GH2907 is a Fe-Ni-Co based precipitation hardening low expansion deformation high temperature alloy, strengthened comprehensively by adding niobium, titanium, silicon, and trace boron. The following is a detailed introduction to the oxidation performance and applications of GH2907 low expansion high temperature alloy:

1. Oxidation Performance

The oxidation resistance of GH2907 high temperature alloy is relatively good, but there are certain limitations. The following is a detailed analysis of its oxidation resistance:

Oxidation temperature range: Below 650℃, the GH2907 alloy shows good oxidation resistance. However, due to the absence of chromium and aluminum, its high temperature oxidation resistance is relatively poor. When the usage temperature exceeds 700℃ and is exposed for a long time, its oxidation performance will significantly decline.

Oxidation behavior: Studies show that the oxidation kinetics curve of GH2907 alloy at 650℃ follows a parabolic law. However, as the oxidation time increases, the oxidation layer begins to break down, the degree of looseness intensifies, and the oxidation rate gradually accelerates, transitioning to a linear law.

Oxidation layer characteristics: The oxidation layer of the alloy is divided into inner and outer layers, with the outer layer being relatively loose and rich in Fe and Co elements, while the inner layer is denser and rich in Ni, Nb, and other elements. The outer layer's oxides are mainly CoFe2O4, along with some Fe3O4 and a small amount of FeO; the inner layer mainly consists of the matrix and γ phase, but contains a small amount of Fe (Co) oxides, serving as a transition layer between the oxidation layer and the matrix.

To improve the oxidation resistance of GH2907 alloy at high temperatures, appropriate protective measures can be taken, such as applying oxidation-resistant coatings.

2. Application Fields

GH2907 high temperature alloy is widely used in various fields due to its excellent performance. The following are its main application areas:

Aerospace: GH2907 alloy is one of the indispensable materials in the aerospace industry. It is used to manufacture high temperature components such as turbine discs, turbine blades, and combustion chambers for aircraft engines and gas turbines. These components require materials with high strength, high heat resistance, and excellent oxidation resistance to ensure stable operation of the engine under high temperature, high speed, and high pressure conditions.

Energy: In the energy sector, GH2907 alloy is used to manufacture high temperature and high pressure equipment components in petroleum refining and the power industry. These devices need to operate for long periods in high temperature, high pressure, and corrosive environments, thus requiring materials with good high temperature resistance, corrosion resistance, and creep resistance.

Chemical Industry: In the chemical industry, GH2907 alloy is widely used in various chemical medium processing equipment. Due to its excellent corrosion resistance, it is suitable for handling various corrosive gases, effectively extending the service life of the equipment.

Other Fields: Additionally, GH2907 alloy is also used to manufacture key components such as glass melting furnaces and high temperature metal heat treatment equipment. In these applications, materials need to withstand the tests of high temperature, high pressure, and corrosive environments, making GH2907 alloy an ideal choice due to its outstanding performance.

In summary, GH2907 low expansion high temperature alloy, with its excellent high temperature stability, oxidation resistance, and wide range of applications, has become one of the indispensable materials in today's high-end industrial fields. With technological advancements and the continuous expansion of industrial demands, GH2907 alloy will continue to play an important role in the future, promoting the industry towards higher temperatures and more extreme environments.