Alumina fiber/alumina matrix composites prepared by a chemical vapor infiltration technique

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Adv. Cer. Mat.; (United States)

DOI:https://doi.org/10.1111/j.1551-2916.1986.tb00013.x· OSTI ID:5400295

Colmet, R; Lhermitte-Sebire, I; Naslain, R

Ceramic/ceramic composites made of alumina fibers embedded in an alumina matrix were obtained from fibrous alumina preforms (fiber volume = 0.12 to 0.40) using a chemical vapor infiltration technique based on gaseous alumina precursors (AlCl3-H2-CO2). Low deposition temperatures (950 to 1000 C) and total pressures (2 to 3 kPa) must be used to preferentially deposit alumina within the pores rather than on the external surface of the preform. Different fiber orientations were studied: i.e. randomly oriented short fibers and one- and two-dimensional preforms. Densification was performed down to residual open porosity of the order of 10 to 15 percent. For a one-dimensional alpha-alumina fiber composite (residual porosity about 10 percent), flexural strengths of 250 MPa and about 100 MPa were obtained at room temperature and 1200 C, respectively. Most composites exhibited brittle failure at room temperature. 20 references.

• Research Organization: SocieteEuropeenne de Propulsion, Saint-Medard-en-Jalles, France; CNRS, Laboratoire de Chimie du Solide, Talence, France
• OSTI ID: 5400295
• Journal Information: Adv. Cer. Mat.; (United States), Journal Name: Adv. Cer. Mat.; (United States) Vol. 1; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DEPOSITION
FABRICATION
FIBERS
FRACTOGRAPHY
MATERIALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SURFACE COATING