Control of the interfacial reactions in Nb-toughened MoSi[sub 2]

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb07769.x· OSTI ID:6082911

Shaw, L; Abbaschian, R ^[1]

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1. Univ. of Florida, Gainesville, FL (United States). Dept. of Materials Science and Engineering

Toughening of MoSi[sub 2] for high-temperature applications can be achieved by incorporating ductile refractory-metal reinforcements, provided that a coating is applied to prevent interdiffusion and reaction between the matrix and the reinforcements. In the present study, three different coating techniques for applying a thin Al[sub 2]O[sub 3] film on Nb reinforcements as a diffusion barrier have been studied. The techniques consisted of (1) sol-gel coating; (2) physical vapor deposition (PVD); (3) hot dipping in molten Al, followed by anodizing Al to form Al[sub 2]O[sub 3]. The processing parameters for the techniques were evaluated and the effectiveness of each coating as a diffusion barrier was assessed. For the present MoSi[sub 2] matrix which contains SiO[sub 2], PVD coatings provided the most effective diffusion barrier for processing MoSi[sub 2]/Nb composites.

• OSTI ID: 6082911
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:9; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COATINGS
DEPOSITION
DIFFUSION COATING
DIP COATING
ELEMENTS
FRACTURE PROPERTIES
HOT DIPPING
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
NIOBIUM
OXIDES
OXYGEN COMPOUNDS
PHYSICAL VAPOR DEPOSITION
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON COMPOUNDS
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VAPOR DEPOSITED COATINGS