The reaction of titanium alloy materials such as Titanium Bar and titanium tubes in air is usually reacted with three non-metallic elements such as oxygen, nitrogen and hydrogen, and their reaction processes are closely related to temperature. Titanium reacts with oxygen in air and is very slow below 100°C. At 500°C only the surface is oxidized. As the temperature increases, the surface oxide film begins to dissolve in the titanium, and oxygen begins to diffuse into the metal interior, but at 700°C, oxygen does not enter the metal internal lattice. When it exceeds 700°C, the diffusion of oxygen into the interior of the metal accelerates, and the surface oxide film loses its protective effect at a high temperature. So what is the specific relationship? Titanium Rod Supplier will come to tell you.
The reaction of titanium with oxygen depends on the form and temperature at which titanium is present. Powdered titanium in the air at normal temperature can be violently burned or exploded due to static electricity, sparks, friction, and the like. However, dense titanium is very stable in air at normal temperature. When dense titanium is heated in the air, it begins to react with oxygen. Initially, oxygen enters the lattice of titanium surface to form a dense oxide film. This surface oxide film prevents oxygen from diffusing into the interior and has a protective effect. It is stable in air below 500°C. The color of the surface oxide film is related to the formation temperature, which is silvery white at 200°C, yellowish at 300°C, golden yellow at 400°C, blue at 500°C, purple at 600°C, and 700 to 800°C. It is reddish gray and gray at 800-900°C. In pure oxygen, the initial temperature at which titanium reacts violently with oxygen is lower than in air, and titanium burns in oxygen at about 500 to 600°C.
Titanium does not react with nitrogen at normal temperature, but at high temperatures, titanium is one of the few metal elements that can be burned in nitrogen. The combustion temperature of titanium in nitrogen is higher than 800 degrees. The reaction between molten titanium and nitrogen is very intense. The reaction of titanium with nitrogen forms a Ti-N solid solution in addition to titanium nitride (Ti3N, TiN, etc.). When the temperature is between 500 and 550 degrees, titanium begins to absorb nitrogen significantly, forming a gap solid solution; when the temperature reaches 600 degrees or higher, the rate of nitrogen absorption by titanium increases. In the Ti-N solid solution, nitrogen enters as titanium nitride. In the titanium lattice, the temperature of the titanium phase transition is increased, and nitrogen is also a stabilizer for titanium. At 1050 degrees, the maximum solubility (mass fraction) of nitrogen is 7%, and the maximum solubility (mass fraction) in titanium is 2% at 2020, but the rate of nitrogen uptake by titanium is much slower than that of oxygen. Therefore, titanium is mainly oxygen in the air, and nitrogen absorption is secondary.
Titanium reacts with hydrogen to form TiH, TiH2 compounds and Ti-H solid solutions. Hydrogen is well soluble in titanium, and 1 mol of titanium can absorb almost 2 mol of hydrogen. Titanium hydrogen absorption rate and hydrogen absorption amount are related to temperature and hydrogen pressure. The hydrogen absorption of titanium at room temperature is less than 0.002%. When the temperature reaches 300 degrees, the hydrogen absorption rate of titanium increases; when it reaches 500 to 600 degrees, it reaches the maximum value. Thereafter, as the temperature increases, the amount of hydrogen absorbed by the titanium decreases, and when it reaches 1000 degrees, most of the hydrogen absorbed by the titanium is decomposed. The increase of hydrogen pressure can accelerate the absorption of hydrogen by titanium and increase the hydrogen absorption. On the contrary, the dehydrogenation of titanium can be achieved under the condition of reducing the pressure. Therefore the reaction of titanium with hydrogen is reversible. Titanium reacts with hydrogen to form no film on the surface. Because of the small volume of hydrogen atoms, it can quickly diffuse into the deep lattice of titanium to form a gap solid solution. The dissolution of hydrogen in titanium can lower the temperature of titanium phase transformation. Hydrogen is Ti. stabilizer.
The above is the relationship between the reaction state of titanium alloy in air and temperature. If you are interested in titanium alloy products, you can contact us. Our company produces titanium rods, titanium plates and Titanium Wire, which can meet your needs.
Next: Titanium Application