Какви са ползите от титанова сплав?
Titanium alloy features:
High strength: The density of titanium alloy is generally about 4.51g/cm3, which is only 60% of steel. The strength of pure titanium is close to that of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is much greater than that of other metal structural materials, and parts and components with high unit strength, good rigidity and light weight can be produced. At present, titanium alloys are used in engine components, skeletons, skins, fasteners and landing gears of aircraft.
High thermal strength: the use temperature is several hundred degrees higher than that of aluminum alloy, and it can still maintain the required strength at medium temperature, and can work for a long time at a temperature of 450-500 °C. Titanium alloy still has high specific strength in the range of 150°C to 500°C, while the specific strength of aluminum alloy decreases significantly at 150°C. The working temperature of titanium alloy can reach 500°C, while that of aluminum alloy is below 200°C.
Good corrosion resistance: Titanium alloy works in humid atmosphere and seawater medium, and its corrosion resistance is far superior to stainless steel; it has particularly strong resistance to pitting corrosion, acid corrosion, and stress corrosion; it is resistant to organic substances such as alkali, chloride, and chlorine. Articles, nitric acid, sulfuric acid, etc. have excellent corrosion resistance. However, titanium has poor corrosion resistance to media with reducing oxygen and chromium salts.
Good performance at low temperature: Titanium alloy can still maintain its mechanical properties at low and ultra-low temperatures. Titanium alloys with good low-temperature performance and extremely low interstitial elements, such as TA7, can maintain certain plasticity at -253°C. Therefore, titanium alloy is also an important low-temperature structural material.
High chemical activity: Titanium has high chemical activity and has a strong chemical reaction with O, N, H, CO, CO2, water vapor, ammonia, etc. in the atmosphere. When the carbon content is greater than 0.2%, hard TiC will be formed in the titanium alloy; when the temperature is high, the interaction with N will also form a hard surface layer of TiN titanium alloy products; when the temperature is above 600 ° C, titanium absorbs oxygen to form a high hardness The hardened layer; the hydrogen content rises, and an embrittled layer will also be formed. The depth of the hard and brittle surface layer produced by absorbing gas can reach 0.1-0.15 mm, and the degree of hardening is 20%-30%. The chemical affinity of titanium is also large, and it is easy to cause adhesion with the friction surface.
