Slow crack growth in SiC platelet reinforced Al{sub 2}O{sub 3} composite

Journal Article · Wed May 15 00:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00026-7· OSTI ID:247984

Belmonte, M; Moya, J S; Miranzo, P ^[1]; Nguyen, D; Fantozzi, G ^[2]

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1. C.S.I.C., Madrid (Spain). Inst. de Ceramica y Vidrio
2. INSA de Lyon, Villeurbanne (France)

Ceramic matrix composites with enhanced toughness are at present projected for many structural applications such as high temperature components in gas turbine, structures for hypersonic aircraft and bioprosthetic devices. The incorporation of a SiC dispersed second phase in form of whisker or platelets into an alumina matrix has allowed to improve material toughness, thermal shock resistance and R-curve behavior. Recently, considerable interest in the acquisition of slow crack growth (SCG) data for ceramic materials has arisen in order to predict the service lifetime of brittle components. Non-oxide ceramics such as SiC and Si{sub 3}N{sub 4} are extremely resistant to crack growth at low temperatures, whereas oxide ceramics are susceptible to stress corrosion because of the chemical interaction between water and stressed cracks. Up to date, there are not many papers devoted to SCG of SiC whiskers reinforced Al{sub 2}O{sub 3} composites and none about SiC platelets used as reinforcement. The objective of the present work has been to evaluate the slow crack growth in a Al{sub 2}O{sub 3}/SiC-platelet composite by double torsion testing analysis. The results will be compared with those obtained for SiC whisker reinforced Al{sub 2}O{sub 3} composite tested using the same conditions.

• OSTI ID: 247984
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
FRACTURE MECHANICS
FRACTURE PROPERTIES
GAS TURBINES
SERVICE LIFE
SILICON CARBIDES
STRESS CORROSION
STRESS INTENSITY FACTORS
TORSION
VELOCITY