2.5.4.2 Concentrator This system is identical to that for the Brayton cycle. 2.5.4.3 Heat Absorber It was assumed that 50% of this component would require non-lunar materials. Some possible materials for high temperature parts of this component are Croloy(2.25% Cr- 1% Mo), steel alloys such as (25% Cr - 12% Ni) or (25% Cr - 20% Ni), or nickel alloys such as Rene 41 (10% Co, 10% Mo, .005% B plus Ni, Al, Ti, Fe).
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