Direct brazing of structural ceramics for uncooled diesels

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

OSTI ID:6350699

Moorhead, A J

We have developed a broad range of experimental filler metals that will braze structural ceramics such as MgO- and Y/sub 2/O/sub 3/-stabilized PSZ, several commercial aluminas, an experimental alumina-silicon carbide whisker reinforced composite and sintered ..cap alpha..-SiC. At least two of the alloy systems studied show promise for fulfilling the joining needs of the uncooled diesel engine. Our filler metals of composition Ag-30Cu-21Ti, and Cu-20Au-18Ti, at. %, produced ceramic-ceramic brazements that had room temperature flexural strengths greater than 100 MPa and the strengths are very respectable up to 600/sup 0/C in air. The 1000/sup 0/C brazing temperature of the Ag-30Cu-21Ti material allowed PSZ-to-nodular cast iron (NCI) brazements to be made without changing the hardness or primarily pearlitic microstructure of the cast iron. Some of the PSZ/NCI brazements had room temperature shear strengths of approx.200 MPa, but the values varied greatly, and we are presently trying to determine a reason for this lack of reproducibility.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6350699
• Report Number(s): CONF-8410103-11; ON: DE86002248
• Resource Relation: Conference: Automotive technology development contractors' coordination meeting, Dearborn, MI, USA, 29 Oct 1984
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
BRAZING ALLOYS
DIESEL ENGINES
MATERIALS
COPPER ALLOYS
FILLER METALS
MECHANICAL PROPERTIES
SILVER ALLOYS
TITANIUM ALLOYS
ALLOYS
ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties