What is titanium alloy? What are the properties?

Titanium is an important structural metal developed in the 1950s, titanium alloys of high strength, good corrosion resistance, high heat resistance. 1950s to 1960s, mainly the development of high-temperature titanium alloys for aero-engines and structural titanium alloys for airframes.

Characteristics:

1, first of all, surely titanium targets can be made in many colors, such as titanium gray, gunmetal gray, black, imitation gold, coffee, blue, purple and so on and so on.

2, the second titanium adhesion is very good, for ceramic and glass substrate also has a very good adhesion, so titanium can be used for poor adhesion of the film material of the base film material. Titanium can also be used as a film resistor or film capacitor production materials.

3, titanium adsorption of active gases is very strong, evaporated on the mercury wall of the fresh Ti film to form a high adsorption capacity of the surface, has an excellent gas absorption properties, almost all gases in addition to inert gases and chemical reaction. This property makes Ti in the ultra-high vacuum pumping system as a suction agent and get a wide range of applications, such as used in titanium sublimation pumps, sputtering ion pumps, etc..

4, corrosion resistance, titanium is a very active metal, its equilibrium potential is very low, in the medium of thermodynamic corrosion tendency. But in fact, titanium is very stable in many media, such as titanium in oxidizing, neutral and weakly reducing medium is corrosion resistant.

Expanded Information:

Titanium alloys are alloys composed of titanium with the addition of other elements. Titanium has two kinds of homogeneous heterocrystals: α-titanium with dense hexagonal structure below 882°C, and β-titanium with body-centered cubic above 882°C.

Oxygen, nitrogen, carbon and hydrogen are the main impurities in titanium alloys. Oxygen and nitrogen in the α-phase has a greater solubility, titanium alloy has a significant strengthening effect, but the plasticity is reduced. Oxygen and nitrogen content in titanium are usually specified in 0.15-0.2% and 0.04-0.05% respectively.

Hydrogen in the α-phase solubility is very small, titanium alloys dissolved in excess of hydrogen will produce hydride, making the alloy brittle. Normally, the hydrogen content in titanium alloys is controlled to be less than 0.015%. The dissolution of hydrogen in titanium is reversible and can be removed by vacuum annealing.

Titanium alloy in the humid atmosphere and seawater media work, its corrosion resistance is far better than stainless steel; pitting, acid corrosion, stress corrosion resistance is particularly strong; alkali, chloride, chlorine, organic items, nitric acid, sulfuric acid, etc. have excellent corrosion resistance. But titanium has a reducing oxygen and chromium salt media corrosion resistance is poor.

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