C-103 (Nb-10Hf-1Ti) alloy is a sort of low-strength niobium alloy with accurate high-temperature strength, extremely good formability and welding performance, which is broadly used in rocket propulsion and different fields, and is a variety of niobium alloy with a huge vary of applications. Our united states of america imitates this alloy utilized in two-component liquid rocket engine, and adopts niobium silicide high-temperature anti-oxidation safety coating, the working temperature can attain 1200~1300 ℃.
Good forming residences and secure reliability make C-103 niobium alloy has exquisite value performance, and in addition promote its utility in the aerospace field.
Due to the boundaries of working temperature and excessive temperature mechanical properties, C-103 alloy and niobium silicide anti-oxidation coatings have been challenging to meet the evolving wants of spacecraft. For this reason, China has developed Nb521 (Nb-5W-2Mo-1Zr) niobium alloy on the groundwork of Soviet 5ΒΜЦ niobium alloy. The alloy is lined with molybdenum silicide for high-temperature safety in opposition to oxidation, which will increase the running temperature to round 1550 °C, extensively lowering the drift of propellant used to cool the combustion chamber, therefore correctly growing the particular impulse of the engine.
Nb521 niobium alloy is in the niobium matrix through including W, Mo, Zr alloying factors and a small quantity of C elements, strong answer strengthening and precipitation strengthening aggregate of niobium alloys to similarly enhance the room temperature and excessive temperature mechanical houses of niobium alloys, is a sort of medium-strength plastic niobium alloy. Nb521 excessive temperature mechanical residences are a good deal greater than the C-103 alloy, the energy of its 1600 ℃ is three ~ four instances that of the C-103 alloy, and has been efficaciously utilized to a range of applications. Nb521 niobium alloy has a excessive temperature mechanical property tons greater than C-103 alloy, and its energy at 1600 ℃ is 3~4 instances greater than C-103 alloy.
Nb521 niobium alloy has excellent room-temperature forming performance, generally can be used plate spinning training of uniform transition nozzle extension, however most of the nozzle is acquired with the aid of machining the bar, machining concern and cloth utilisation is tremendously low.
In addition, the molybdenum silicide high-temperature antioxidant coating organized in Nb521 alloy cloth has positive self-healing ability, and the coefficient of linear enlargement of the alloy fabric is shut to that of Nb521 alloy material, so it has accurate antioxidant safety and bonding performance.
