Ta-10W alloy

Ta-10W alloy has high high temperature strength, good ductility, weldability and excellent corrosion resistance, suitable for high temperature, high pressure, corrosion resistance and other working environment, widely used in chemical industry, aerospace, atomic energy industry and high temperature technology, is a very important engineering, functional materials.

Ta10W alloy is an important member of the Ta-W alloy family. Its corrosion resistance is similar to that of tantalum, and its stability is good in acidic and neutral media. Compared with other materials, it can withstand the corrosion of high temperature and mineral acids (hydrochloric acid, nitric acid and sulfuric acid).At the same time, it has excellent thermal conductivity, the thermal conductivity is more than twice that of titanium, more than three times that of zirconium and stainless steel, and four times that of nickel-based alloy. It is an ideal material for manufacturing chemical reaction vessels, heat exchangers, and heat transfer components such as condenser, beaker heater, spiral coil, U-pipe, sprayer and reboiler, etc.

The density of Ta10W alloy is 16.78~16.90g /cm³, the melting point is up to 3080℃, has very good mechanical properties at room temperature and high temperature, at 2000℃, the tensile strength of Ta10W alloy can reach 100MPa, and has very good welding properties. The high temperature strength of Ta10W alloy is high, but the elongation rate is not more than 50%, high temperature creep resistance is good, high temperature durability is also very good, excellent properties make Ta10W alloy has a very important application in the field of aerospace.

Ta10W alloy has high chemical stability for liquid metal mercury, sodium and sodium potassium alloys, and is mainly used in the manufacture of liquid metal containers and diffusion walls of high temperature heat release elements in the atomic energy industry. In the field of space application, it is mainly used in the shell sleeve of isotope reactor (operating temperature is about 1600℃), and the heater (2000 ~ 2200℃) or high temperature chuck used in the vacuum of satellite or probe. In the field of weapons and equipment, Ta10W has been successfully applied to high-temperature resistant parts in the gun bore. The locking device surface of rocket launcher (gas temperature 3300℃, solid temperature 1800~1900℃, firing time 0.6~0.8s) adopts Ta10W powder coating, and the ballistic lever support, ignition contact and directional tube insertion mechanism all use Ta10W alloy.

The general requirements of superalloy must have two aspects of performance requirements, namely excellent high temperature mechanical properties and high temperature corrosion resistance. However, the properties of these two aspects of the same alloy are sometimes contradictory, and it is impossible to achieve optimization at the same time.Ta10W alloy has excellent high temperature mechanical properties, but the high temperature oxidation resistance in the atmosphere is relatively poor. Ta10W alloy will oxidize at 300℃, the higher the temperature, the more intense the oxidation, until the complete "powder" damage. This disadvantage limits the application range of Ta10W alloy.

At present, there are two main ways to improve the oxidation resistance of tantalum tungsten alloy at high temperature in atmosphere: alloying protection and surface coating protection. The alloying method can improve the oxidation resistance of the alloy, but the alloying element must exceed a certain critical value to protect the matrix, which is bound to affect other properties of the alloy, especially cause the decline of the mechanical properties of the matrix at high temperature, so the alloying method has its own limitations. After coating is added on the surface of the alloy, the coating can protect the alloy substrate from high temperature corrosion or slow down the corrosion rate, without changing the composition of the alloy substrate, so that the high temperature mechanical properties of the alloy can be retained to the greatest extent.