Bolting alloy fills high-temperature gap
- SPS Technologies Inc., Jenkintown, PA (United States)
A high-strength, high-temperature fastener alloy has been developed by SPS Technologies to meet the requirements of today`s advanced turbine engines. Designated Aerex 350, it is based on the multiphase materials cobalt, nickel, and molybdenum to take advantage of their low notch sensitivity, high strength, and excellent resistance to creep and corrosion. In choosing the chemical composition of Aerex 350 Alloy (25Co, 17Cr, 3Mo, 2Ti, 1Al, 1Nb, 4Ta, 2W, balance Ni), researchers sought to produce physical properties equivalent to those of conventional nickel-base superalloys such as Waspaloy. As a result, thermal expansion coefficient, thermal conductivity, electrical resistivity, specific heat, enthalpy, modulus, Poisson`s ratio, and density are all in the ranges common to that class. Perhaps the most important of these is its coefficient of thermal expansion, which ranges from 13.5 {mu}m/m{degree}C at 425 C to 14.8 {mu}m/m{degree}C at 700 C. A bolt with a higher coefficient of expansion than the joint material would be detrimental because clamp load can be reduced significantly as the assembly heats up. Therefore, the expansion characteristics of Aerex 350 Alloy ensure joint integrity up to the highest operating temperatures.
- OSTI ID:
- 32073
- Journal Information:
- Advanced Materials and Processes, Vol. 147, Issue 2; Other Information: PBD: Feb 1995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
HEAT RESISTING ALLOYS
RESEARCH PROGRAMS
GAS TURBINE ENGINES
FASTENERS
CORROSION RESISTANCE
CHEMICAL COMPOSITION
PERFORMANCE
COBALT ALLOYS
CHROMIUM ALLOYS
MOLYBDENUM ALLOYS
TITANIUM ALLOYS
ALUMINIUM ALLOYS
NIOBIUM ALLOYS
TANTALUM ALLOYS
TUNGSTEN ALLOYS
NICKEL ALLOYS
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
MICROSTRUCTURE