Refractory Metals in Space Electric Power Conversion Systems

Semmel, J. W.

doi:10.1007/978-1-4684-9120-3_8

Cited by 5 publications

(1 citation statement)

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“…To reach service temperatures of up to 1773 K, candidate materials should be based on refractory metals such as Nb, Mo, W and Ta, as they have melting points over 2700 K. However, the alloys based on such refractory metals have one major drawback: extremely poor oxidation resistance at elevated temperatures. 1,2) Recently, refractory metal aluminides and silicides have attracted substantial interest, since they exhibit better stiffness, density, high temperature strength and oxidation resistance than the major constituents alone. Many refractory metal aluminides and silicides in monolithic form, however, exhibit extremely low damage tolerance at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Solidification Process and Mechanical Behavior of the Nb/Nb5Si3 Two Phase Alloys in the Nb-Ti-Si System

et al. 2004

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Design of two-phase alloys consisting of niobium solid solution (A2) and -Nb 5 Si 3 (D8 l ) phases in the Nb-Ti-Si ternary system is pursued for ultra-high temperature structural applications. Compositional and annealing conditions are determined for the formation of A2/D8 l lamellar microstructure via eutectoid decomposition of Nb 3 Si (tP32) phase in the Nb-Si binary and Nb-Ti-Si ternary system. Addition of titanium is found to result in increased room temperature toughness, but decreased high temperature strength. Enhancement of mechanical properties is achieved by applying the directional solidification technique. Mechanical properties of the alloys are discussed from microstructural point of view.

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Section: Introductionmentioning

confidence: 99%