Dispersed metal-toughened ceramics and ceramic brazing

Conference · Fri Dec 31 23:00:00 EST 1982

OSTI ID:6567140

Moorhead, A J; Tiegs, T N; Lauf, R J

An alumina (Al/sub 2/O/sub 3/) based material that contains approximately 1 vol % finely dispersed platinum or chromium was developed for use in high temperature thermal-shock resistant electrical insulators. The work at ORNL is divided into two areas: (1) development of DMT ceramics; and (2) development of brazing filler metals suitable for making ceramic-to-ceramic and ceramic-to-metal brazements. The DMT ceramics and brazements are intended for service at elevated temperatures and at high stress levels in the dirty environments of advanced heat engines. The development and characterization of DMT ceramics includes processing (powder preparation, densification and heat treatment) and detailed measurement of mechanical and physical properties (strength, fracture toughness, and thermal conductivity). The brazing work includes: (1) the formulation and melting of small quantities of experimental brazing filler metals; (2) evaluation of the wetting and bonding behavior of these filler metals on Al/sub 2/O/sub 3/, partially stabilized zirconia and ..cap alpha..-SiC in a sessile drop apparatus; and (3) determine the short-term strength and fracture toughness of brazements.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6567140
• Report Number(s): CONF-831142-3; ON: DE85001552
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BRAZING
CHALCOGENIDES
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
DISPERSION HARDENING
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
EQUIPMENT
FABRICATION
FILLER METALS
HARDENING
JOINING
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM ADDITIONS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
WELDING