Kanthal

Kanthal

Kanthal is a trademarked name for a family of iron-chromium-aluminium (FeCrAl) alloys used in a wide range of applications, primarily for their high resistance to oxidation and their ability to withstand high temperatures. These alloys are commonly used in heating elements for electric furnaces, kilns, and other high-temperature applications.

Composition and Properties

Kanthal alloys are composed primarily of iron, chromium, and aluminium. The typical composition includes approximately 20-30% chromium and 4-7.5% aluminium, with the remainder being iron. The presence of chromium and aluminium provides excellent resistance to oxidation and corrosion, even at high temperatures.

Key Properties

• High Melting Point: Kanthal alloys have a melting point of around 1500°C (2732°F), making them suitable for high-temperature applications.
• Oxidation Resistance: The formation of a protective aluminium oxide layer on the surface of the alloy prevents further oxidation, allowing it to maintain its integrity at elevated temperatures.
• Electrical Resistivity: Kanthal has a relatively high electrical resistivity, which makes it an ideal material for use in heating elements.
• Mechanical Strength: These alloys maintain their mechanical strength at high temperatures, which is crucial for their use in industrial applications.

Applications

Kanthal is widely used in various industries due to its unique properties. Some of the common applications include:

• Heating Elements: Used in electric furnaces, toasters, hair dryers, and other appliances that require high-temperature heating elements.
• Industrial Furnaces: Employed in the production of glass, ceramics, and steel, where high-temperature processes are essential.
• Resistors: Utilized in the manufacture of resistors for electronic devices due to its stable resistive properties.
• Laboratory Equipment: Used in laboratory furnaces and other equipment that require precise temperature control.

History

The development of Kanthal alloys dates back to the early 20th century. The name "Kanthal" is derived from the Swedish company Kanthal AB, which was founded in 1931. The company specialized in the production of resistance heating alloys and has since become a leading manufacturer in the field.

Also see

• Nichrome
• Heating element
• Electric furnace
• Oxidation
• Resistor