DEVELOPMENT OF ULTRA REFRACTORY MATERIALS. Summary Report for November 1, 1958 through October 31, 1959

Technical Report · Sun Nov 01 04:00:00 EST 1959

OSTI ID:4147349

Shaffer, P T.B.

An investigatton was made of refractory systems from which may- be developed new oxidation-resistant, superrefractory materials. An oxidation furnace was operated for a short period at 3860 deg F, and continuously at 3540 deg F. A dilatometer, designed to protect the sample in an inert atmosphere was assembled, and after preliminary- testing showed promise for use with oxidizable materials. A furnace for measuring modulus of rupture in inert atmospheres up to 3630 deg F was constructed. The pressurizable micro furnace for melting point and similar tests has been operated at 3990 deg F and 1000 psi. However, when operated under these condittons, over-heating of the upper shell occurred. Additional insulation or water-cooling will be installed. Two pieces of equipment, one to measure impact strength at temperatures up to =30 deg F and the other to measure tensile strength at temperatures in excess of 3630 deg F are under construction. A dilatometer for use to approximately 5430 deg F is being designed. Hot-pressed composite bodies of zircon and zirconium diboride have been formed and have been shown to have excellent oxidation resistance and thermal shock resistance up to 3180 deg F. Composite bodies of zirconium diboride ivith either pentaztrconium trisilicide or niolvbdenum disilicide have excellent oxidation resistance up to 3540 deg F. A relatively impure grade of zirconium diboride, prepared from zircon bv means of a one-step process, has been shown to have better oxidation resistance than the very- pure zirconium diboride hitherto studied. (auth)

• Research Organization: Carborundum Co. Research and Development Div., Niagara Falls, N.Y.
• NSA Number: NSA-14-011963
• OSTI ID: 4147349
• Report Number(s): AD-228359
• Country of Publication: United States
• Language: English

Related Subjects

COOLING
EFFICIENCY
EXPANSION
FAILURES
FURNACES
HOT WORKING
IMPACT SHOCK
IMPURITIES
INERT GASES
INSTRUMENTS
MACHINE PARTS
MATERIALS TESTING
MEASURED VALUES
MELTING POINTS
METALS, CERAMICS, AND MATERIALS
MOLYBDENUM COMPOUNDS
OXIDATION
PLANNING
PRESSURE
REFRACTORIES
SAMPLING
SHELLS
SILICIDES
STABILITY
TENSILE PROPERTIES
THERMAL INSULATION
THERMAL STRESSES
WATER
ZIRCONIUM BORIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES