Direct brazing of structural ceramics for uncooled diesels
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
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
BRAZING ALLOYS
CERAMICS
COPPER ALLOYS
DIESEL ENGINES
ENGINES
FILLER METALS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MATERIALS
MECHANICAL PROPERTIES
SILVER ALLOYS
TITANIUM ALLOYS