2D SiC&lt;sub&gt;f&lt;/sub&gt;-MLAS Tensile Creep Tests

Maupas, H.; Chermant, Jean‐Louis

doi:10.4028/www.scientific.net/kem.132-136.1918

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“…Tensile creep studies were carried out on these composites in order to predict their lifetime under severe conditions of stress and temperature. Previous studies of creep mechanisms performed on CMCs have revealed the occurrence of a so‐called damage‐creep mechanism ( Kervadec, 1992; Kervadec & Chermant, 1993; Maupas, 1996). This mechanism implies an important matrix microcracking which is responsible for the majority of the total strain.…”

Section: Introductionmentioning

confidence: 99%

Microstructural investigations in C_f–SiC composites in as‐sintered state and after creep experiments

Vicens¹,

Boitier²,

Chermant³

1999

Journal of Microscopy

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The high interest in ceramic matrix composites during the last decade has led to a considerable number of studies devoted to their thermomechanical properties and damage processes. Despite their sensitivity to oxygen partial pressure, carbon fibres appear to possess higher stability and better mechanical properties if they are treated under protective atmospheres than other ceramic fibres (especially classical silicon carbide fibres). The aim of this investigation is to characterize at the nanoscale the main microstructural parameters of Cf-SiC composites provided by the SEP (Division of SNECMA, Bordeaux, France). This material was fabricated from a 2.5D preform made of high strength polyacrylonitrile (PAN)-based carbon fibres densified according to the chemical vapour infiltration process. A pyrocarbon (PyC) interphase was deposited on the fibre prior to the beta-SiC matrix infiltration. A careful high resolution electron microscopy (HREM) microstructural investigation focused on the fibre microstructure as well as on the different interfaces in the material: pyrocarbon/fibre and matrix/pyrocarbon interfaces. All these observations have been realized in longitudinal and transverse sections of the specimen. These observations are found in good agreement with Guigon's model for high strength ex-PAN carbon fibres. The PyC interphase texture was strongly anisotropic at the fibre/interphase and interphase/matrix interfaces over a mean thickness of 8-15 nm. Tensile creep tests were performed under partial pressure of argon between 1273 and 1673 K for stress levels ranging from 110 to 220 MPa. Scanning electron microscopy and high resolution electron microscopy were used to study the microstructural modifications inside the fibres and at the different interfaces. A discussion of the possible creep mechanisms based on the microstructural investigation and the creep results is presented.

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Section: Introductionmentioning

confidence: 99%

Microstructural investigations in C_f–SiC composites in as‐sintered state and after creep experiments

Vicens¹,

Boitier²,

Chermant³

1999

Journal of Microscopy

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2D SiC<sub>f</sub>-MLAS Tensile Creep Tests

Cited by 1 publication

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Microstructural investigations in C_f–SiC composites in as‐sintered state and after creep experiments

Microstructural investigations in C_f–SiC composites in as‐sintered state and after creep experiments

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2D SiC<sub>f</sub>-MLAS Tensile Creep Tests

Cited by 1 publication

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Microstructural investigations in Cf–SiC composites in as‐sintered state and after creep experiments

Microstructural investigations in Cf–SiC composites in as‐sintered state and after creep experiments

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Microstructural investigations in C_f–SiC composites in as‐sintered state and after creep experiments

Microstructural investigations in C_f–SiC composites in as‐sintered state and after creep experiments