Elevated temperature static fatigue of a Nicalon fiber-reinforced SiC composite

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Description

Static fatigue tests of a Nicalon fiber-reinforced SiC matrix composite were conducted in four-point bending over a temperature range of 425 to 1,150 C in air at selected stress levels. The composite consisted of a Nicalon cloth with a 0.3 {mu}m graphite interfacial coating and a Forced Chemical Vapor Infiltration (FCVI) SiC matrix composite; samples were tested with or without a final protective SiC seal coat. The results indicated that the fatigue life of the Nicalon-SiC composite decreased with an increase in either applied stresses or test temperatures. However, the composite exhibited a fatigue limit of {approximately} 100 MPa at ... continued below

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6 p.

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Lin, H.T.; Becher, P.F. & Tortorelli, P.F. December 31, 1994.

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Description

Static fatigue tests of a Nicalon fiber-reinforced SiC matrix composite were conducted in four-point bending over a temperature range of 425 to 1,150 C in air at selected stress levels. The composite consisted of a Nicalon cloth with a 0.3 {mu}m graphite interfacial coating and a Forced Chemical Vapor Infiltration (FCVI) SiC matrix composite; samples were tested with or without a final protective SiC seal coat. The results indicated that the fatigue life of the Nicalon-SiC composite decreased with an increase in either applied stresses or test temperatures. However, the composite exhibited a fatigue limit of {approximately} 100 MPa at temperatures < 950 C which decreased to {approximately} 70 MPa at 1,150 C. Both electron microscopy and thermogravimetric studies suggested that the lifetime of the composites was dictated by the oxidation of graphite interfacial layer at temperatures {le} 700 C and by oxidation of graphite coating accompanied by formation of silicate interfacial layer via oxidation of the Nicalon fiber (and the SiC matrix) at temperatures {ge} 950 C. Use of a SiC seal coat effectively retarded the oxidation reactions and increased the lifetime by at least one order of magnitude at 425 C. On the other hand, the SiC seal coat made little (if any) difference in fatigue life at 950 C.

Physical Description

6 p.

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OSTI as DE95008780

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95008780
  • Report No.: CONF-941144--95
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/34427 | External Link
  • Office of Scientific & Technical Information Report Number: 34427
  • Archival Resource Key: ark:/67531/metadc675700

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  • December 31, 1994

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 21, 2016, 8:10 p.m.

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Lin, H.T.; Becher, P.F. & Tortorelli, P.F. Elevated temperature static fatigue of a Nicalon fiber-reinforced SiC composite, report, December 31, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc675700/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.