Wettability of brazing alloys on molybdenum and TZM (Mo-Ti-Zr alloy)
Vacuum brazing studies have been performed on molybdenum and TZM (0.5Ti-0.08Zr-Mo). Wettability tests have been conducted for nineteen braze metal filler alloys on molybdenum and thirty-two braze metal filler alloys on TZM over a wide range of temperatures. A wetting index, which is a function of contact angle and braze alloy contact area, was determined for each filler alloy at each brazing temperature. The nature and extent of interaction between the brazing alloys and the base metals was analyzed by conventional metallography, scanning-electron microscopy, and electron microprobe analysis. A comparison is made between the behavior of filler alloys on molybdenum and TZM -- filler alloys consistently exhibited less wettability on TZM than on molybdenum. The lower wettability of TZM is believed to be due to a small amount of titanium in the surface oxide on TZM. Cracking was observed in the base metal under some of the high temperature braze deposits. The cracking is shown to arise from liquid metal embrittlement from nickel in the high temperature braze alloys. 7 refs., 11 figs., 2 tabs.
- Research Organization:
- Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant
- DOE Contract Number:
- AC04-76DP03533
- OSTI ID:
- 5002085
- Report Number(s):
- RFP-4220; CONF-8804142-1; ON: DE88010900
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101 -- Metals & Alloys-- Preparation & Fabrication
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY-TZM
ALLOYS
BRAZING ALLOYS
CRACKS
ELEMENTS
EMBRITTLEMENT
GOLD ALLOYS
METALS
MOLYBDENUM
MOLYBDENUM ALLOYS
MOLYBDENUM BASE ALLOYS
NICKEL ALLOYS
PALLADIUM ALLOYS
PLATINUM METAL ALLOYS
SUBSTRATES
SURFACE PROPERTIES
TITANIUM ALLOYS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
WETTABILITY
ZIRCONIUM ALLOYS