Indirect brazing of structural ceramics for uncooled diesels

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6063981

Hammond, P P; David, S A; Woodhouse, J J

An important technological advance was made recently when processes were demonstrated for brazing partially stabilized zirconia (PSZ) to nodular cast iron (NCI) at a temperature sufficiently low (735/sup 0/C) as not to degrade the properties of NCI. This advance was enabled by a new process, termed the active substrate process, rather than by the usual active filler metal approach. The brazing is performed in vacuum and utilizes treatment of the ceramic surface with an active agent to trigger wetting and strong bonding, in conjunction with a ductile, low-melting filler metal. The cast iron is specially treated to enable the filler metal to braze to it. Single-cycle (one-stage) processes are detailed for joining PSZ to NCI with a titanium transition piece (TP) to minimize strain on the ceramic and also without the TP. Preliminary data are presented on shear strength at the braze interfaces and on resistance to thermal shock and thermal cycling of 2.5-cm dia demonstration joints.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6063981
• Report Number(s): CONF-8410103-10; ON: DE85005569
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102 -- Internal Combustion Engines-- Diesel
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
BRAZING
CERAMICS
CHALCOGENIDES
DIESEL ENGINES
ELEMENTS
ENGINES
FABRICATION
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
IRON
JOINING
MECHANICAL PROPERTIES
METALS
OXIDES
OXYGEN COMPOUNDS
SHEAR PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WELDING
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES