Reactive coating on alumina substrates: Calcium and barium hexa aluminates

Journal Article · Sat Oct 15 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90525-8· OSTI ID:6888234

Moya, J S; Aza, A.H. de; Steier, H P; Requena, J; Pena, P ^[1]

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1. CSIC, Madrid (Spain). Inst. de Ceramica y Vidrio

Modifying the surface of ceramics by coating with a substance different from that of the bulk is currently an important technological issue in structural as well as in functional applications (microelectric, environment, sensors, thermal and chemical barriers, catalysis, etc). About 80% of all advanced ceramics are based on alumina. In the present work the authors introduce reactive coating as a feasible route to design an appropriate surface layer in dense alumina compacts, i.e. CaO[center dot]6Al[sub 2]O[sub 3] (CA[sub 6]) and BaO[center dot]6Al[sub 2]O[sub 3] (BA[sub 6]). Doloma (CaO[center dot]MgO), calcium carbonate (CaCO[sub 3]) and barium carbonate (BaCO[sub 3]) reactive coatings on Al[sub 2]O[sub 3] substrates have been studied; the results have been discussed on the base of the high-temperature reactions predicted by the corresponding phase equilibrium diagrams.

• OSTI ID: 6888234
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 31:8; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COATINGS
BARIUM CARBONATES
SCREEN PRINTING
CALCIUM CARBONATES
CALCIUM OXIDES
MAGNESIUM OXIDES
EXPERIMENTAL DATA
PHASE DIAGRAMS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
DATA
DEPOSITION
DIAGRAMS
INFORMATION
MAGNESIUM COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SURFACE COATING
360601* - Other Materials- Preparation & Manufacture