Titanium and titanium alloys have two excellent characteristics: high specific strength and excellent corrosion resistance. This is also the reason why titanium alloys are preferred for the aerospace industry, chemical industry, medical engineering and leisure industries.
Specific strength and high temperature performance:
The density of metals varies greatly. Lithium had the lowest density at 0.5g/cm-3, while osmium and iridium had the highest density at 22.5g /cm-3. The density of 5g/ Cm-3 is the boundary point between light metals and heavy metals, so titanium with a density of 4.51g /cm-3 is the heaviest light metal. Although titanium is twice as dense as aluminium, a typical light metal, it is only about half as dense as iron or nickel
The specific strength of CFRP is higher than that of titanium alloy only under 300℃. The specific strength of titanium alloys is particularly good at higher temperatures. However, the maximum operating temperature of titanium is limited by its oxidation characteristics. Because ti-Al compounds can partially overcome this shortcoming, they have become the focus of alloy development. Conventional high-temperature titanium alloys can only be used at temperatures slightly above 500℃, but ti-Al alloys can be directly comparable with mature high-temperature steel and nickel-based superalloys
Titanium and titanium alloys have good corrosion resistance. Titanium and titanium alloys have long-term corrosion resistance in oxidizing atmosphere, and the presence of a small amount of oxygen and water is enough to form a protective oxide film.
Adding inert metals (often palladium and ruthenium), nickel and molybdenum, or using corrosion inhibitors in machines can improve titanium's resistance to corrosion. Extensive corrosion databases provide information on the corrosion behavior of specific alloys in different medium.
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