INVESTIGATION OF DIFFUSION BARRIERS FOR REFRACTORY METALS. Progress Report No. 9, October 15, 1961-January 15, 1962
Evaluation of the Mo -Rh, Mo -W, and W -Rh combinations for interdiffusion at 1700 deg C was completed. The WRe, W-Ru, W-Ir, W-Rh, and Ta - Ir base-barrier combinations as well as the Re-Rh and Ir-Rh barrier-coating combinations were evaluated for interdiffusion at 1800 deg C. Interdiffusion experiments at both temperatures indicated that the relative extent of interdiffusion in the promising combinations increases in the following orders: W- Os, W-Re, W -Ir, W-Ru, and W-Rh for W-base combinations; and Ta-Re, Ta-Os, Ta-Ru, and Ta-Ir for Ta-base combinations. The relative extent of interdiffusion appears to increase approximately with decreasing barrier melting point. The combinations selected as optimum now consist of the following: W -Re, W -Ru, W - Ir, Mo -W, Mo -Re, Mo -V, Ta-W, Ta-Re, Ta-Os, Ta-Ru, Cb -W, Cb -Re, Cb -Os, and Cb -Zr. Investigations of intermediate phase growth kinetics were started for W- Re. (auth)
- Research Organization:
- Manufacturing Labs., Inc., Cambridge, Mass.
- NSA Number:
- NSA-16-009207
- OSTI ID:
- 4798006
- Report Number(s):
- NP-11348
- Country of Publication:
- United States
- Language:
- English
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