Zirconia to cast iron brazing for uncooled diesel engines
Partially stabilized zirconia has been successfully brazed to nodular cast iron by the active substrate process. The process involves coating the ceramic with an agent that promotes wetting and allows the use of commercially available ductile brazing alloys. Process details and the microstructure of zirconia-cast iron joints are described. A method of testing the shear strength of braze interfaces is outlined, and data for zirconia interfaces tested at 25 and 400/sup 0/C are presented. Joints between zirconia and cast iron or titanium develop shear strengths typically in excess of 130 MPa at 25/sup 0/C, but strength at 400/sup 0/C is lower. The reduced strength is related to porosity in the braze joints, and a means of eliminating this porosity is discussed. Preliminary observations indicate that aging at 400/sup 0/C produces no major microstructual changes in the braze joints. Also, the brazing of 115-mm-diameter discs of zirconia and cast iron, and the nondestructive examination of these brazements, is discussed.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6023013
- Report Number(s):
- CONF-8510103-7; ON: DE86008982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330700 -- Advanced Propulsion Systems-- Emission Control
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
BRAZING
CARBIDES
CARBON COMPOUNDS
CAST IRON
CERAMICS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
JOINING
JOINTS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
TITANIUM
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WELDED JOINTS
WELDING
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES