiber coating and a melt-infiltration SiC matrix wand was tested with as-machined surfaces. Lifetime results indicated that the composite exhibited a stress-dependent lifetime at stress levels above an apparent fatigue limit, similar to the trend observed in CG-Nicalon<sup>TM</sup> fiber reinforced CVI SiC matrix composites. At less than or equal to 950 degrees C, the lifetimes of Hi-Nicalon/MI SiC composites decreased with increasing applied stress level and test temperature. However, the lifetimes were extended as test temperature increased from 950 degees to 1150 degrees C as a result of surface crack sealing due to glass formation by the oxidation of Mi SiC matrix. The lifetime governing processes were, in general, attributed to the progressive oxidation of BN fiber coating and formation of glassy phase, which formed a strong bond between fiber and matrix, resulting in embrittlement of the composite with time.

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10 pages

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  • American Ceramic Society Anual Meeting, Indianapolis, IN, April 25-28, 1999

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  • Other: DE00006877
  • Report No.: ORNL/CP-102833
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 6877
  • Archival Resource Key: ark:/67531/metadc707440

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  • April 25, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 6, 2017, 3:57 p.m.

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Becher, P.F.; Lin, H.T. & Singh, M. Lifetime Response of a Hi-Nicalon Fiber-Reinforced Melt-Infiltrated SiC Matrix Composites, article, April 25, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc707440/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.