Introduction
High temperature alloys refer to metal materials designed and manufacturedusing the principle of thermodynamics, thermochemistry and thermomechanics to work in harsh conditions.These alloys are usually tailor-made depending on the metal and alloy composition and the requirements of application such as creep resistance and corrosion. High temperature alloys usually consist of different types of metals such as Nickel, Cobalt or Iron.
Types of High Temperature Alloys
The two basic types of high temperature alloys are Nickel-based and Iron-based alloys.
Nickel-based Alloys
Nickel-based alloys are the most common type of high temperature alloys and are used in a wide range of applications such as aerospace, chemical processing and petrochemical plants. Common nickel-based high temperature alloys include Hastelloy, Inconel, Monel and Nimonic. These alloys are highly corrosion resistant, have excellent strength and are highly resistant to oxidation and embrittlement at high temperatures.
Iron-based Alloys
Iron-based alloys are used for similar applications as nickel-based alloys, but tend to be slightly less expensive. Common iron-based high temperature alloys include AISI 410, AISI 430 and AISI 431. These alloys are commonly used in applications where moderate corrosion resistance is needed, such as chemical processing and petrochemical plants.
High Temperature Alloy Properties
High temperature alloys possess unique mechanical and physical properties that make them suitable for use in applications requiring harsh environmental conditions. Common properties of high temperature alloys include:
• High melting point
High temperature alloys possess a much higher melting point than other metals and alloys due to their composition, allowing them to remain strong and durable even at extremely high temperatures.
• Corrosion resistance
High temperature alloys are highly resistant to corrosion and can withstand harsh chemical environments. This makes them ideal for use in chemical processing and petrochemical plants.
• High strength
High temperature alloys are usually much stronger than other metals and alloys, making them suitable for applications requiring high strength and durability.
• Creep resistance
High temperature alloys possess excellent creep resistance, meaning that their strength will not degrade over time even at very high temperatures.
• Thermal and electrical conductivity
High temperature alloys possess good thermal and electrical conductivity, making them suitable for use in electrical equipment and electronics.
Conclusion
High temperature alloys are a special type of metal materials designed to be used in extreme environmental conditions. Nickel-based and iron-based alloys are the two main types of high temperature alloys. These alloys possess unique properties such as high melting point, corrosion resistance, high strength, creep resistance and good thermal and electrical conductivity. They are highly sought after for use in extreme conditions such as aerospace and chemical processing applications.
