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Why should titanium alloy be used for aerospace materials?
Date：
2021-11-12 10:57
1. Introduction to titanium
In 1948, the United States DuPont company used the magnesium method to produce sponge titanium in tons, ushering in the industrial production of sponge titanium, that is, titanium. Titanium alloys are widely used in various fields due to their high specific strength, good corrosion resistance, and high heat resistance.
Titanium is abundant in the earth's crust and ranks ninth, much higher than copper, zinc, tin and other base metals. Titanium is found widely in many rocks, especially sand and clay.
2. Characteristics of titanium
High strength: 1.3 times that of aluminum alloy, 1.6 times that of magnesium alloy, 3.5 times that of stainless steel, the highest among metal materials.
High thermal resistance: The operating temperature is several hundred degrees higher than that of aluminum alloy, and it can work for a long time at a temperature of 450-500 °C.
Good corrosion resistance: acid resistance, alkali resistance, atmospheric corrosion resistance, especially strong resistance to pitting corrosion and stress corrosion.
Good low temperature performance: TA7 titanium alloy with extremely low interstitial elements can maintain a certain degree of plasticity at -253°C.
High chemical activity: The chemical activity is very high at high temperature, and it is easy to chemically react with gas impurities such as hydrogen and oxygen in the air to form a hardened layer.
Small thermal conductivity and elastic modulus: the thermal conductivity is about 1/4 of nickel, 1/5 of iron, and 1/14 of aluminum, and the thermal conductivity of various titanium alloys is about 50% lower than that of titanium . The elastic modulus of titanium alloy is about half that of steel.
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