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Simple and modified silicide coatings were developed on two tantalum-base alloys -- Ta-30Cb-7.5V and 90Ta-10W -- by pack cementation techniques, using single and double cycle processes. The unmodified silicide coating on the Ta-20Cb-7.5V alloy in a silicon weight of 25.2 mg/cm2 protected the substrate from oxidation for over 100 hours at 1800 F and over 40 hours at 2700 F. All pack modifiers (Ti, V, W, Mo) decreased the oxidation resistance of the silicide coating on this alloy. On the 90Ta-10W alloy, only heavy modification of the substrate in two-cycle processes (modifier first and silicon second) was capable of affording significant protection to the substrate. Effective modification required the deposition of 15 to 30 mg/cm2 of Ti, Ti-W, Ti-Mo, or Ti-Cr prior to the deposition of silicon. The longest oxidation life of a modified silicide on the 90Ta-10W alloy at 2700 F was 50 hours, and was obtained from a pure titanium pack modifier with a titanium deposit weight of 26.0 mg/cm2. The pure titanium pack provided severe sintering problems and a 90 volume percent titanium - 10 volume percent tungsten (67.8 weight percent titanium - 32.2 weight percent tungsten) prealloyed pack was used which minimized sintering and provided only slightly inferior high-temperature oxidation resistance. The low-temperature oxidation resistance (1800 F) of the coated 90Ta-10W alloy was only fair, ranging up to 50 hours for the Ti-W modified coating. The highest 1-hour use temperature for the coated 90Ta-10W alloy is 2000F. Bend tests, room temperature and 2600 F tensile tests, and 2600 F creep tests on the 90Ta-10W alloy coated with the (Ti-W)-Si coating showed almost no loss in properties as a result of the coating processes.