INVESTIGATION OF INTERMETALLIC COMPOUNDS FOR VERY HIGH TEMPERATURE APPLICATIONS

Technical Report · Sun Jul 01 04:00:00 EDT 1962

OSTI ID:4781857

Booker, J; Paine, R M; Stonehouse, A J

Three differert areas were studied in a continuing investigation of intermetallic beryllides and silicides for very high-temperature applications. The measured properties of Ta/sub 2/Be/sub 17/ were unaffected by minor variations in stoichiometry between 800 and 3000 deg F, whereas best results for WSi/sub 2/ were obteined with a material slightiy deficient in tungsten. WSi/sub 2/ exhibited poorest oxidation resistance at 2200 deg F. Results are reponted for oxidation-rate studies on TaBe/sub 12/, TaBe/sub 17/, ZrBe/sub 13/, and Zr/sub 2/ Be/sub 17/ in the tempera ture range from 2300 to 2750 deg F. The vapor pressures for these same compounds were measured between 2300 and 2850 deg F using the Knudsen cell technique. For TaBe/sub 12/ the activation energy for oxidation is lower than the vaporization energy in this temperature range. The oxidation products of Zr/sub 2/Be/sub 17/ were found to be ZrBe/sub 5/ and BeO. Ternary systems of berylliurn and silicon with molybdenum, niobium, tantalum, tungsten, or zirconium were studied. The most promising material from these studies was a mixed-phase preparation with the stoichiometry of MoBeSi. This material exhibited less than 2 mils penetration when oxidized in air at 3000 deg F for 10 hours. (auth)

• Research Organization: Brush Beryllium Co., Cleveland
• NSA Number: NSA-17-000543
• OSTI ID: 4781857
• Report Number(s): WADD-TR-60-889(Pt.II)
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIDES
BERYLLIUM ALLOYS
ENERGY
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
OXIDATION
PRESSURE
REACTION KINETICS
SILICIDES
TANTALUM ALLOYS
TUNGSTEN ALLOYS
USES
VAPORS
ZIRCONIUM ALLOYS