SOME STUDIES OF THE INTERACTION OF COBALT AND NICKEL WITH TITANIUM DIBORIDE. Report No. 81

Technical Report · Tue Apr 01 04:00:00 EST 1958

OSTI ID:4321359

Willmore, T A; Bennett, D G

When combinations of cobalt and titanium diboride are heated in the temperature range 1600 to 2750 deg F, chemicai reaction occurs to produce titanium monoboride and cobalt boride. The observed tendency for cobalt and titanium diboride to persist is interpreted as a function of the ratios of these reacting constituents. Melting was detectable at temperatures as low as 2000 deg F and, for compacts containing 95 weight per cent cobalt-5 weight per cent titanium diboride, melting was essentally complete at approximately 200 deg F below the melting point of cobalt. Due to the number of phases formed, the mechanism of melting is probably not a simple process. It was established that boron is essential to produce low melting effects by substituting titanium for titanium diboride on a titanium-equivalent basis. Compacts of nickel and titanium diboride yielded results which closely paralleled those obtained with cobalt and titanium diboride. Their melting characteristics, however, indicated that the slope of the liquidus is probably less steep than in the cobalt system. In both systems, a prevalent tendency for melt and solid fractions to separate makes it difficult to maintain homogeneous samples. Hence, equilibrium is difficult to establish. (auth)

• Research Organization: Illinois. Univ., Urbana
• NSA Number: NSA-12-012971
• OSTI ID: 4321359
• Report Number(s): AFOSR-TN-58-515; AD-158326
• Country of Publication: United States
• Language: English

Related Subjects

CHEMICAL REACTIONS
CHEMISTRY
COBALT
COBALT BORIDES
HEATING
HIGH TEMPERATURE
MELTING
MELTING POINTS
NICKEL
NICKEL BORIDES
QUANTITY RATIO
TEMPERATURE
TESTING
TITANIUM
TITANIUM BORIDES